GB1373241A - Method and apparatus for detecting defects or irregularities in glass sheet - Google Patents
Method and apparatus for detecting defects or irregularities in glass sheetInfo
- Publication number
- GB1373241A GB1373241A GB5050571A GB5050571A GB1373241A GB 1373241 A GB1373241 A GB 1373241A GB 5050571 A GB5050571 A GB 5050571A GB 5050571 A GB5050571 A GB 5050571A GB 1373241 A GB1373241 A GB 1373241A
- Authority
- GB
- United Kingdom
- Prior art keywords
- photo
- light
- defects
- multiplier
- output
- 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.)
- Expired
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
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/892—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the flaw, defect or object feature examined
- G01N21/896—Optical defects in or on transparent materials, e.g. distortion, surface flaws in conveyed flat sheet or rod
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
1373241 Detecting defects in sheet glass CENTRAL GLASS CO Ltd 29 Oct 1971 [31 Oct 1970] 50505/71 Heading G1A In a device for detecting defects in sheet glass a rotary polyhedral mirror 14 causes a laser beam 16 to scan the moving glass sheet transversely of its direction of motion and the transmitted light (or reflected light see Fig.7) is incident on a photo-multiplier 22 after passing via a window W2 and a fibre optic light converger 21. The photo-multipliers output is amplified and passed to a peak value discriminator circuit 32 connected to a reference voltage source so that when the photo-multipliers output decreases below a predetermined voltage level, a pulse appears at the output of the discriminator. The pulses are amplified and passed to a control unit which may activate an alarm. The location of the defects may be determined by determining the relation of the time tl of the defects appearance relative to the scan period T of the laser beam. In another embodiment, Fig.7, light from a laser source 11 is split up into two scanning beams by an oscillating mirror 17, a beam-splitter 19 and mirrors 18, 18', 18", and the beams are directed as shown on to opposite surfaces of the glass sheet 5. The reflected light from each surface is received by a corresponding set of a lens 21 a light filter 24 and a photo-multiplier 22. The photo-multiplier output may then be processed as in the previous embodiment.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9559270A JPS5036795B1 (en) | 1970-10-31 | 1970-10-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1373241A true GB1373241A (en) | 1974-11-06 |
Family
ID=14141832
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5050571A Expired GB1373241A (en) | 1970-10-31 | 1971-10-29 | Method and apparatus for detecting defects or irregularities in glass sheet |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS5036795B1 (en) |
BE (1) | BE774740A (en) |
DE (1) | DE2154086C3 (en) |
FR (1) | FR2110158A5 (en) |
GB (1) | GB1373241A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2000285A (en) * | 1977-06-24 | 1979-01-04 | Research Technology | Film thickness detector |
CN113167561A (en) * | 2018-09-19 | 2021-07-23 | 康宁股份有限公司 | Method for measuring edge defect size of glass sheet using edge defect gauge and corresponding edge defect gauge |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4402607A (en) * | 1980-05-16 | 1983-09-06 | Gca Corporation | Automatic detector for microscopic dust on large-area, optically unpolished surfaces |
DE3800053A1 (en) * | 1988-01-04 | 1989-07-13 | Sick Optik Elektronik Erwin | OPTICAL ERROR INSPECTION DEVICE |
DE3806384A1 (en) * | 1988-02-29 | 1989-09-07 | Feldmuehle Ag | Method and device for testing running transparent webs |
JP4884540B2 (en) * | 2010-01-21 | 2012-02-29 | 東京エレクトロン株式会社 | Substrate inspection apparatus and substrate inspection method |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1036627A (en) * | 1962-05-02 | 1966-07-20 | Licentia Gmbh | An apparatus for the photo-electric scanning of moving objects |
-
1970
- 1970-10-31 JP JP9559270A patent/JPS5036795B1/ja active Pending
-
1971
- 1971-10-29 DE DE19712154086 patent/DE2154086C3/en not_active Expired
- 1971-10-29 GB GB5050571A patent/GB1373241A/en not_active Expired
- 1971-10-29 BE BE774740A patent/BE774740A/en not_active IP Right Cessation
- 1971-10-29 FR FR7139122A patent/FR2110158A5/fr not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2000285A (en) * | 1977-06-24 | 1979-01-04 | Research Technology | Film thickness detector |
GB2000285B (en) * | 1977-06-24 | 1982-01-27 | Research Technology | Film thickness detector |
CN113167561A (en) * | 2018-09-19 | 2021-07-23 | 康宁股份有限公司 | Method for measuring edge defect size of glass sheet using edge defect gauge and corresponding edge defect gauge |
CN113167561B (en) * | 2018-09-19 | 2023-12-22 | 康宁股份有限公司 | Method for measuring the edge defect size of a glass sheet using an edge defect gauge and corresponding edge defect gauge |
Also Published As
Publication number | Publication date |
---|---|
DE2154086B2 (en) | 1974-05-16 |
JPS5036795B1 (en) | 1975-11-27 |
DE2154086C3 (en) | 1975-01-23 |
BE774740A (en) | 1972-05-02 |
FR2110158A5 (en) | 1972-05-26 |
DE2154086A1 (en) | 1972-05-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |