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GB880135A - Improvements in or relating to the examination of sheet material - Google Patents

Improvements in or relating to the examination of sheet material

Info

Publication number
GB880135A
GB880135A GB633959A GB633959A GB880135A GB 880135 A GB880135 A GB 880135A GB 633959 A GB633959 A GB 633959A GB 633959 A GB633959 A GB 633959A GB 880135 A GB880135 A GB 880135A
Authority
GB
United Kingdom
Prior art keywords
sheet
detector
output
flaw
slit
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
GB633959A
Inventor
Gordon Thomas Winch
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.)
General Electric Company PLC
Original Assignee
General Electric Company PLC
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 General Electric Company PLC filed Critical General Electric Company PLC
Priority to GB633959A priority Critical patent/GB880135A/en
Publication of GB880135A publication Critical patent/GB880135A/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
    • 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
    • G01N21/55—Specular reflectivity

Landscapes

  • 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)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

880,135. Photo-electric inspection apparatus. GENERAL ELECTRIC CO. Ltd. May 16, 1960 [Feb. 24, 1959], No. 6339/59. Drawings to Specification. Class 40(3). An apparatus for the inspection of sheet material which has a smooth and highly reflecting surface includes a light source, a photosensitive detector to receive light from the source which has been reflected from said surface, and means responsive to the output of the detector to mark the material if a flaw is detected. The sheet material and the detector are moved relative to each other, and in the embodiment described with reference to the Figures the light source comprises a lamp which extends across the sheet and is enclosed in an enclosure having a slit in it. The image of this slit is focused towards a further slit in front of an elongated photosensitive unit which also extends across the sheet. It is arranged that the image does not fall on the second slit, and hence actuate the photosensitive unit, unless there is a flaw in the sheet material. The output of the photosensitive unit controls, via a delay if necessary, a device for marking the material, e.g. with paint, near the edge of the sheet and in line with the flaw. The output may also control a means for sorting faulty pieces of sheet from flawless ones when the material is in plate form. In further embodiments the detector comprises a number of photosensitive units, each associated with a separate marking means so that the sheet is marked near to any detected flaw. Alternatively the detector may scan the illuminated strip of the sheet, the marking means being moved in synchronism with it, or there being a number of marking means which are switched synchronously to the detector output. A cutting device may be included which, in response to the detector output, cuts out any flaw-containing portion of the sheet. To overcome the effect of stray light the light source output is preferably chopped and the detector output passed to an A.C. amplifier. A number of pairs of light sources and detectors may be used, e.g. in echelon formation, to cover the width of the sheet, In yet further embodiments the light source comprises one or more cathode ray tubes, scanned repeatedly to illuminate the surface of the sheet.
GB633959A 1959-02-24 1959-02-24 Improvements in or relating to the examination of sheet material Expired GB880135A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB633959A GB880135A (en) 1959-02-24 1959-02-24 Improvements in or relating to the examination of sheet material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB633959A GB880135A (en) 1959-02-24 1959-02-24 Improvements in or relating to the examination of sheet material

Publications (1)

Publication Number Publication Date
GB880135A true GB880135A (en) 1961-10-18

Family

ID=9812691

Family Applications (1)

Application Number Title Priority Date Filing Date
GB633959A Expired GB880135A (en) 1959-02-24 1959-02-24 Improvements in or relating to the examination of sheet material

Country Status (1)

Country Link
GB (1) GB880135A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3992111A (en) * 1974-02-01 1976-11-16 Ciba-Geigy Ag Apparatus for detecting defect locations at the surface of a moving reflecting material
US4302108A (en) * 1979-01-29 1981-11-24 Polaroid Corporation Detection of subsurface defects by reflection interference
EP0051899A1 (en) * 1980-11-07 1982-05-19 De Nederlandsche Bank N.V. Apparatus for automatically detecting and evaluating the characteristics of prints
US4563095A (en) * 1982-12-20 1986-01-07 Essex Group, Inc. Method and apparatus for monitoring the surface of elongated objects
EP0642013A1 (en) * 1993-09-03 1995-03-08 Minnesota Mining And Manufacturing Company System for detecting defects in articles
WO1999064845A1 (en) * 1998-06-05 1999-12-16 Glaverbel Defect detecting unit

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3992111A (en) * 1974-02-01 1976-11-16 Ciba-Geigy Ag Apparatus for detecting defect locations at the surface of a moving reflecting material
US4302108A (en) * 1979-01-29 1981-11-24 Polaroid Corporation Detection of subsurface defects by reflection interference
EP0051899A1 (en) * 1980-11-07 1982-05-19 De Nederlandsche Bank N.V. Apparatus for automatically detecting and evaluating the characteristics of prints
US4555181A (en) * 1980-11-07 1985-11-26 De Nederlandsche Bank N.V. Apparatus for automatically detecting and evaluating the characteristics of prints
US4563095A (en) * 1982-12-20 1986-01-07 Essex Group, Inc. Method and apparatus for monitoring the surface of elongated objects
EP0642013A1 (en) * 1993-09-03 1995-03-08 Minnesota Mining And Manufacturing Company System for detecting defects in articles
US5559341A (en) * 1993-09-03 1996-09-24 Minnesota Mining And Manufacturing Company System for detecting defects in articles using a scanning width which is less than width of portion of the article scanned
WO1999064845A1 (en) * 1998-06-05 1999-12-16 Glaverbel Defect detecting unit

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