CN100565102C - Electrolevel - Google Patents
Electrolevel Download PDFInfo
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- CN100565102C CN100565102C CNB2005101250607A CN200510125060A CN100565102C CN 100565102 C CN100565102 C CN 100565102C CN B2005101250607 A CNB2005101250607 A CN B2005101250607A CN 200510125060 A CN200510125060 A CN 200510125060A CN 100565102 C CN100565102 C CN 100565102C
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Abstract
The present invention relates to electrolevel and used scale thereof, relate in particular to and a kind of the scale collection of illustrative plates is looked like to be transformed to electric signal, and this signal is made Fourier transform, the electrolevel of realize focusing control and abnormal detection function.Said scale with the 1st, the 2nd collection of illustrative plates and the 3rd collection of illustrative plates that needs sometimes along surveying the length direction spaced sequence, the 1st, different with the wide variety cycle of the 2nd collection of illustrative plates, the 3rd collection of illustrative plates is then wide.Above-mentioned level meter is made the next light of photoelectric transformer receiving telescope optical system and collection of illustrative plates is transformed to electric signal, after signal processing part is made Fourier transform to this signal, focuses and controls and detect unusually.
Description
The application is that the application number submitted on Dec 22nd, 1993 is dividing an application of 01137724.0 patented claim.
Technical field
The electrolevel scale that the present invention relates to electrolevel and use, particularly relate to and the collection of illustrative plates picture of scale can be transformed to electric signal by photoelectric transformer, resulting electric signal is carried out Fourier transform, to carry out the electrolevel and the electrolevel scale of focusing control and abnormality detection etc.
Background technology
When carrying out direct horizontal survey etc., level meter (spirit-leveling instrument) and scale have been used in the past.That is, the gauger utilizes the scale of the visual scale of level meter to measure high low head.This reading error that produces the gauger by means of the measurement of old-fashioned level meter.In order to eliminate this reading error, developed the electrolevel that carries out the scale label operation in the electronics mode.The example of structure of this electrolevel is, sends the light that comprises specified signal from scale one side, receives and discerns this light at electrolevel one side joint, reads the scale of scale again.
Although now image processing techniques is very advanced, but by multiplying power is carried out Flame Image Process with the scale label of variable in distance, read scale label in the electronics mode, but problem is to need a large amount of processing times, lacks practicality.
Summary of the invention
Therefore, develop the 1st embodiment of the present invention and the 2nd embodiment, promptly the multiplying power of scale label also can be used easy signal Processing with variable in distance, reads the electrolevel of scale label in the electronics mode.
The electrolevel of this 1st embodiment and the 2nd embodiment can automatically be obtained high low head, but the collection of illustrative plates picture of scale is overlapped with focus, and this focusing operation need manually be carried out.Along with the progress of Autofocus Technology in recent years, the focusing operation enters robotization, but generally adopts triangulation.The automatic focusing control of this triangulation exists to be needed to adopt nonshared control unit, thus the problem that causes cost to rise.
And the electrolevel of the 1st embodiment and the 2nd embodiment is because the focusing operation is manual, so existence causes the possibility problem of higher of mensuration mistake because of scale aim bias and scale focus deviation.
The electrolevel of first aspect present invention, it is characterized in that, be used for measuring automatically the high low head of the described scale of scale starting point distance with the intersection point of described electrolevel boresight, described scale has the modulation collection of illustrative plates of alternately arranging in the length direction equal intervals of described scale, and its formation of described electrolevel comprises:
Comprise focus optical system in interior telescopic optical system, be used for above-mentioned collection of illustrative plates imaging;
With the image transformation of described modulation collection of illustrative plates is the photoelectric transformer of electric signal;
Make described collection of illustrative plates be imaged on the focusing portion on the described photoelectric transformer with adjustable way;
Described electric signal is carried out the signal processing part of Fourier transform;
The focusing control part that the output level that responds described Fourier transform is controlled described focusing portion.
The electrolevel of second aspect present invention, it is characterized in that, be used for measuring automatically the high low head of the described scale of scale starting point distance with the intersection point of described electrolevel boresight, described scale has the modulation collection of illustrative plates of alternately arranging in the length direction equal intervals of described scale, and its formation of described electrolevel comprises:
Be used for telescopic optical system to the collection of illustrative plates imaging;
With the image transformation of described modulation collection of illustrative plates is the photoelectric transformer of electric signal;
Be used for described electric signal is carried out the signal processing part of Fourier transform;
Response mensuration person's operation makes the mensuration starting command input media of measuring beginning;
According to described Fourier transform output level, the portion of calculating of the described high low head of computing;
Be used to detect the unusual anomalous discrimination portion of described Fourier transform output level after the described mensuration starting command input media starting;
Be used for reporting the annunciator of this anomalous discrimination portion testing result.
Description of drawings
Shown in the accompanying drawing is the embodiment of the invention.
Fig. 1 represents the formation of the 1st embodiment electrolevel;
Fig. 2 is the key diagram of the 1st embodiment electrolevel with scale 2;
Fig. 3 is the oblique view of expression the 1st embodiment electrolevel 1 outward appearance;
Fig. 4 represents the power spectrum of the 1st embodiment output signal;
Fig. 5 is the key diagram of the 1st embodiment range determination principle;
Fig. 6 is the key diagram of the 1st embodiment telemetering principle;
Fig. 7 is the key diagram of the 1st embodiment telemetering principle;
Fig. 8 is the key diagram of the 1st embodiment telemetering principle;
Fig. 9 is the closely key diagram of measuring principle of the 1st embodiment;
Figure 10 is the pie graph of the 1st embodiment arithmetic processing apparatus;
Figure 11 is the key diagram of the 1st embodiment effect;
Figure 12 is the collection of illustrative plates of the 2nd embodiment electrolevel with scale;
Figure 13 is the pie graph of the 3rd embodiment electrolevel 1;
Figure 14 is the pie graph of the 3rd embodiment arithmetic processing apparatus 16;
Figure 15 is the key diagram that the 3rd embodiment focuses and controls;
Figure 16 is the variation focusing control key diagram of the 3rd embodiment;
Figure 17 is the pie graph of the 4th embodiment electrolevel 1;
Figure 18 is the pie graph of the 4th embodiment arithmetic processing apparatus 16.
Embodiment
The embodiment of the invention is described with reference to the accompanying drawings.
The 1st embodiment
Form with scale 2 by electrolevel 1 and electrolevel as Fig. 1～present embodiment measurement mechanism shown in Figure 3.Electrolevel 1 is installed on the leveling apparatus 100 as shown in Figure 3.The electrolevel 1 of the 1st embodiment is made up of object lens 11, compensator 12, beam splitter 13, eyepiece 14, linear sensor 15 and arithmetic processing apparatus 16 as shown in Figure 1.
Back again, electrolevel has the 1st collection of illustrative plates A, the 2nd collection of illustrative plates B and the 3rd collection of illustrative plates R by equal intervals (P) repeated configuration as shown in Figure 2 with scale 2.That is, be one group with 3 kinds of collection of illustrative plates, each group is consecutively arranged to form, and the group that definition is configured in the first from left side is 0 group, and note makes R (0), A (0), B (0), and then repeated configuration becomes R (1), A (1), B (1), R (2), A (2), B (2) ...In addition, all collection of illustrative plates are by equal intervals p alternation, thereby the corresponding signal in interval therewith is made as reference signal.
Be set at the interval of 10mm among the 1st embodiment, but can adopt spacing distance arbitrarily.And the 3rd collection of illustrative plates R with black streaking width 8mm as fixed width, the 1st collection of illustrative plates A is one-period modulation black streaking partial width with 600mm, the 2nd collection of illustrative plates B is one-period modulation black streaking partial width with 570mm.In addition, the 1st collection of illustrative plates A and the 2nd collection of illustrative plates B can adopt any period as long as the cycle is variant.The modulation case of the 1st collection of illustrative plates A, the 2nd collection of illustrative plates B is shown in Fig. 2 (b).
The following describes the measuring principle of this measurement mechanism that as above constitutes.
At first the principle of electrolevel with scale 2 horizontal levels obtained in explanation.
Electrolevel is one-period modulation black streaking partial width with 600mm with the 1st collection of illustrative plates A of scale 2, and modulation width is made as 0～10mm, then the 1st collection of illustrative plates width D
AProvide by following formula.
D
A=5* (1+Sin (2* π * X/600-pi/2)) (formula 1)
Wherein, X=10mm, 40mm, 70mm.……
Equally, electrolevel is one-period modulation black streaking partial width with 570mm with the 2nd collection of illustrative plates B of scale 2, thereby the 2nd collection of illustrative plates width D
BProvide by following formula.
Wherein, X=20mm, 50mm, 80mm.……
In addition, added in formula 1 and the formula 2 ± pi/2 phase is poor, and this is in order to be convenient in signal Processing the signal of the 1st collection of illustrative plates A and the signal of the 2nd collection of illustrative plates B to be separated.
And, the 1st collection of illustrative plates A and the 2nd some difference of collection of illustrative plates B cycle, thereby identical collection of illustrative plates is appearring with the dicyclic for this reason lowest common multiple of the distance place of initial point.In the present embodiment, with the lowest common multiple 11400mm place of 570mm identical collection of illustrative plates appears at 600mm.Thereby the phase differential of the signal of the signal of the 1st collection of illustrative plates A and the 2nd collection of illustrative plates B changes to 2 π by 0 in 0～11400mm scope.
That is, the signal phase of establishing the 1st collection of illustrative plates A on the horizontal level is Φ
A, the signal phase of the 2nd collection of illustrative plates B is Φ on the horizontal level
B, then electrolevel with the horizontal level H of scale 2 is
H=11400* ((Φ
B-Φ
A-π)/Q π)) mm (formula 3)
If read electrolevel scale 2 by above-mentioned electrolevel 1, and make Fourier transform, then shown in Fig. 4 power spectrum, can obtain the periodic component of periodic component, the 3rd collection of illustrative plates R and the 1st collection of illustrative plates A of periodic component, the 2nd collection of illustrative plates B of the 1st collection of illustrative plates A and periodic component that the 2nd collection of illustrative plates B is one group (for 3 times of reference signal cycle) and reference signal (with the corresponding signal of equidistant p of collection of illustrative plates).In addition, the spectral line group is with electrolevel 1 and electrolevel reducing to low frequency one side shifting with the distance of scale 2.And among the spectral line group, the cycle minimum be reference signal (with the corresponding signal of equidistant P of collection of illustrative plates).This p that equidistantly is defined as, thereby can calculate electrolevel 1 and the distance of electrolevel with scale 2 by the lens imaging formula.
Promptly, as shown in Figure 5, electrolevel passes through the lens shaped imaging W of electrolevel 1 with the equidistant P of scale 2, so establishing from lens to electrolevel with the distance of scale 2 is L, distance from lens to the picture is d, then L=d (P/W), wherein d=f (f is the focal length of lens), therefore, L=d (p/w)=f (p/w).And the formed picture W of electrolevel 1 lens, the length of a pixel is made as C in linear sensor 15, when a wavelength of linear sensor 15 gained and the frequency (cycle) that equidistantly P is suitable is made as K, and W=CK then.Therefore, electrolevel 1 and electrolevel with the distance L of scale 2 are
L=((f/ (C*K))) * P (formula 4)
So, can be in the hope of electrolevel 1 and the approximate distance of electrolevel with scale 2.
The measuring principle of level height below is described.
The situation of telemetering at first is described.
As shown in Figure 6, if linear sensor 15 gained signals are made Fourier transform, just can obtain and the equidistant suitable signal of P.Here, establishing the phase place that Fast Fourier Transform (FFT) (FFT) tries to achieve is θ, and the phase place of the address location (m position) of the linear sensor 15 suitable with horizontal level is θ m, then
H
1=(θ m360 °) * p (formula 5)
That is, can equidistantly critically measure horizontal level H in the p scope
1(micrometric measurement).
And, in order to try to achieve horizontal level, need obtain from electrolevel with the approximate location that start at equidistant p collection of illustrative plates starting position that forms on the scale 2.Therefore, in front and back half pitch area of reference signal (signal suitable) with equidistant p to the output signal integration of linear sensor 15.Get one (product detection) with in per respectively 3 of this integrated value again, as shown in Figure 7, just can obtain being equivalent to the signal 1 of the 1st collection of illustrative plates A, the signal 3 that is equivalent to the signal 2 of the 2nd collection of illustrative plates B and is equivalent to the 3rd collection of illustrative plates R.But because the 3rd its width of collection of illustrative plates R is unmodulated, different with the maximum modulation width 10mm of the 1st collection of illustrative plates A and the 2nd collection of illustrative plates B, wide 8mm of the 3rd collection of illustrative plates R, thereby its integrated value of the signal of the 3rd collection of illustrative plates R is certain basically, compare with signal 2 with signal 1, its value is about 80% of these two kinds of signals.
And the 3rd collection of illustrative plates R, the 1st collection of illustrative plates A and the 2nd collection of illustrative plates B be by the order repeated configuration of determining, so the signal that takes out can determine it is any among the 3rd collection of illustrative plates R, the 1st collection of illustrative plates A, the 2nd collection of illustrative plates B at interval.And, in order to eliminate the influence of outer light such as shade, be that benchmark obtains (A-R), (B-R) signal as shown in Figure 8 with the signal of the 3rd collection of illustrative plates R.
Next, by (A-R), (B-R) signal, selection comprises one group of R, (A-R), (B-R) signal with horizontal level corresponding linear sensor 15 address locations (m position) and reference signal R, obtain (A-R) and phase place (B-R) again, so just can obtain electrolevel the 1st collection of illustrative plates A, the 2nd collection of illustrative plates B of scale 2 a certain positions and the combination of the 3rd collection of illustrative plates R.
Here, establishing (A-R) signal is Am, and (B-R) signal is Bm, and (A-R) 1/2 of the signal peak swing is Wa, and (B-R) 1/2 of the signal peak swing is Wb, and then (A-R) and phase place (B-R) are respectively:
(formula 6)
The magnitude portion of formula 7 is because the signal location of the 2nd collection of illustrative plates B departs from the signal 10mm of the 1st collection of illustrative plates A.
With formula 6 and formula 7 substitution formulas 3, just can use the horizontal level of scale 2 at electrolevel in the hope of the signal of the 1st collection of illustrative plates A.And, belong to the 3rd collection of illustrative plates R if comprise the reference signal of horizontal level, then deduct 10mm from this horizontal level, belong to the 2nd collection of illustrative plates B if comprise the reference signal of horizontal level, then on this horizontal level, add 10mm.Thereby can obtain horizontal level level height H roughly
2(rough mensuration).
In sum, can obtain the phase place (micrometric measurement) of horizontal level reference signal earlier, the reference signal of being obtained corresponding to horizontal level by the phase differential of the 1st collection of illustrative plates A, the 2nd collection of illustrative plates B is in from which position (rough mensuration) that electrolevel is started at the collection of illustrative plates starting position of scale 2 again, and makes these micrometric measurements H
1With rough measured value H
2Merge, thereby try to achieve level height H.
Situation about closely measuring below is described.
When closely measuring, after carrying out Fourier transform like that with telemetering, carry out product detection again and obtain the situation of level height and compare, because can obtain the 1st collection of illustrative plates A, the picture rich in detail of the 2nd collection of illustrative plates B and the 3rd collection of illustrative plates R is so be expected the method precision height of direct measured signal width.
At first as shown in Figure 9, for obtaining rising edge, the negative edge of linear sensor 15 outputs, output signal is carried out differential.Can be by these signals along the interval of obtaining between the black streaking part edge.But also obtain numerical digit corresponding to black streaking part center.This numerical digit be spaced apart the 1st collection of illustrative plates A, the 2nd collection of illustrative plates B, the pairing reference signal of the 3rd collection of illustrative plates R intermediate reach P.
Then, when obtaining the reference signal position before and after the address location (m position) corresponding to horizontal level, because the reference signal width is equivalent to 10mm at electrolevel on scale 2, so reference signal is distinguished N before and after establishing
f(N
fThe position), N
b(N
bThe position), height H then
1(accurate measurement is fixed) is
H
1=((m-N
f)/(N
b-N
f)) * 10 (formula 8)
Establishing the reference signal initial position again is N
e, the final position is N
s, number is n, then each reference signal mean value at interval is
K＝(N
o-N
3)/n
With this k value substitution formula 4, just can be in the hope of electrolevel 1 and the approximate distance of electrolevel with scale 2.
Because per from the off 3 width of width of black streaking part are got one, and the 3rd certain collection of illustrative plates R of identification width, press the sequence arrangement of the 3rd collection of illustrative plates R, the 1st collection of illustrative plates A, the 2nd collection of illustrative plates B again, so can determine the corresponding relation of this partial width and the 3rd collection of illustrative plates R, the 1st collection of illustrative plates A and the 2nd collection of illustrative plates B.
Determine to comprise reference signal corresponding to linear sensor 15 address locations (m position) of horizontal level again and belong among the 3rd collection of illustrative plates R, the 1st collection of illustrative plates A and the 2nd collection of illustrative plates B which, determine which group simultaneously corresponding to above-mentioned collection of illustrative plates.That is, then refer to the n group if be written as R (n), A (n), B (n).
So, because formula 1 is
D
A＝5*(1+Sin(2*π*Xa/600-π/2))
X wherein
a=30*n+10,
So can be by D
AValue is tried to achieve n.
Therefore,
N=(10/ π) * (Φ
a+ (pi/2))-(1/3) (formula 9)
Φ
a＝SIN
-1((D
A/5)-1)
n＝20*d+na
D=0 wherein, 1,2.……
Therefore n obtains the width D of the 2nd collection of illustrative plates B again
BEarlier with X=30*n+20 substitution formula 2, income value and D
BCompare, the n when consistent is by being asked group number.According to the kind of the 3rd collection of illustrative plates R under said n, the m, the 1st collection of illustrative plates A and the 2nd collection of illustrative plates B, level height H roughly
2(rough mensuration) is respectively:
H
2=30*n is during the 3rd collection of illustrative plates R
H
2=30*n+10 is during the 1st collection of illustrative plates A (formula 10)
H
2=30*n+20 is during the 2nd collection of illustrative plates B
In addition, not only judge 1 picture group spectrum, but also a plurality of positions before and after judging just can reduce the error rate that causes because of collection of illustrative plates is stained.
Therefore, can be according to obtaining reference signal corresponding to the black streaking partial width of the 3rd collection of illustrative plates R, the 1st collection of illustrative plates A and the 2nd collection of illustrative plates B institute respective signal, by determining to carry out micrometric measurement corresponding to the reference signal of the address location of horizontal level, carry out essence by signal phase difference and slightly measure corresponding to the 1st collection of illustrative plates A, the 2nd collection of illustrative plates B, and by making these micrometric measurement values H
1With rough measured value H
2Merge and obtain level height.
Above Shuo Ming assay method, except with modulated the 1st collection of illustrative plates A and the 2nd collection of illustrative plates B, also come modulated figure spectrum signal is distinguished with unmodulated the 3rd collection of illustrative plates R, but by obtaining corresponding to the signal of two kinds of collection of illustrative plates that the detected method of wavelength etc. separately, for discerning the 1st collection of illustrative plates a-signal and the 2nd collection of illustrative plates B signal, just can measure by the 3rd collection of illustrative plates R.
Below describe the arithmetic processing apparatus of being adorned on the present embodiment electrolevel 1 16 in detail.Amplifier 161 is the electric signal that amplify linear sensor 15, and sample-and-hold circuit 162 is by the timing signal of clock driver 165 amplification signal to be taken a sample and kept.A/D transducer 163 is to be used for the electric signal that sampling keeps is carried out the A/D conversion.And RAM164 is used for storing digital signal after the A/D conversion.In addition, 166 of microcomputers are carried out various calculation process.
Here, describe the function that microcomputer 166 is finished in detail according to Figure 10: arithmetic processing apparatus 16 forms portion 1661, figure spectrum signal by reference signal and forms portion 1662, collection of illustrative plates group test section 1663 and calculate portion 1664 and form, reference signal formation portion 1661 forms corresponding to the equidistant reference signal of p from the resulting electric signal of linear sensor 15 by Fourier transform when telemetering, and when closely measuring to the output signal differential of linear sensor 15, form reference signal by rising edge, negative edge.
1662 in figure spectrum signal formation portion carries out integration to half pitch area before and after the reference signal when telemetering, by removing one (product detection) in per 3 integrated values, form the 1st figure spectrum signal and the 2nd figure spectrum signal, and when closely measuring, form the 1st figure spectrum signal and the 2nd figure spectrum signal by taking out action at interval.
Collection of illustrative plates group test section 1663 is when closely measuring, by comparing the width D of the 1st collection of illustrative plates A
AAnd the 2nd collection of illustrative plates B width D
B, determine which group is the collection of illustrative plates group corresponding to horizontal level be.
Calculate portion 1664 when telemetering, ask by the phase place of near the 1st figure spectrum signal the boresight and the 2nd figure spectrum signal and calculate high low head, calculate high low head and when closely measuring, ask according to specific collection of illustrative plates group.
In addition, display 167 is to show to calculate high low head that portion 1664 calculates, can adopt display device such as liquid crystal display, also can make and export to external memory.
The 1st embodiment of above formation is described according to Figure 11.
At first,, electrolevel is arranged on tested fixed position with scale 2, makes electrolevel 1 starting begin to measure at step 1 (S1).Next, at S2,15 pairs of object lens of linear sensor, 11 formed electrolevels are made a video recording with the 3rd collection of illustrative plates R, the 1st collection of illustrative plates A of scale 2 and the picture of the 2nd collection of illustrative plates B, and are transformed to electric signal.To carry out the A/D conversion from the electric signal that linear sensor 15 is obtained at S3 again, the digital signal after S4 is with conversion stores among the RAM164.At S5, by the electric signal of obtaining from linear sensor 15 being done Fast Fourier Transform (FFT) (FFT).Be not limited to FFT, can also adopt maximum entropy method (MEM) (MEM) etc., as long as can try to achieve frequency spectrum, any method is all available.
Among the ensuing S6, the selection cycle minimum is reference signal in the resulting frequency spectrum group of S5.And, in S7 arithmetic expression 4, calculate electrolevel 1 and the approximate horizontal distance of electrolevel with scale 2.At S8, judge it is closely to measure or telemetering according to the operation result of S7.In this 1st embodiment, with below the 10m as mensuration closely, but can appropriate change.Judge among the S8 and just enter S9 when being telemetering.In S9, in half pitch area of the front and back of reference signal to the output signal integration of linear sensor 15.In step S10, take out 1 (product detection) by per 3 integrated values respectively, extract signal 1, corresponding to the signal 2 of the 2nd collection of illustrative plates B and corresponding to the signal 3 of the 3rd collection of illustrative plates R corresponding to the 1st collection of illustrative plates A.Then, at S11,, compare this value with signal 2 with signal 1 and be about this two kinds of signals 80% because certain basically corresponding to signal 3 its integrated values of the 3rd collection of illustrative plates R, and each collection of illustrative plates is certain in proper order, can determine it is any of the 1st collection of illustrative plates, the 2nd collection of illustrative plates and the 3rd collection of illustrative plates R.At S12, arithmetic expression 6 and formula 7 are to obtain Φ A, Φ
B, enter S13 again, the operation result substitution formula 3 of S12 can be measured H roughly
2
In S14 arithmetic expression 5, finish micrometric measurement H again
1Afterwards, enter S15, make micrometric measurement value H
1With rough measured value H
2Merge, try to achieve level height H, and judge to measure and whether finish.
Next, be judged as among the S8 when closely measuring, enter S16, the output signal of linear sensor 15 is made differential, detect rising edge, negative edge.In S17, obtain the interval between the black streaking part edge again, determine and the corresponding numerical digit in black streaking part center.At S18, the value that is drawn by S17 forms the reference signal of equidistant P.
Then, in S19 arithmetic expression 8, carry out micrometric measurement H
1, get 1 respectively in the density of per from the off 3 black streakings part of S20, with the 3rd certain collection of illustrative plates R of identification width.At S21,, thereby can determine the corresponding relation of signal and the 3rd collection of illustrative plates R, the 1st collection of illustrative plates A and the 2nd collection of illustrative plates B because the order of each collection of illustrative plates is certain.
At S22, determine to organize corresponding to which corresponding to the reference signal of horizontal level,, measure H roughly again in S23 arithmetic expression 10 with formula 9 grades
2And then, enter S15, make micrometric measurement value H
1With rough measured value H
2Merge, obtain level height H, judge again to measure and whether finish.When S15 is judged as the mensuration end, just enters S24 and stop measuring.Be judged as mensuration when not finishing at S15, then turn back to step S2.
Also have, S12 comes the high low head of computing by the determined vertical position of S11, shows operation values on display 167.Enter into S13 again, and judge to measure and whether finish, enter S14 when measuring end and stop measuring.At S13, measure when not finishing, just get back to the S2 duplicate measurements.
In addition, calculate portion 1664 and can make by level height H and obtain high low head, on display 167, show.
The 2nd embodiment
The present invention the 2nd embodiment below is described.
This 2nd embodiment by only adopting modulated the 1st collection of illustrative plates A and the 2nd collection of illustrative plates B, does not adopt the 3rd collection of illustrative plates R, tries to achieve separately wavelength by detected 2 kinds of collection of illustrative plates institute respective signal, discerns the 1st collection of illustrative plates a-signal and the 2nd collection of illustrative plates B signal, and measures.
The electrolevel of the 2nd embodiment scale 2, as shown in figure 12, the 1st collection of illustrative plates A and the 2nd collection of illustrative plates B do not dispose the 3rd collection of illustrative plates R by equidistant from distance (P) repeated configuration, and this point is different with scale 2 with the electrolevel of the 1st embodiment.
Below signal Processing is illustrated because more, so only describe with regard to difference with the common ground of the 1st embodiment
At first, be identical with scale 2 apart from this point according to reference signal computing electrolevel 1 and electrolevel.
When telemetering, micrometric measurement is identical with first embodiment again.In rough the mensuration, to the output signal integration of linear sensor 15, in the signal extraction of Figure 11 step 10 (S10) was handled, per 2 integrated values were got 1 respectively, to obtain corresponding to the signal 1 of the 1st collection of illustrative plates A and corresponding to the signal 2 of the 2nd collection of illustrative plates B.
Here, for telemetering, the identification of resultant signal was detected for 1 cycle at least.Therefore, the signal differentiation that the cycle is long of collection of illustrative plates identification part is the signal 1 corresponding to the 1st collection of illustrative plates A, and the signal differentiation that the cycle is short is signal 2.Differentiate like this for after signal 1 and the signal 2, just can obtain phase place Φ like that respectively with the 1st embodiment
A, Φ
B, and merge with the micrometric measurement value and to try to achieve level height.The function of collection of illustrative plates identification part is realized by arithmetic processing apparatus 16.
When closely measuring, in the signal deterministic process of step 21 among Figure 11 (S21), because the collection of illustrative plates spacing on the linear sensor 15 of electrolevel 1 is equivalent to width W, so, differentiate corresponding to the signal 1 of the 1st collection of illustrative plates A and corresponding to the signal 2 of the 2nd collection of illustrative plates B according to the variable quantity of each deration of signal and the spacing width of reference signal.Specifically, at first the 1st collection of illustrative plates cycle was set at 600mm, the 2nd collection of illustrative plates cycle was set at 570mm, and then the pulse width of two kinds of collection of illustrative plates is identical with formula 1, formula 2 respectively, promptly
D
A=5* (1+SIN (2* π * X
a/ 600-pi/2)) (formula 11)
But X wherein
a=20*n;
D
B=5* (1+SIN (2* π * X
b/ 570+ pi/2)) (formula 12)
But X wherein
b=20*n+10.In addition, n is the sequence number of collection of illustrative plates group, and n=1,2 ...
Otherwise, by D
A, D
BThe formula that value is obtained n can be out of shape following formula, and table is:
N=(15/ π) * ((Φ
A+ pi/2) (formula 13)
Φ
A＝SIN
-1(D
A/5-1)
(provide D
A) time;
N=(57/4 π) * (Φ
b-pi/2)-(1/2) (formula 14)
Φ
B＝SIN
-1(D
B/5-1)
(provide D
BThe time).
In the resulting signal, getting initial pulse width is D
A, try to achieve n by formula 13.This situation can be in 1 cycle of 600mm.N can try to achieve 2 values, but can be summed up as a value than initial pulse width is big still little according to the 2nd pulse width.Pulse width when then obtaining n and be n+1, and writing D by formula 11
A+1Equally, can try to achieve initial pulse width is D
BThe time n, and the writing D
B+1If a back pulse width and the D of initial pulse width
A+1Close, then initial pulse width is judged to the A collection of illustrative plates, and and D
B+1Close, initial pulse width just is judged to the B collection of illustrative plates.
Differentiated like this after signal 1 and the signal 2, like that collection of illustrative plates group sequence number has been determined, and merged, obtained level height with micrometric measurement with the 1st embodiment.
Other of the 2nd embodiment constitute because its explanation of identical Therefore, omited with the 1st embodiment.
In addition, among the 1st embodiment and the 2nd embodiment, be to form the 1st and the 2nd collection of illustrative plates, but the invention is not restricted to this, the collection of illustrative plates width is not changed and by the collection of illustrative plates concentration change is modulated by the spatial modulation that makes the collection of illustrative plates wide variety.
As above the 1st embodiment of Gou Chenging and the 2nd embodiment, for the electrolevel scale, the 1st collection of illustrative plates, the 2nd collection of illustrative plates and according to circumstances and the 3rd collection of illustrative plates that needs on direction of measurement by the equal intervals series arrangement, the 1st collection of illustrative plates and the 2nd collection of illustrative plates form the mutually different figure spectral width of period of change, and according to circumstances needed the 3rd collection of illustrative plates forms equal figure spectral width.And, the collection of illustrative plates test section of electrolevel reads the 1st collection of illustrative plates, the 2nd collection of illustrative plates and according to circumstances needed the 3rd collection of illustrative plates, reference signal formation portion forms reference signal by the detected detection signal of collection of illustrative plates test section, figure spectrum signal formation portion forms the formed reference signal of portion by this reference signal and the detected detection signal of collection of illustrative plates test section forms the 1st figure spectrum signal and the 2nd figure spectrum signal, high low head is calculated by near the 1st figure spectrum signal the boresight and the phase place of the 2nd figure spectrum signal by the portion of calculating, thereby need not carry out computing such as phase simple crosscorrelation, reach the effect that minute shortens.
The 1st embodiment and the 2nd embodiment also make its reference signal formation portion and form reference signal by the pulse width of the detected detection signal of collection of illustrative plates test section, collection of illustrative plates group test section determines to comprise the collection of illustrative plates group of boresight by the figure spectral width of near the 1st figure spectrum signal the boresight and the 2nd figure spectrum signal, and high low head is calculated according to fixed collection of illustrative plates group by the portion of calculating.
The 1st embodiment and the 2nd embodiment can make again the portion of calculating and electrolevel with the distance between the scale during less than certain value, calculate high low head according to the collection of illustrative plates group of determining, and electrolevel during greater than certain value, calculate high low head with the distance between the scale by near the 1st figure spectrum signal the boresight and the phase place of the 2nd figure spectrum signal.
Electrolevel adds the modulation of some cycles with the 2nd collection of illustrative plates and the 3rd collection of illustrative plates of scale, thereby has and needn't store full detail and handle, and just can realize the remarkable effect of electrolevel with simple formation.
In addition, the electrolevel of the 1st embodiment uses scale except the 1st collection of illustrative plates and the 2nd collection of illustrative plates, also increase the 3rd equidistant and consistent collection of illustrative plates, and their spaced sequence are formed, electrolevel is differentiated 1st figure spectrum signal and 2nd figure spectrum signal according to consistent the 3rd figure spectrum signal by the collection of illustrative plates identification part is set in the middle of the signal that the collection of illustrative plates test section extracts, thereby has the effect that can easily differentiate the 1st figure spectrum signal and the 2nd figure spectrum signal.
The 3rd embodiment
The present invention the 3rd embodiment below is described with reference to the accompanying drawings.
The 3rd embodiment is made of object lens 12, beam splitter 13, eyepiece 14, linear sensor 15, arithmetic processing apparatus 16 and drive division 17 as shown in figure 13.
In addition, other formation its explanations of identical Therefore, omited with the 1st embodiment of the 3rd embodiment.Electrolevel is identical with the 1st embodiment shown in Figure 2 with scale 2, also omits its explanation.
And object lens 11, compensator 12, beam splitter 13 and eyepiece 14 are equivalent to telescopical optical system, and linear sensor 15 is equivalent to photoelectric transformer.
Below, according to Figure 14 the function that the microcomputer 166 of the 3rd embodiment is finished is described: arithmetic processing apparatus 16 by reference signal form that portion 1661, figure spectrum signal form portion 1662, collection of illustrative plates group test section 1663, calculate portion 1664, focusing control part 1665 and collection of illustrative plates identification part 1666 form.
1665 pairs of electric signal that obtain from linear sensor 15 of focusing control part carry out Fourier transform, make this Fourier transform output level for maximum in order to controlling and driving portion 17.In addition, Fourier transform can be utilized the Fast Fourier Transform (FFT) of reference signal formation portion 1661.It is the function that arithmetic processing apparatus 16 also has signal processing part.
The focusing control principle of the control part 1665 of explanation focusing here.Electrolevel is arranged by equidistant from distance p with scale 2, and each width of fringe is modulated.Read this collection of illustrative plates by linear transducer 15 sensors such as one dimension such as grade,, just can obtain the 1st embodiment power spectrum shown in Figure 4 if this output signal is carried out Fourier transform.
If the unit of transverse axis is " week ", then at following column position peak value appears:
Nh/ (p/ (d*f)) (week/the n position)
Here, p is the collection of illustrative plates spacing of electrolevel with scale 2, and d is the distance of electrolevel with scale 2 and electrolevel 1, and f is the focal length of electrolevel 1 optical system, n is the one dimension sensor figure place of carrying out Fourier transform, and h is an one dimension sensor bit interval.
Peak level descends along with departing from focusing position.Therefore, can monitor peak level, and carry out the focusing action, by detecting the control of focusing of peak level position.
Collection of illustrative plates identification part 1666 is to carry out collection of illustrative plates coupling usefulness with the energy collection of illustrative plates of scale 2 collection of illustrative plates pictures for the retrieve electronic level meter.
Other formations of arithmetic processing apparatus 16 are identical with the 1st embodiment in addition, thereby omit its explanation.
The focusing action of the 3rd embodiment of above formation is described according to Figure 15.
This 3rd embodiment adopts linear sensor 15, and at step 1 (S1), the focusing control part 1665 of arithmetic processing apparatus 16 makes drive division 17 actions, and interior lens 112 is at the uniform velocity mobile from the nearly side of infinity direction one side.And judge whether through the stipulated time at S2, be through the stipulated time, enter S3, just obtain data by linear sensor 15.Then at S4, arithmetic processing apparatus 16 carries out Fourier transform, compares at S5 and last secondary data, judges whether the conversion output level of Fourier transform surpasses peak value.Whether the conversion output level of just judging Fourier transform surpasses maximal value.When the conversion output level that is judged as Fourier transform at S5 surpasses maximal value, enter S6, focusing control part 1665 makes interior lens 112 stop to move with regard to controlling and driving portion 17; When the conversion output level that is judged as Fourier transform at S5 surpasses maximal value, just turn back to S2.
After S6 makes interior lens 112 stop to move, enter S7 again, focusing control part 1665 makes drive division 17 actions, and interior lens 112 is left last position, and is at the uniform velocity mobile from the infinite distant place of nearly direction.Next at S8, be taken into data by linear sensor 15 after, carry out Fourier transform at S9 arithmetic processing apparatus 16.And, compare with last secondary data at S10, judge whether the conversion output level of Fourier transform surpasses peak value.At S10
aWhen the conversion output level that is judged as Fourier transform surpasses maximal value, promptly focus, enter S11, focusing control part 1665 controlling and driving portions 17 make interior lens 112 stop to move.When the conversion output level that is judged as Fourier transform at S10 is no more than peak value, just turns back to S7 and continue focusing control.
As above the 3rd embodiment of Gou Chenging can be by the conversion output level maximal value control of focusing of search Fourier transform.
The variation of the 3rd embodiment
Following the 3rd embodiment variation that adopts surface sensor 151 to replace linear sensor 15 that illustrates according to Figure 16.
At step 1 (S1), the focusing control part 1665 of arithmetic processing apparatus 16 makes drive division 17 actions, and interior lens 112 is at the uniform velocity mobile from the nearly side of infinite distance direction one side.And judging whether through the stipulated time at S2, is through the stipulated time, then enters S3, is taken into data by surface sensor 151.Next judge whether to determine the column position of surface sensor 151 at S4.Promptly search for the electrolevel column position of the collection of illustrative plates of scale 2 as the place.And, be judged as when S4 did not determine the column position of surface sensor 151, after entering S5 and taking out 1 row, arithmetic processing apparatus 16 carries out Fourier transform.Judged whether and the akin spectrogram of clock signal in the collection of illustrative plates identification part 1666 of S6 arithmetic processing apparatus 16 again.Promptly judge the electrolevel that whether occurs the as shown in Figure 4 power spectrum pattern of scale 2 collection of illustrative plates pictures by the figure spectrum discrimination.At S6, when collection of illustrative plates identification part 1666 is identified with the akin spectrogram of clock signal, just enter S7, store into the row of this surface sensor 151 among the RAM164 after, return S2.
, enter S8 and judge whether to see whole row during 1666 unidentified and the akin spectrograms of clock signal in step S6 collection of illustrative plates identification part.Be judged as when seeing whole row at S8, return S2, just turn back to S5 when not seeing whole row being judged as.
When S4 is judged as the column position of determining surface sensor 151, enter S9, compare with last data, judge whether the conversion output level of Fourier transform surpasses peak value.When the conversion output level that is judged as Fourier transform at S9 surpasses maximal value, enter step S10, focusing control part 1665 controlling and driving portions 17 make interior lens 112 stop to move.When the conversion output level that is judged as Fourier transform at S9 is no more than maximal value, just return S2.
After S10 makes interior lens 112 stop to move, enter S11, focusing control part 1665 makes drive division 17 starts, and interior lens is left last position, moves from the infinite distant place of nearly direction low speed.This move with S1 in compare, for low speed moves, thereby can carry out accurate adjustment.Below after S12 is taken into data by surface sensor 151, carry out Fourier transform at S13 arithmetic processing apparatus 16.And S14 with on once data relatively, whether the conversion output level of judging Fourier transform above peak value.When the conversion output level that is judged as Fourier transform at S14 surpasses maximal value, be exactly to focus, enter S15, focusing control part 1665 makes interior lens 112 stop to move with regard to controlling and driving portion 17.When the conversion output level that is judged as Fourier transform at S14 surpasses peak value, just return S12 and continue focusing control.
In sum, the variation of the 3rd embodiment is by the conversion output level maximal value of search Fourier transform, the control of can focusing.The variation of the 3rd embodiment, its focusing control part 1665 is according to the rough resulting Fourier transform output level of set-up procedure, obtain focusing position roughly, and then carry out precision according to the resulting Fourier transform output level of trickle set-up procedure and adjust, the control of can focusing at high speed.
And, the 3rd embodiment variation, its focusing control part 1665 makes by Fourier transform output level linear-apporximation imagination output peak value and controls.
Above-mentioned the 3rd embodiment can be only with modulated the 1st collection of illustrative plates A and the 2nd collection of illustrative plates B, need not the 3rd collection of illustrative plates R, obtain separately wavelength from detected two kinds of corresponding signals of collection of illustrative plates, and discern the signal of the 1st collection of illustrative plates A and the signal of the 2nd collection of illustrative plates B thus, and measure.
As above the variation of the 3rd embodiment of Gou Chenging and the 3rd embodiment is the numerical operation of carrying out prior art and handles, thereby omits explanation except that focusing control.
As above the 3rd embodiment of Gou Chenging, be to have the scale of equidistant arrangement collection of illustrative plates to aim to surveying length direction, and automatically obtain the electrolevel of high low head, what this embodiment made telescopic optical system forms the collection of illustrative plates picture to focus optical system, photoelectric transformer receives the light from telescopic optical system, collection of illustrative plates is transformed to signal, and focusing portion makes again and forms collection of illustrative plates on the photoelectric transformer.And, signal processing part carries out Fourier transform to the output of photoelectric transformer, the focusing control part is controlled focusing portion according to the output level of signal processing part again, thereby do not need new focusing unit, focusing portion only need increase the drive division control of just can focusing automatically, and that its remarkable effect is is simple for structure, cost is cheap.
The 3rd embodiment can also be like this: its focusing portion from as far as near or from closely to the focal position is moved, the focusing control part moves the control of focusing of resulting signal processing part output level according to above-mentioned.
The focusing control part of the 3rd embodiment again can be like this: try to achieve roughly focusing position according to the resulting Fourier transform output level of rough set-up procedure, carry out precision adjustment according to the resulting Fourier transform output level of trickle set-up procedure then.
The focusing control part of the 3rd embodiment can also pass through linear-apporximation by the output level of signal processing part, supposes the output peak, and controls.
The 4th embodiment
The present invention the 4th embodiment is described with reference to the accompanying drawings.
The 4th embodiment is made of object lens 11, compensator 12, beam splitter 13, eyepiece 14, linear sensor 15 and arithmetic processing apparatus 16 as shown in figure 17.
Measure the input media that starting switch 168 is equivalent to measure starting command, person's operation makes the arithmetic processing apparatus starting after measured, just can make and measure beginning.In addition, measure the starting command input media and be not limited to switchgear, as long as can make arithmetic processing apparatus 16 startings, any input media can adopt.
Other formations of the 4th embodiment are identical with the 1st embodiment, its explanation of Therefore, omited.And electrolevel also the 1st embodiment with shown in Figure 2 is identical with scale 2, its explanation of Therefore, omited.
Below, according to Figure 18 the function that microcomputer 166 is finished is described.Arithmetic processing apparatus 16 forms portion 1661, figure spectrum signal by reference signal and forms portion 1662, collection of illustrative plates group test section 1663, calculates portion 1664, collection of illustrative plates identification part 1666 and anomalous discrimination portion 1667 and form.
Anomalous discrimination portion 1667 is used to detect the unusual of the Fourier transform output that obtains from reference signal formation portion 1661 when measuring starting switch 168 startings, and driving display 167 and hummer 169 are reported unusually.
Here the anomalous discrimination principle of specification exception judegment part 1667.Electrolevel is arranged by equal intervals p with scale 2, and each stripe width is what to modulate.Read the interpreting blueprints spectrum by linear sensor 15 sensors such as one dimension such as grade,, just can obtain the power spectrum shown in Figure 4 as the 1st embodiment if this signal is carried out Fourier transform.
If the unit of transverse axis is week, then at following column position peak value appears:
Nh/ (p/d*f) (week/the n position)
Here, p is the collection of illustrative plates interval of electrolevel with scale 2; D is the distance of electrolevel with scale 2 and electrolevel 1; F is the focal length of the optical system of electrolevel 1; N is the one dimension sensor figure place of carrying out Fourier transform; H is the bit interval of one dimension sensor.
And this spectral line is when doing aiming to the scale beyond the regulation, and spectral line changes, and the cycle that the spectral line peak value occurs also changes.Therefore, if this spectrogram is discerned, just can detect the aim bias of electrolevel with scale 2.
When off-focal,, Fourier transform descends again, so can automatically detect the focus offset of electrolevel by this level value is limited to more than the setting with scale 2 because exporting.
In addition, anomalous discrimination portion 1667 detects when unusual, will be on display 167 the display abnormality situation, hummer 169 sends and pipes.Be that display 167 all is equivalent to warning device with hummer 169, but be not limited to warning device,, can adopt any device as long as can report unusually to the user.And can also clearly illustrate aim bias, focus deviation or other situation on the display 167.
Other formations of arithmetic processing apparatus 16 are identical with the 1st embodiment and the 3rd embodiment, its explanation of Therefore, omited.
As above the 4th embodiment of Gou Chenging is when the user presses mensuration starting switch 168, and arithmetic processing apparatus 16 just starts.And reference signal formation portion 1661 utilizes Fast Fourier Transform (FFT), after doing conversion from linear sensor 15 resulting electric signal, forms spectrogram.
Then, starting collection of illustrative plates identification part 1666 judges by anomalous discrimination portion 1667 whether the spectrogram that carried out the figure spectrum discrimination is correct.It is incorrect that anomalous discrimination portion 1667 is judged as spectrogram, and when aim bias takes place, display abnormality situation on display 167 just, and hummer 169 pipes.
Anomalous discrimination portion 1667 also judges the Fourier transform output level that reference signal formation portion 1661 carried out Fourier transform, when certain level is following, just think off-focal, display abnormality situation on display 167, hummer 169 sends and rings simultaneously.
Anomalous discrimination portion 1667 does not determine when unusual, and arithmetic processing apparatus 16 will begin calculating such as high low head.Implementation such as numerical operation mode is to have illustrated in the prior art in addition, its explanation of Therefore, omited.
The 4th embodiment can only adopt modulated the 1st collection of illustrative plates A and the 2nd collection of illustrative plates B, need not the 3rd collection of illustrative plates R, and obtain separately wavelength from detected 2 kinds of pairing signals of collection of illustrative plates, and after discerning the 1st collection of illustrative plates a-signal and the 2nd collection of illustrative plates B signal thus, measure.That is, be not limited to the electrolevel scale 2 of 3 cycle collection of illustrative plates, can also adopt the electrolevel scale 2 of 2 cycle collection of illustrative plates.
The 4th embodiment of Gou Chenging as mentioned above, be to aim to survey the scale that the length direction equal intervals is arranged with collection of illustrative plates, automatically obtain the electrolevel of high low head, this embodiment makes telescopic optical system and forms the collection of illustrative plates picture, the light that photoelectric transformer receiving telescope optical system is come, after collection of illustrative plates was transformed to signal, signal processing part just carried out Fourier transform to the output of photoelectric transformer.And under mensuration person's operation, measure the starting command input media and just make the mensuration beginning, calculate the Fourier transform output of portion according to signal processing part, the high low head of computing, anomalous discrimination portion is also when measuring the starting of starting command input media, the Fourier transform output abnormality of detection signal handling part is reported the anomalous discrimination result by warning device, thereby has the effect that can automatically detect the Fourier transform output abnormality.
And, equidistantly be arranged with the scale of collection of illustrative plates along the survey length direction of telescopic optical system imaging, it is scale with at least 2 cycle collection of illustrative plates setting with regulation ratio, can make anomalous discrimination portion is judged the defective that signal processing part produces the Fourier transform output level, whether this basis has 2 frequency spectrums of regulation ratio, differentiate unusual condition, thereby have and to detect aim bias, focal length deviation automatically, to prevent to measure mistake.
In addition, the warning device of the 4th embodiment can also make display device show or/and the alerting tone generating means is sounded.
Claims (7)
1. electrolevel, it is characterized in that, be used for measuring automatically the high low head of the described scale of scale starting point distance with the intersection point of described electrolevel boresight, described scale has the modulation collection of illustrative plates of alternately arranging in the length direction equal intervals of described scale, and its formation of described electrolevel comprises:
Comprise focus optical system in interior telescopic optical system, be used for above-mentioned collection of illustrative plates imaging;
With the image transformation of described modulation collection of illustrative plates is the photoelectric transformer of electric signal;
Make described collection of illustrative plates be imaged on the focusing portion on the described photoelectric transformer with adjustable way;
Described electric signal is carried out the signal processing part of Fourier transform;
The focusing control part that the output level that responds described Fourier transform is controlled described focusing portion.
2. electrolevel as claimed in claim 1 is characterized in that, the focusing control part according to focusing portion by far to described Fourier transform output level near or that obtain when the focal position is moved, the control of focusing.
3. electrolevel as claimed in claim 1, it is characterized in that, the focusing control part carries out minute adjustment according to the resulting described Fourier transform output level of trickle set-up procedure after constituting and obtaining roughly focusing position according to the rough resulting described Fourier transform output level of set-up procedure again.
4. electrolevel as claimed in claim 1 is characterized in that, the focusing control part constitutes the estimation of exporting peak value by the linear-apporximation that described Fourier transform output level is drawn, and carries out described focusing control.
5. electrolevel, it is characterized in that, be used for measuring automatically the high low head of the described scale of scale starting point distance with the intersection point of described electrolevel boresight, described scale has the modulation collection of illustrative plates of alternately arranging in the length direction equal intervals of described scale, and its formation of described electrolevel comprises:
Be used for telescopic optical system to the collection of illustrative plates imaging;
With the image transformation of described modulation collection of illustrative plates is the photoelectric transformer of electric signal;
Be used for described electric signal is carried out the signal processing part of Fourier transform;
Response mensuration person's operation makes the mensuration starting command input media of measuring beginning;
According to described Fourier transform output level, the portion of calculating of the described high low head of computing;
Be used to detect the unusual anomalous discrimination portion of described Fourier transform output level after the described mensuration starting command input media starting;
Be used for reporting the annunciator of this anomalous discrimination portion testing result.
6. electrolevel as claimed in claim 5, it is characterized in that, described scale has at least 2 cycle collection of illustrative plates of ratio formation in accordance with regulations, whether the defective to the described Fourier transform output level of described signal processing part during described anomalous discrimination portion work judges, and described unusual according to existing 2 kinds of frequency spectrums with described regulation ratio to differentiate.
7. as claim 5 or 6 described electrolevels, it is characterized in that described annunciator comprises display device or alerting tone generating means.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01137724 CN1267700C (en) | 2001-10-26 | 2001-10-26 | Electronic level meter and electronic level meter surveying rod |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01137724 Division CN1267700C (en) | 2001-10-26 | 2001-10-26 | Electronic level meter and electronic level meter surveying rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1773215A CN1773215A (en) | 2006-05-17 |
| CN100565102C true CN100565102C (en) | 2009-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101250607A Expired - Fee Related CN100565102C (en) | 2001-10-26 | 1993-12-22 | Electrolevel |
| CN 01137724 Expired - Fee Related CN1267700C (en) | 2001-10-26 | 2001-10-26 | Electronic level meter and electronic level meter surveying rod |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01137724 Expired - Fee Related CN1267700C (en) | 2001-10-26 | 2001-10-26 | Electronic level meter and electronic level meter surveying rod |
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| CN (2) | CN100565102C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5378259B2 (en) * | 2010-02-10 | 2013-12-25 | 株式会社 ソキア・トプコン | Electronic level |
| JP6486097B2 (en) * | 2014-12-19 | 2019-03-20 | キヤノン株式会社 | POSITION DETECTION DEVICE, LENS DEVICE, IMAGING SYSTEM, MACHINE DEVICE, POSITION DETECTION METHOD, PROGRAM, AND STORAGE MEDIUM |
| CN113532381A (en) * | 2021-08-05 | 2021-10-22 | 湖南旺轩科技有限公司 | Wind tower settlement measuring device and measuring method |
-
1993
- 1993-12-22 CN CNB2005101250607A patent/CN100565102C/en not_active Expired - Fee Related
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2001
- 2001-10-26 CN CN 01137724 patent/CN1267700C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1773215A (en) | 2006-05-17 |
| CN1267700C (en) | 2006-08-02 |
| CN1412522A (en) | 2003-04-23 |
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