GB1373241A - Method and apparatus for detecting defects or irregularities in glass sheet - Google Patents

Method and apparatus for detecting defects or irregularities in glass sheet

Info

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
Application number
GB5050571A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Central Glass Co Ltd
Original Assignee
Central Glass Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Central Glass Co Ltd filed Critical Central Glass Co Ltd
Publication of GB1373241A publication Critical patent/GB1373241A/en
Expired legal-status Critical Current

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.
GB5050571A 1970-10-31 1971-10-29 Method and apparatus for detecting defects or irregularities in glass sheet Expired GB1373241A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Cited By (4)

* Cited by examiner, † Cited by third party
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
FR2110158A5 (en) 1972-05-26
DE2154086C3 (en) 1975-01-23
JPS5036795B1 (en) 1975-11-27
DE2154086A1 (en) 1972-05-10
BE774740A (en) 1972-05-02
DE2154086B2 (en) 1974-05-16

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee