WO2001053800A2 - Photometer and a method for measuring and analysing particles - Google Patents
Photometer and a method for measuring and analysing particles Download PDFInfo
- Publication number
- WO2001053800A2 WO2001053800A2 PCT/DE2000/004683 DE0004683W WO0153800A2 WO 2001053800 A2 WO2001053800 A2 WO 2001053800A2 DE 0004683 W DE0004683 W DE 0004683W WO 0153800 A2 WO0153800 A2 WO 0153800A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- measuring
- particles
- photometer according
- photometer
- memory
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N2015/0023—Investigating dispersion of liquids
- G01N2015/003—Investigating dispersion of liquids in liquids, e.g. emulsion
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N2015/0042—Investigating dispersion of solids
- G01N2015/0046—Investigating dispersion of solids in gas, e.g. smoke
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means, e.g. by light scattering, diffraction, holography or imaging
- G01N15/0211—Investigating a scatter or diffraction pattern
- G01N2015/0216—Investigating a scatter or diffraction pattern from fluctuations of diffraction pattern
Definitions
- the invention relates to the field of measurement technology and relates to a photometer for measuring size and / or concentration and for analyzing particles in the micro and submicrometer range, and to a method for measuring and analyzing particles
- Photometers of the type mentioned are basically known. They have a light source and at least one photodiode or another sensor for measuring the light output (hereinafter referred to as photodetector) and at least one optical system for bundling the beams
- the photometric determination of an average particle size in suspensions with nanometer particles is limited by another phenomenon.
- increasing volume-specific surface area of the particles i.e. decreasing average particle size
- the optical effect of a particle described by the extinction coefficient decreases sharply.
- very many small particles preferably ⁇ 1 ⁇ m
- the object of the invention is to provide a photometer and a method for precise measurements and analyzes of particles in the micrometer and submicron range in suspensions and aerosols
- the object is achieved by a photometer with an illumination source, a measuring chamber, at least one photodetector, optics and means for measuring and analyzing the electrical signal of the at least one photodetector, in which the size of the measuring zone in cross section in the measuring plane at the height of the measuring chamber of the illuminating beam, which is imaged on the sensor by the optics of the at least one photodetector, or the cross section of the illuminating beam itself, approximately, if possible in a ratio of one tenth to ten times the maximum particle size, and the electrical signal of the at least one Photodetector is present at the input of a memory
- the object is further achieved by a method in which in a photometer, which contains at least one illumination source, a measuring chamber, a photodetector, optics and means for measuring and analyzing electrical signals from the photodetector, in the measuring plane at the height of the measuring chamber, particle signals from Photodetector recorded, forwarded to a memory and then both statistically and / or stochastically evaluated integrally
- the cycle time of the memory is approximately 1/10 of the average residence time of the particles in the measuring zone, the different optical effects of differently sized particles in the micro and submicron range when passing through the Measuring zone recorded differentiated From the recorded, preferably digitized signal curves, characteristic pulse curves of large particles as well as fluctuating elongations (fluctuations) of larger particles as well as constant low turbidity due to many small particles are visible or via evaluation with a computer, which is preferably connected to the time-controlled memory is made visible
- the turbidity measurement is no longer obtained by integrating the light output over a large cross section compared to the particle dimensions, but by averaging Many, separately recorded individual signals This feature is not an advantage in itself.
- the advantages result from the fact that the same individual signals, as will be shown in the exemplary embodiment, can also be evaluated in other ways, and as a result the particles can be analyzed comprehensively and clearly
- a laser diode is preferably used as the illumination source. With it, the small measuring zone can be illuminated very brightly.
- the detection optics of transmission and backscattering are aligned with the illuminated measuring zone with dimensions of a few micrometers
- the irradiated light output is preferably regulated or readjusted.To this end, it is measured with a reference detector and compared with the detector signals. If the transmission signal is too low compared to the reference signal due to the increasing concentration of nanometer particles, the light output can be increased to values which would result in an overload of the particle-free measuring space Transmission detectors were used If no transmission can be measured despite the increase in power, then the backscattering delivers significant values. In this way, instantaneous values of extinction and / or backscattering can be measured in a particle concentration range from about 0.1 to about 20 Voi%
- the signal curve of the transmission or backscatter recorded with a high resolution can be evaluated in various ways
- the signal curves can be recorded and evaluated over the entire measuring time.It is also possible, however, to save and evaluate only short intervals during the measurement and to reset the memory to zero.For evaluation, for example, the interval mean value can be formed from the stored values of each interval and separated can be saved in order to ultimately form the mean value of the measurement from the interval mean values. The accuracy of the measurement increases with the same electronic effort. In industrial measurements, the process can be monitored for a long period of time according to a predetermined time regime
- the properties of the photometer contained in the invention measuring average particle sizes in real time and the magnitude of their integration limits and monitoring or identifying rare particles, in conjunction with the wide particle concentration range, offer all the prerequisites for online process measurement (without sampling and dilution)
- FIG. 1 A photometer designed according to the invention is shown schematically in FIG. 1
- the beam from a laser diode 1 falls through a diaphragm 2 onto a semitransparent mirror 3. In the beam direction it strikes a reference photodetector 10. Perpendicular to this, it forms the illuminating beam through the measuring chamber 6 (here a flow cell). It passes through a quarter-wave plate 4, an optical system 5, the flow-through cuvette 6 and an aperture 7 A photodetector 8 for measuring the transmission is arranged in the axis of the illumination beam. The light scattered back by the particles in the flow-through cuvette 6 is measured with a further photodetector 9. The quarter-wave plate 4 thereby cuts through Phase shift towards and reflected light
- the signal curve measured with the photodetectors 8 and 9 is stored with a digital storage oscilloscope 11 and evaluated with a computer 12 (in the illustration only the photodetector 8 is connected to the storage oscillograph 11).
