EP0264427A1 - Method and apparatus for identifying particulate matter - Google Patents
Method and apparatus for identifying particulate matterInfo
- Publication number
- EP0264427A1 EP0264427A1 EP87902951A EP87902951A EP0264427A1 EP 0264427 A1 EP0264427 A1 EP 0264427A1 EP 87902951 A EP87902951 A EP 87902951A EP 87902951 A EP87902951 A EP 87902951A EP 0264427 A1 EP0264427 A1 EP 0264427A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- focal plane
- particulate matter
- plane array
- focussing
- array
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/94—Investigating contamination, e.g. dust
-
- 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
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/0606—Investigating concentration of particle suspensions by collecting particles on a support
- G01N15/0612—Optical scan of the deposits
-
- 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
- G01N15/0227—Investigating particle size or size distribution by optical means, e.g. by light scattering, diffraction, holography or imaging using imaging, e.g. a projected image of suspension; using holography
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N2021/4704—Angular selective
- G01N2021/4711—Multiangle measurement
- G01N2021/4721—Multiangle measurement using a PSD
Definitions
- the present invention relates to a method and apparatus for identifying surface particulate contamination and, in particular, to contemporaneous witnessing and identification of such surface particulate contamination.
- Cleanliness or the lack of contamination in opti ⁇ cal systems is proportional to the quality of sensing and detection obtained.
- structural components and piece parts Prior to assembly, structural components and piece parts are normally washed in special spraying facilities equipped for the collection of the solvent run-off. The solvent is then filtered for collection and optically counting of the residue of particles.
- witness plate for example, a one-square foot sheet of Kapton to accompany the piece.
- the wash technique is subsequently applied to this witness sample.
- Witness plate techniques using smaller optical mirrors or black glass, one inch or greater lend them ⁇ selves to direct optical counting of the dust, such as is obtained by a Saab photometer, which provides an integrated scatter roughly proportional to the commu- nitive area covered by dust.
- Experimental apparatus utilized a high resolution photo of a witness plate taken with a dedicated camera, with special grazing incidence lighting.
- the present invention overcomes and avoids these and other problems by providing a witness plate used to collect samples of contaminants within a chosen environment.
- An optical imager focuses the illuminated contaminants onto a detector focal plane, such as a charge-coupled detector array.
- the information detected is then processed by a computer, which is programmed to provide such identification as sizes and count of the contaminants.
- an apparatus 10 for viewing particu- late contaminants is positioned to view a witness plate 12 onto which the contaminants are to be deposited.
- Witness plate 12 is placed in and adja ⁇ cent to optical equipment where contamination is desired to be monitored.
- a light source 14 is positioned to direct light 16 at a grazing angle with respect to the witness plate, so that the particles only are well illuminated.
- Apparatus 10 includes a high resolution lens system 18 which is secured to a housing 20 by an adjustable connection 22, such as a bellows. Positioned at the far end of housing 20 is a charge-coupled device (CCD) array 24 of conventional construction which defines a focal plane 25. Bellows 22 is adjusted in order to sharply focus the images of the particulate contamination onto the focal plane of array 24.
- CCD charge-coupled device
- Such adjustment may be obtained by utilizing a flip mirror 26 which is pivotable about point 28 so that the contaminants may be focussed on a viewing screen 30.
- focusing is conventional, similar to that of a single lens reflex camera. Once the focussing is sharply defined on screen 30, mirror 26 is pivoted so that the image will then be focussed on the focal plane at charge coupled device array 24.
- the images sensed on array 24 are electrically conducted to a computer 32 of conventional design, e.g. , Hewlett Packard 9836.
- the computer quickly calculates the sizes and the count of the particulate contaminants, which calculation and identification are then displayed or otherwise placed in graphic form.
- the focal plane preferably is a CCD array, which may be either a stationary array or a commercially available line array which sweeps through the image from plate 12.
- CCD array which may be either a stationary array or a commercially available line array which sweeps through the image from plate 12.
- Such commercially available units currently provide about 1,600 image elements on a line, swept through 2,000 positions automatically.
