GB1338611A - Method and apparatus for detecting faults in sheet glass - Google Patents

Method and apparatus for detecting faults in sheet glass

Info

Publication number
GB1338611A
GB1338611A GB1338611DA GB1338611A GB 1338611 A GB1338611 A GB 1338611A GB 1338611D A GB1338611D A GB 1338611DA GB 1338611 A GB1338611 A GB 1338611A
Authority
GB
United Kingdom
Prior art keywords
photo
light
scattered
sheet
defects
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
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.)
British Aircraft Corp Ltd
Original Assignee
British Aircraft Corp 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 British Aircraft Corp Ltd filed Critical British Aircraft Corp Ltd
Publication of GB1338611A publication Critical patent/GB1338611A/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

Abstract

1338611 Photo-electric fault detection BRITISH AIRCRAFT CORP Ltd 19 April 1971 [16 Feb 19701 7315/70 Heading G1A. [Also in Division G2] Faults in a moving sheet of glass 11 are detected by scanning a focused laser beam 14 back and forth across the sheet and detecting light scattered from the faults either visually or photoelectrically. In the photo-electric embodiment, the laser 13, focusing lens 15 and two photo-cell pairs 21/22 and 23/24 are scanned together. Detectors 22 and 24 are provided with lenses and hence pick up light scattered from smaller defects, whereas detectors 21 and 23, which may be photomultipliers, respond to scattered light and interference fringes resulting from larger defects. Two arrays 19, 20 of stationary photo-cells define between them a passage for unscattered light, and hence also respond to any scattered light. For visual observation, Fig. 1, (not shown), the sheet of glass is passed between a pair of screens (2, 3) each having a slit (4, 5) through which the scanning beam passes. Light scattered from defects produces patterns on these screens, different types of defect producing different types of pattern.
GB1338611D 1970-02-16 1971-04-19 Method and apparatus for detecting faults in sheet glass Expired GB1338611A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB731570 1970-02-16

Publications (1)

Publication Number Publication Date
GB1338611A true GB1338611A (en) 1973-11-28

Family

ID=9830790

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1338611D Expired GB1338611A (en) 1970-02-16 1971-04-19 Method and apparatus for detecting faults in sheet glass

Country Status (2)

Country Link
FR (1) FR2078535A5 (en)
GB (1) GB1338611A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3310341A1 (en) * 1982-03-23 1983-09-29 Canon K.K., Tokyo DEVICE FOR TESTING NEGATIVES
US4697082A (en) * 1984-12-14 1987-09-29 Flachglas Aktiengesellschaft Process and apparatus for testing transparent material webs, particularly plate glass ribbons
WO2006087213A2 (en) * 2005-02-18 2006-08-24 Schott Ag Method and device for detecting and/or classifying defects
CN112051265A (en) * 2019-06-06 2020-12-08 华为技术有限公司 Defect detection method and defect detection equipment

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2173294B (en) * 1985-04-02 1988-10-12 Glaverbel Method of and apparatus for determining the location of defects present in flat glass

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3310341A1 (en) * 1982-03-23 1983-09-29 Canon K.K., Tokyo DEVICE FOR TESTING NEGATIVES
US4697082A (en) * 1984-12-14 1987-09-29 Flachglas Aktiengesellschaft Process and apparatus for testing transparent material webs, particularly plate glass ribbons
WO2006087213A2 (en) * 2005-02-18 2006-08-24 Schott Ag Method and device for detecting and/or classifying defects
WO2006087213A3 (en) * 2005-02-18 2007-03-29 Schott Ag Method and device for detecting and/or classifying defects
CN112051265A (en) * 2019-06-06 2020-12-08 华为技术有限公司 Defect detection method and defect detection equipment

Also Published As

Publication number Publication date
FR2078535A5 (en) 1971-11-05

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Legal Events

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