- the particles to be measured are in suspension, which flows through the flow cuvette in a known manner (indicated here with two arrows perpendicular to the illuminating beam)
- the already strongly bundled laser beam is focused on the cuvette with the optics 5.
- the optics of the photodetectors 8 and 9 are directed in the measuring plane (at the height of the cuvette 6) to a part of the cross-section of the illumination beam and each detect an illuminated measuring zone of a few micrometers of which Large is set approximately to the maximum particle size
- the signal evaluation provides information about the integration limits of the integrally averaged particle sizes.
- the variants 1 to 3 provide information as to whether the lower integration limit is in the nanometer range and whether the upper one is in the nano- or micrometer range.
- the micrometer range is up limited by the measuring zone size Exceeding provides significant single impulses as a result of the stochastic single pulse evaluation, which has not yet been dealt with
- the stochastic single pulse evaluation provides the opportunity to distinguish rare coarse contamination particles ("specks", spray particles), air bubbles or coarse particle flakes (porous agglomerates)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00990593A EP1252499A2 (en) | 2000-01-18 | 2000-12-29 | Photometer and a method for measuring and analysing particles |
AU2001230023A AU2001230023A1 (en) | 2000-01-18 | 2000-12-29 | Photometer and a method for measuring and analysing particles |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2000101701 DE10001701B4 (en) | 2000-01-18 | 2000-01-18 | photometer |
DE10001701.0 | 2000-01-18 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2001053800A2 true WO2001053800A2 (en) | 2001-07-26 |
WO2001053800A3 WO2001053800A3 (en) | 2002-03-14 |
Family
ID=7627749
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2000/004683 WO2001053800A2 (en) | 2000-01-18 | 2000-12-29 | Photometer and a method for measuring and analysing particles |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1252499A2 (en) |
AU (1) | AU2001230023A1 (en) |
DE (1) | DE10001701B4 (en) |
WO (1) | WO2001053800A2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2859531B1 (en) * | 2003-09-08 | 2006-02-10 | Univ Nantes | METHOD AND DEVICE FOR ONLINE MEASUREMENT OF THE CHARACTERISTICS OF A LIQUID-LIQUID OR LIQUID-SOLID DISPERSE SYSTEM CONTAINED IN A MAIN INSTALLATION |
DE102011115368A1 (en) | 2011-10-10 | 2013-04-11 | J. Engelsmann Ag | Method and device for determining the size of particles in screenings |
CN103940709A (en) * | 2014-05-06 | 2014-07-23 | 南京中科神光科技有限公司 | Real-time microbial particle counter |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4420256A (en) * | 1979-06-15 | 1983-12-13 | Svenska Traforskningsinstitutet | Dust measurement |
US4529309A (en) * | 1981-10-01 | 1985-07-16 | Svenska Traforskningsinstitutet | Method for determining the average radius and/or the average length of particles carried by a flowing medium |
US4752131A (en) * | 1984-04-04 | 1988-06-21 | Basf Aktiengesellschaft | Laser-optical arrangement for measuring the degree of dispersion in flowing systems |
CH677406A5 (en) * | 1988-07-20 | 1991-05-15 | Guido Bugmann C O Nelly Bugman | Measuring technique for size of particles in medium - using varying transmission coefficient which is function of particle size |
EP0582320A2 (en) * | 1989-07-10 | 1994-02-09 | FLADDA, Gerdt Heinrich | Measuring apparatus and method |
DE19711494C1 (en) * | 1997-03-19 | 1998-10-15 | Ulrich Prof Dr Ing Riebel | Particle size measurement method |
US5835211A (en) * | 1996-03-28 | 1998-11-10 | Particle Sizing Systems, Inc. | Single-particle optical sensor with improved sensitivity and dynamic size range |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5426501A (en) * | 1993-01-06 | 1995-06-20 | Laser Sensor Technology, Inc. | Apparatus and method for particle analysis |
-
2000
- 2000-01-18 DE DE2000101701 patent/DE10001701B4/en not_active Expired - Fee Related
- 2000-12-29 AU AU2001230023A patent/AU2001230023A1/en not_active Abandoned
- 2000-12-29 EP EP00990593A patent/EP1252499A2/en not_active Ceased
- 2000-12-29 WO PCT/DE2000/004683 patent/WO2001053800A2/en active Application Filing
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4420256A (en) * | 1979-06-15 | 1983-12-13 | Svenska Traforskningsinstitutet | Dust measurement |
US4529309A (en) * | 1981-10-01 | 1985-07-16 | Svenska Traforskningsinstitutet | Method for determining the average radius and/or the average length of particles carried by a flowing medium |
US4752131A (en) * | 1984-04-04 | 1988-06-21 | Basf Aktiengesellschaft | Laser-optical arrangement for measuring the degree of dispersion in flowing systems |
CH677406A5 (en) * | 1988-07-20 | 1991-05-15 | Guido Bugmann C O Nelly Bugman | Measuring technique for size of particles in medium - using varying transmission coefficient which is function of particle size |
EP0582320A2 (en) * | 1989-07-10 | 1994-02-09 | FLADDA, Gerdt Heinrich | Measuring apparatus and method |
US5835211A (en) * | 1996-03-28 | 1998-11-10 | Particle Sizing Systems, Inc. | Single-particle optical sensor with improved sensitivity and dynamic size range |
DE19711494C1 (en) * | 1997-03-19 | 1998-10-15 | Ulrich Prof Dr Ing Riebel | Particle size measurement method |
Also Published As
Publication number | Publication date |
---|---|
AU2001230023A1 (en) | 2001-07-31 |
WO2001053800A3 (en) | 2002-03-14 |
DE10001701B4 (en) | 2006-03-30 |
DE10001701A1 (en) | 2001-07-26 |
EP1252499A2 (en) | 2002-10-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE60218074T2 (en) | flow cytometer | |
EP3521810B1 (en) | Analyser for the determination of fine dust | |
EP2411787B1 (en) | Apparatus for determining particle sizes | |
EP2194368B1 (en) | Sensor system for detecting and specifying individual particles in a fluid | |
DE10338256A1 (en) | Particle counter with stripe laser diode | |
DE2502289A1 (en) | METHOD AND DEVICE FOR MEASURING THE SURFACE Roughness | |
DE3048053C2 (en) | ||
DE1802269A1 (en) | Method for measuring the concentration and / or size of particulate matter | |
DE2609246A1 (en) | METHOD AND ARRANGEMENT FOR MEASURING THE MASS DENSITY OF PARTICLES SUSPENDED IN A FLOWING MEDIUM | |
DE4228388B4 (en) | Device for determining particle sizes and / or particle size distributions | |
DE69819227T2 (en) | Device and method for measuring turbidity | |
EP1176414B1 (en) | Process and device for determining of physical collective parameters of particles in gas | |
EP4085243A1 (en) | Method and device for determining features of particles by multiparametric capture of scattered light and extinction signals | |
DE102015217700B3 (en) | Method for determining the mean radius of gyration of particles with a size of less than or equal to 200 nm in a suspension and apparatus for carrying out the method | |
WO2001053800A2 (en) | Photometer and a method for measuring and analysing particles | |
DE4408226C2 (en) | Measuring device for the process-related determination of the roughness of technical surfaces by evaluating di- or polychromatic speckle patterns | |
WO2011050932A1 (en) | Measuring device for measuring emissions in a particle mass concentration in a gas to be measured, in particular in a combustion emission gas | |
EP0467127A2 (en) | Method and device for optically detecting and evaluating scattered light signals | |
DE2134937C2 (en) | Photo analysis for liq. suspension contg. fine particles - uses summed signals corresponding to different optical reactions for each particle | |
DE102008064665A1 (en) | Particle size analyzer | |
WO2015028365A1 (en) | Analysis method for determining the types and concentrations of biological particles | |
EP1883802B1 (en) | Adaptive signal interpretation for fbrm measurement apparatus | |
DE102006018287B4 (en) | Apparatus and method for the spectral analytical evaluation of materials or objects in a material or object stream | |
EP0968408A2 (en) | Method of measuring particle sizes | |
DE10027439B4 (en) | Method and device for evaluating topographic parameters of periodic surface structures |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A2 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CR CU CZ DE DK DM DZ EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A2 Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
AK | Designated states |
Kind code of ref document: A3 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CR CU CZ DE DK DM DZ EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A3 Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2000990593 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 2000990593 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: JP |