Abstract
Une plaque témoin (12) récupère la poussière ou autre matière particulaire dans un environnement contrôlé. La plaque est éclairée par une source lumineuse (14) de sorte que seule la poussière brille, et provoque la focalisation de spots brillants sur un plan focal (25) défini par un réseau CCD (24). Le plan focal est lu sur un ordinateur (32) qui est programmé pour déterminer les dimensions et le nombre des particules de poussière.A witness plate (12) collects dust or other particulate matter in a controlled environment. The plate is illuminated by a light source (14) so that only the dust shines, and causes bright spots to focus on a focal plane (25) defined by a CCD array (24). The focal plane is read on a computer (32) which is programmed to determine the size and number of the dust particles.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US85956486A | 1986-05-05 | 1986-05-05 | |
US859564 | 1986-05-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0264427A1 true EP0264427A1 (en) | 1988-04-27 |
Family
ID=25331216
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87902951A Withdrawn EP0264427A1 (en) | 1986-05-05 | 1987-03-27 | Method and apparatus for identifying particulate matter |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0264427A1 (en) |
JP (1) | JPS63503243A (en) |
IL (1) | IL82107A0 (en) |
WO (1) | WO1987007024A1 (en) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DK163538C (en) * | 1990-03-22 | 1992-08-03 | Abk Bygge & Miljoeteknik | PROCEDURE AND CLEANING CONTROL MEASUREMENT |
GB2249829A (en) * | 1990-11-13 | 1992-05-20 | Powergen Public Limited Compan | Measurement of carbon in ash |
FR2753531B1 (en) * | 1996-09-19 | 1998-10-16 | Snecma | METHOD FOR ADJUSTING THE ILLUMINATION LEVEL OF A SAMPLE IN A GRANULOMETRY SYSTEM BY IMAGE ANALYSIS |
GB9717658D0 (en) * | 1997-08-21 | 1997-10-22 | Tioxide Group Services Ltd | Particle dispersion determination |
FR2770296B1 (en) * | 1997-10-29 | 2000-01-07 | Lorraine Laminage | METHOD FOR ANALYZING ATMOSPHERIC PARTICLES AND APPARATUS FOR ANALYZING ATMOSPHERIC PARTICLES FOR CARRYING OUT SUCH A METHOD |
FR2795516B1 (en) * | 1999-06-28 | 2003-08-08 | Univ Henri Poincare Nancy I | AUTOMATIC OBJECT ANALYSIS AND COUNTING DEVICE AND DATA PROCESSING METHOD |
DE10016832C2 (en) * | 2000-04-03 | 2002-06-20 | Winfried Labuda | Substrate for the visualization of particles and / or layers of material attached to it |
WO2002044693A1 (en) * | 2000-11-28 | 2002-06-06 | Imeco Automazioni S.R.L. | Apparatus for analyzing ground products |
JP2007304065A (en) * | 2006-05-15 | 2007-11-22 | Omron Corp | Foreign substance detector, foreign substance detecting method, foreign substance detecting program, and recording medium with the program stored |
GB2479843B (en) | 2007-05-18 | 2012-02-29 | Malvern Instr Ltd | Method and apparatus for dispersing a sample of particulate material |
FR2922019B1 (en) * | 2007-10-09 | 2009-11-27 | Novacyt | AUTOMATED CELL DENSITY ADJUSTMENT METHOD FOR REALIZING AN ANALYTICAL PLATE |
US10739241B2 (en) | 2014-12-17 | 2020-08-11 | Schlumberger Technology Corporation | Test apparatus for estimating liquid droplet fallout |
CN109932292A (en) * | 2019-03-29 | 2019-06-25 | 苏州精濑光电有限公司 | A kind of dust fall detection method |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1384115A (en) * | 1963-11-22 | 1965-01-04 | Commissariat Energie Atomique | Liquid particle detector entrained by circulating gas |
SE315760B (en) * | 1966-04-27 | 1969-10-06 | Saab Ab | |
JPS4890590A (en) * | 1972-03-03 | 1973-11-26 | ||
JPS5610580B2 (en) * | 1974-03-14 | 1981-03-09 | ||
US4075462A (en) * | 1975-01-08 | 1978-02-21 | William Guy Rowe | Particle analyzer apparatus employing light-sensitive electronic detector array |
JPS5293380A (en) * | 1976-02-02 | 1977-08-05 | Teijin Ltd | Image discriminator |
JPS52156694A (en) * | 1976-06-22 | 1977-12-27 | Tetsuo Yoshida | Apparatus for grain size measurements |
JPS6023293B2 (en) * | 1979-04-12 | 1985-06-06 | 株式会社島津製作所 | Particle size distribution automatic measurement method |
JPS56162037A (en) * | 1980-05-19 | 1981-12-12 | Nec Corp | Detection for foreign matter on surface |
JPS5876740A (en) * | 1981-10-15 | 1983-05-09 | インタ−ナシヨナル・リモ−ト・イメ−ジング・システムズ | Method of analyzing grain of dilute liquid sample |
JPS5912342A (en) * | 1982-07-13 | 1984-01-23 | Hitachi Ltd | Device for detecting foreign matter |
JPS5915807A (en) * | 1982-07-20 | 1984-01-26 | Furukawa Electric Co Ltd:The | Measuring method for surface of object |
JPS59184840A (en) * | 1983-04-06 | 1984-10-20 | Mitsubishi Chem Ind Ltd | Method and device for measuring dust in liquid |
-
1987
- 1987-03-27 JP JP62502313A patent/JPS63503243A/en active Pending
- 1987-03-27 EP EP87902951A patent/EP0264427A1/en not_active Withdrawn
- 1987-03-27 WO PCT/US1987/000652 patent/WO1987007024A1/en not_active Application Discontinuation
- 1987-04-03 IL IL82107A patent/IL82107A0/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO8707024A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1987007024A1 (en) | 1987-11-19 |
IL82107A0 (en) | 1987-10-30 |
JPS63503243A (en) | 1988-11-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19871203 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB IT |
|
17Q | First examination report despatched |
Effective date: 19881011 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19890222 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: CHAMPETIER, ROBERT, J. |