CN104749753A - Hartmann sensor relay lens with multiplying power fine-adjustment mechanism - Google Patents
Hartmann sensor relay lens with multiplying power fine-adjustment mechanism Download PDFInfo
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- CN104749753A CN104749753A CN201510148062.1A CN201510148062A CN104749753A CN 104749753 A CN104749753 A CN 104749753A CN 201510148062 A CN201510148062 A CN 201510148062A CN 104749753 A CN104749753 A CN 104749753A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
Abstract
The invention discloses a Hartmann sensor relay lens with a multiplying power fine-adjustment mechanism, and belongs to the field of photoelectric detection and adaptive optics. In order to overcome the shortcoming that the multiplying power in the traditional Hartmann sensor relay lens is fixed, a front component, a rear component and an adjusting component are arranged in a relay lens barrel; a front component lens is fixed by a pressure ring; a rear component lens is arranged in a rear component seat and is fixed by a rear component pressure ring; an adjusting component lens is arranged on an adjusting component seat and is fixed by an adjusting component pressure ring; the adjusting component lens can move in the front-back direction by shifting an adjusting component shifting column, so that fine adjustment on the multiplying power of the relay lens is realized; after the relay lens is adjusted to an accurate position, an adjusting component set screw is screwed down to fix the adjusting component; the front component is a combination of a negative lens and a positive lens which are adhered to each other; the focal power of the front component is positive; the negative lens is a meniscus lens; the positive lens is a double-convex-shaped lens; the rear component is a combination of a positive lens and a negative lens which are adhered to each other; the focal power of the rear component is positive; the positive lens is a double-convex-shaped lens; the negative lens is a meniscus lens; and the multiplying power adjusting component is a meniscus lens with positive focal power.
Description
Technical field
The present invention relates to a kind of Hartmann sensor relaying camera lens with multiplying power micro-adjusting mechanism, belong to photodetection and adaptive optics field.
Background technology
Hartmann sensor is a kind of phase information optical measuring apparatus obtaining wavefront by measuring wavefront slope, is most important Wavefront detecting instrument in the fields such as adaptive optics, active optics, laser beam inspection.
As shown in Figure 1, Hartmann sensor is made up of microlens array, relaying camera lens, CCD camera and corresponding data acquisition processing system.Wherein, relaying camera lens is imaged onto camera target surface for the stigma image formed by lenticule according to certain enlargement ratio, realizes the coupling between lenslet dimension and camera pixel.Especially in ADAPTIVE OPTICS SYSTEMS Wavefront detecting, mating between lenticule with pixel is the most important, reason is the calibration object of adaptive optics is the wavefront error that atmospheric disturbance causes, emending frequency requires very high, in order to improve the reading speed of Hartmann wave front sensor, the CCD camera that sensor uses should have as far as possible few pixel count, which has limited single sub-aperture become stigma on CCD sampling rate, shared by general single stigma, picture dot number is about 2 × 2, even less.For so low sampling rate, in order to make each sub-aperture stigma centroid calculation not by the impact of discrete sampling, must ensure that the pixel sampling situation of each stigma is consistent, also just requiring pixel count shared by single size of sub-aperture is strictly integer, slightly deviation then will make stigma consistance be affected, the measuring accuracy of restriction Hartmann sensor, even cannot measure.
As shown in Figure 2, for stigma sampling situations schematic diagram when actual multiplying power is only 3.33% with design magnification error, in figure, lattice represents CCD pixel, great circle represents the target position that single sub-aperture is corresponding, in Fig. 2 (a), roundlet represents the actual position of stigma on target surface, and Fig. 2 (b) is the situation of stigma after discrete sampling.Can find out due to magnification error, making pixel count shared by size of sub-aperture is not integer, and after the discrete sampling of CCD picture dot, putting shape of spot, irregular change occurs, and will affect centroid calculation precision.
Current Hartmann sensor relaying camera lens is fixed multiplying power camera lens, and design although multiplying power to be mated with CCD Pixel Dimensions in strict accordance with lenslet dimension, due to processing, alignment error, the multiplying power making system final and design load have a certain amount of deviation.Especially optical manufacturing error is inevitable, and generally magnification error cannot be compensated by the adjustment of simple interval, thus will affect the performance of Hartmann sensor.
Summary of the invention
The present invention overcomes the fixing shortcoming of traditional Hartmann sensor relaying lens ratio, the Hartmann sensor relaying camera lens of band multiplying power micro-adjusting mechanism is proposed, the trace adjustment of enlargement ratio is realized by adjustment assembly, compensate the multiplying power deviation because processing, alignment error produce, ensure that lenslet dimension is strictly mated with CCD Pixel Dimensions.
The scheme of technical solution problem of the present invention is:
With the Hartmann sensor relaying camera lens of multiplying power micro-adjusting mechanism, it is characterized in that,
Front constituent element in this relaying camera lens, rear constituent element and adjustment constituent element are arranged in relaying lens barrel, front constituent element is fixed by front constituent element trim ring, rear constituent element lens are arranged in rear constituent element seat, and fixed by rear constituent element trim ring, regulate constituent element lens to be arranged on and regulate on constituent element seat, fixed by adjustment constituent element trim ring, regulate constituent element reversed column can move forward and backward adjustment constituent element lens by stirring, realize the fine setting of relaying lens ratio, after adjusting to accurate location, tighten and regulate constituent element holding screw to realize the fixing of adjustment constituent element.
Front constituent element is focal power is positive negative, positive cemented doublet, and wherein negative lens is meniscus shaped lens, and positive lens is lenticular lens; Rear constituent element is focal power is positive positive and negative cemented doublet, and wherein positive element is lenticular lens, and negative element is meniscus shaped lens; It is positive meniscus shaped lens that multiplying power regulates constituent element to be focal power.
Front constituent element and rear constituent element be spaced apart forward and backward constituent element focal length sum; Multiplying power focusing constituent element is positioned in the middle of forward and backward constituent element, and the interval of itself and forward and backward constituent element is respectively the focal length value of front and back constituent element.
In front constituent element, negative lens is fixed by front constituent element trim ring close contact.
In rear constituent element, negative lens is fixed by rear constituent element trim ring close contact.
The invention has the beneficial effects as follows: because multiplying power regulates constituent element glazed thread height low, therefore it moves forward and backward does not affect light transmition angle, thus be in course of adjustment and can remain the image space heart far away, stigma mass center measurement precision is not affected by the axial positioning errors of lenticule and camera lens, camera lens and camera.
Accompanying drawing explanation
Fig. 1 is traditional Hartmann's relaying camera lens principle.
Fig. 2 is the sampling situations of stigma on CCD camera target surface when shared by sub-aperture, pixel count is not integer.
Fig. 3 is the Hartmann sensor relay lens header structure schematic diagram of band multiplying power micro-adjusting mechanism of the present invention.
Fig. 4 is embodiment Gaussian optics structural drawing, and when multiplying power is from 0.7 ~ 0.72 ~ 0.74 change, multiplying power regulates the contrast of constituent element Gaussian optics position.
Fig. 5 is the Hartmann sensor relaying camera lens actual light line structure of band multiplying power micro-adjusting mechanism, when multiplying power is from 0.7 ~ 0.72 ~ 0.74 change, and the contrast of actual light line structure.
Fig. 6 is the point range figure under the different object plane height of relay optical system respectively when multiplying power 0.7,0.72,0.74 three position.
Fig. 7 is the relay optical system distortion curve when multiplying power 0.7,0.72,0.74 three position respectively.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further details.
As shown in Figure 3, with the Hartmann sensor relaying camera lens of multiplying power micro-adjusting mechanism, front constituent element 2 in this relaying camera lens, rear constituent element 10 and adjustment constituent element 5 are arranged in relaying lens barrel 3, front constituent element 2 is fixed by front constituent element trim ring 1, rear constituent element 10 is arranged in rear constituent element seat 9, and fixed by rear constituent element trim ring 11, regulate constituent element lens 5 to be arranged on and regulate on constituent element seat 7, fixed by adjustment constituent element trim ring 4, regulate constituent element reversed column 8 can move forward and backward adjustment constituent element lens 5 by stirring, realize the fine setting of relaying lens ratio, after adjusting to accurate location, tighten and regulate constituent element holding screw 6 to realize the fixing of adjustment constituent element.
Front constituent element 2 for focal power be positive negative, positive cemented doublet, wherein negative lens 2-1 is meniscus shaped lens, and positive lens 2-2 is lenticular lens; Rear constituent element 10 for focal power be positive positive and negative cemented doublet, wherein positive element 10-1 is lenticular lens, and negative element 10-2 is meniscus shaped lens; Multiplying power regulate constituent element 5 for focal power be positive meniscus shaped lens.
In front constituent element 2, negative lens 2-1 is fixed by front constituent element trim ring 1 close contact; Lens in rear constituent element 10 are arranged in rear constituent element seat 9, are fixed with negative lens 10-2 close contact by rear constituent element trim ring 11.
Front constituent element 2 is spaced apart forward and backward constituent element focal length sum with rear constituent element 10; Multiplying power focusing constituent element 5 is positioned in the middle of forward and backward constituent element, and the interval of itself and forward and backward constituent element is respectively the focal length value of front and back constituent element.
Embodiment:
With the Hartmann sensor relaying camera lens of multiplying power micro-adjusting mechanism, parameter and technical requirement are:
(1) microlens array size of sub-aperture: 0.2mm;
(2) focal length of micro-lens array: 7mm;
(3) CCD picture dot size: 24um × 24um;
(4) sub-aperture number: 35 × 35;
(5) picture dot number shared by single sub-aperture: 6 × 6;
(6) relaying lens ratio: 0.72, and ± 0.02 is adjustable;
(7) wave band: 486nm ~ 700nm;
(8) overall length: <150mm;
Relaying camera lens object-side numerical aperture NA=0.015 is obtained, object height 5mm by above requirement;
In design process, first carry out Gaussian optics calculating, obtain paraxial optics parameter as follows, Gaussian optics structure, as shown in Figure 4:
1) front constituent element focal length: 50mm;
2) constituent element focal length: 34.6mm afterwards;
3) multiplying power regulates constituent element focal length: 62mm;
4) lenticule focal plane and front constituent element interval: 26.5mm;
5) front constituent element and multiplying power regulate constituent element interval: 50mm;
6) multiplying power regulates constituent element and rear constituent element interval: 34.6mm;
7) constituent element and target surface interval: 26.6mm afterwards;
8) multiplying power regulates about ± 1.7mm range regulation before and after constituent element.
Gaussian optics carries out thick lens design after calculating, and forward and backward constituent element all adopts two glued construction, and the negative element in balsaming lens is positioned at outside, adopts high index of refraction, high-dispersion glass, and positive element is positioned at inner side, adopts low-refraction, low dispersion; By cemented surface correction position aberration, cemented surface bends towards diaphragm; Regulate constituent element to adopt positive light coke simple lens, adopt crown glass material; In design process, optical element structure still keeps near symmetrical, but due to system multiplying power be not 1, therefore need the change of suitable mistake symmetry, correct symmetrical disappear mutually coma, lateral chromatic aberration and distortion, and correct the spherical aberration of symmetrical superposition, astigmatism and the curvature of field by symmetrical change.
As shown in Figure 4, be embodiment Gaussian optics structural drawing, when three width figure describe multiplying power from 0.7 ~ 0.72 ~ 0.74 change, multiplying power regulates the contrast of constituent element Gaussian optics position.Can find out, because multiplying power regulates constituent element 5 glazed thread height low, therefore it movable does not affect light transmition angle, thus is in course of adjustment and can remains the image space heart far away, and stigma mass center measurement precision is not affected by the axial positioning errors of lenticule and camera lens, camera lens and camera; In addition, when multiplying power is from 0.7 ~ 0.72 ~ 0.74 change, multiplying power regulates constituent element only to move a small amount of distance.
As shown in Figure 5, be the Hartmann sensor relaying camera lens actual light line structure of band multiplying power micro-adjusting mechanism, when three width figure describe multiplying power from 0.7 ~ 0.72 ~ 0.74 change, the contrast of actual light line structure, emphasis is the position versus that multiplying power regulates constituent element.Embodiment light channel structure can find out that relaying camera lens is near symmetrical structure, but due to system multiplying power be not 1, because this has been the change of suitable mistake symmetry in order to correct vertical axial aberration.
As shown in Figure 6, be the point range figure under the different object plane height of relay optical system respectively when multiplying power 0.7,0.72,0.74 three position.Can find out, when system changes between multiplying power 0.7 ~ 0.74, whole-view field imaging quality all reaches diffraction limit.
As shown in Figure 7, be the distortion curve of relay optical system respectively when multiplying power 0.7,0.72,0.74 three position.Can find out, when system changes between multiplying power 0.7 ~ 0.74, peripheral field distortion is less than 0.1%, meets the requirement be accurately mapped to stigma position on CCD.
The present embodiment optical parametric is as table 1:
Table 1:
Design result: relay system conjugate distance of the present invention is from 140mm, and multiplying power regulates constituent element amount of movement 3.4mm.System imaging quality reaches diffraction limit, and distortion is less than 0.1%.
Claims (5)
1. be with the Hartmann sensor relaying camera lens of multiplying power micro-adjusting mechanism, it is characterized in that,
Front constituent element (2) in this relaying camera lens, constituent element (5) and rear constituent element (10) is regulated to be arranged in relaying lens barrel (3) from left to right, front constituent element (2) is fixed by front constituent element trim ring (1), rear constituent element (10) is arranged in rear constituent element seat (9), and fixed by rear constituent element trim ring (11), regulate constituent element lens (5) to be arranged on and regulate on constituent element seat (7), fixed by adjustment constituent element trim ring (4), regulate constituent element reversed column (8) that adjustment constituent element lens (5) can be moved forward and backward by stirring, realize the fine setting of relaying lens ratio, after adjusting to accurate location, tighten and regulate constituent element holding screw (6) to realize the fixing of adjustment constituent element.
2. the Hartmann sensor relaying camera lens of band multiplying power micro-adjusting mechanism according to claim 1, it is characterized in that, front constituent element (2) for focal power be positive negative, positive cemented doublet, wherein negative lens (2-1) is meniscus shaped lens, and positive lens (2-2) is lenticular lens; Rear constituent element (10) for focal power be positive positive and negative cemented doublet, wherein positive element (10-1) is lenticular lens, and negative element (10-2) is meniscus shaped lens; Multiplying power regulate constituent element (5) for focal power be positive meniscus shaped lens.
3. the Hartmann sensor relaying camera lens of band multiplying power micro-adjusting mechanism according to claim 1, is characterized in that, front constituent element (2) is spaced apart forward and backward constituent element focal length sum with rear constituent element (10); Multiplying power focusing constituent element (5) is positioned in the middle of forward and backward constituent element, and the interval of itself and forward and backward constituent element is respectively the focal length value of front and back constituent element.
4. the Hartmann sensor relaying camera lens of band multiplying power micro-adjusting mechanism according to claim 2, is characterized in that, in front constituent element (2), negative lens (2-1) is fixed by front constituent element trim ring (1) close contact.
5. the Hartmann sensor relaying camera lens of band multiplying power micro-adjusting mechanism according to claim 2, is characterized in that, in rear constituent element (10), negative lens (10-2) is fixed by rear constituent element trim ring (11) close contact.
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Cited By (2)
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| CN106772962A (en) * | 2016-12-28 | 2017-05-31 | 中国科学院长春光学精密机械与物理研究所 | A kind of active optics Hartmann focusing lens |
| CN111965779A (en) * | 2020-07-20 | 2020-11-20 | 天津大学 | Scanning type large-area array micro-lens array structure convenient to align |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106772962A (en) * | 2016-12-28 | 2017-05-31 | 中国科学院长春光学精密机械与物理研究所 | A kind of active optics Hartmann focusing lens |
| CN111965779A (en) * | 2020-07-20 | 2020-11-20 | 天津大学 | Scanning type large-area array micro-lens array structure convenient to align |
| CN111965779B (en) * | 2020-07-20 | 2022-06-10 | 天津大学 | Scanning type large-area array micro-lens array structure convenient to align |
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