FR2187118A5 - Testing glass sheet for defects - using a laser beam injected via the edge of the glass - Google Patents

Testing glass sheet for defects - using a laser beam injected via the edge of the glass

Info

Publication number
FR2187118A5
FR2187118A5 FR7219259A FR7219259A FR2187118A5 FR 2187118 A5 FR2187118 A5 FR 2187118A5 FR 7219259 A FR7219259 A FR 7219259A FR 7219259 A FR7219259 A FR 7219259A FR 2187118 A5 FR2187118 A5 FR 2187118A5
Authority
FR
France
Prior art keywords
glass
defects
edge
laser beam
light
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
FR7219259A
Other languages
French (fr)
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.)
Saint Gobain PAM SA
Original Assignee
Saint Gobain PAM SA
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 Saint Gobain PAM SA filed Critical Saint Gobain PAM SA
Priority to FR7219259A priority Critical patent/FR2187118A5/en
Priority to DE19732327381 priority patent/DE2327381A1/en
Application granted granted Critical
Publication of FR2187118A5 publication Critical patent/FR2187118A5/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

The glass sheet is illuminated by means of a beam of light, esp. laser light, injected into the glass through its edge, parallel to the glass surface. Defects in the glass reflect and refract the light, so that detectors spaced across the path of the glass sheet or ribbon and receiving light from the top surface thereof, locate any defects. The method avoids interference with light beam by dust attracted to the glass surface.
FR7219259A 1972-05-30 1972-05-30 Testing glass sheet for defects - using a laser beam injected via the edge of the glass Expired FR2187118A5 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR7219259A FR2187118A5 (en) 1972-05-30 1972-05-30 Testing glass sheet for defects - using a laser beam injected via the edge of the glass
DE19732327381 DE2327381A1 (en) 1972-05-30 1973-05-29 PROCEDURE FOR DETERMINING DEFECTS IN FLAT GLASS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7219259A FR2187118A5 (en) 1972-05-30 1972-05-30 Testing glass sheet for defects - using a laser beam injected via the edge of the glass

Publications (1)

Publication Number Publication Date
FR2187118A5 true FR2187118A5 (en) 1974-01-11

Family

ID=9099299

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7219259A Expired FR2187118A5 (en) 1972-05-30 1972-05-30 Testing glass sheet for defects - using a laser beam injected via the edge of the glass

Country Status (2)

Country Link
DE (1) DE2327381A1 (en)
FR (1) FR2187118A5 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0071257A1 (en) * 1981-07-29 1983-02-09 Feldmühle Aktiengesellschaft Method and device for the inspection of transparent material sheets
EP0838723A1 (en) * 1996-10-24 1998-04-29 Agfa-Gevaert N.V. A material comprising a layer on a glass support
CN107576670A (en) * 2017-09-29 2018-01-12 中航三鑫太阳能光电玻璃有限公司 The observation device of microbubble on a kind of glass

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4401893A (en) * 1981-07-29 1983-08-30 Intec Corporation Method and apparatus for optically inspecting a moving web of glass

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0071257A1 (en) * 1981-07-29 1983-02-09 Feldmühle Aktiengesellschaft Method and device for the inspection of transparent material sheets
EP0838723A1 (en) * 1996-10-24 1998-04-29 Agfa-Gevaert N.V. A material comprising a layer on a glass support
CN107576670A (en) * 2017-09-29 2018-01-12 中航三鑫太阳能光电玻璃有限公司 The observation device of microbubble on a kind of glass

Also Published As

Publication number Publication date
DE2327381A1 (en) 1973-12-13

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