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GB2018985A - Detecting Flaws in Sheets - Google Patents

Detecting Flaws in Sheets

Info

Publication number
GB2018985A
GB2018985A GB7916525A GB7916525A GB2018985A GB 2018985 A GB2018985 A GB 2018985A GB 7916525 A GB7916525 A GB 7916525A GB 7916525 A GB7916525 A GB 7916525A GB 2018985 A GB2018985 A GB 2018985A
Authority
GB
United Kingdom
Prior art keywords
sheet
photomultiplier
scan
mirror
modulator
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.)
Granted
Application number
GB7916525A
Other versions
GB2018985B (en
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.)
SIRA INSTITUTE
Original Assignee
SIRA INSTITUTE
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 SIRA INSTITUTE filed Critical SIRA INSTITUTE
Priority to GB7916525A priority Critical patent/GB2018985B/en
Publication of GB2018985A publication Critical patent/GB2018985A/en
Priority to US06/144,938 priority patent/US4323311A/en
Priority to DE3017672A priority patent/DE3017672A1/en
Priority to FR8010418A priority patent/FR2456306A1/en
Application granted granted Critical
Publication of GB2018985B publication Critical patent/GB2018985B/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
    • G01N21/8901—Optical details; Scanning details

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

Method and apparatus for detecting holes or surface flaws in sheet material such as tinplate 10 moving in the direction of the arrow where a beam from a laser passing through a modulator (not shown) is scanned by a mirror drum 14 across cylindrical mirror 16 and plane mirror 17 to produce a slit shaped beam and the light passing through a hole is received by a bunch of light guides 22 and passed to a photomultiplier 36. Light reflected from the sheet surface strikes semi-diffusing retro-reflector 61 and travels back along a path similar to that of the original beam to second photomultiplier 63 which registers faults on the sheet surface which are characterised by changes in reflectivity. The output of photomultiplier 36 is also used to control the modulator hence the scan. Potential scan errors at the sheet edge are corrected by a half-wave plate (Figures 10, 11). Holes not substantially normal to the plane of the sheet may be detected by a dual- beam scanning arrangement (Figure 6). The position of a flaw can be detected by correlation of its resultant signal with a signal related to the scan. <IMAGE>
GB7916525A 1978-02-13 1979-05-11 Detecting flaws in sheets Expired GB2018985B (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB7916525A GB2018985B (en) 1978-02-13 1979-05-11 Detecting flaws in sheets
US06/144,938 US4323311A (en) 1979-05-11 1980-04-29 Apparatus and method for detecting holes in sheet material
DE3017672A DE3017672A1 (en) 1979-05-11 1980-05-08 DEVICE AND METHOD FOR DETECTING HOLES IN PLATE, SHEET OR FILM MATERIAL
FR8010418A FR2456306A1 (en) 1979-05-11 1980-05-09 METHOD AND APPARATUS FOR DETECTING HOLES IN SHEET MATERIAL

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB562678 1978-02-13
GB7916525A GB2018985B (en) 1978-02-13 1979-05-11 Detecting flaws in sheets

Publications (2)

Publication Number Publication Date
GB2018985A true GB2018985A (en) 1979-10-24
GB2018985B GB2018985B (en) 1983-01-06

Family

ID=26240031

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7916525A Expired GB2018985B (en) 1978-02-13 1979-05-11 Detecting flaws in sheets

Country Status (1)

Country Link
GB (1) GB2018985B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0069061A1 (en) * 1981-06-17 1983-01-05 Ciba-Geigy Ag Method and device for inspecting web material
GB2117897A (en) * 1982-03-03 1983-10-19 Sira Ltd Detecting surface defects
GB2159271A (en) * 1984-04-27 1985-11-27 Nissan Motor Surface flaw detecting method and apparatus
CN107345918A (en) * 2017-08-16 2017-11-14 广西大学 A kind of board quality testing apparatus and method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0069061A1 (en) * 1981-06-17 1983-01-05 Ciba-Geigy Ag Method and device for inspecting web material
US4522497A (en) * 1981-06-17 1985-06-11 Ciba Geigy Ag Web scanning apparatus
GB2117897A (en) * 1982-03-03 1983-10-19 Sira Ltd Detecting surface defects
GB2159271A (en) * 1984-04-27 1985-11-27 Nissan Motor Surface flaw detecting method and apparatus
CN107345918A (en) * 2017-08-16 2017-11-14 广西大学 A kind of board quality testing apparatus and method

Also Published As

Publication number Publication date
GB2018985B (en) 1983-01-06

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Legal Events

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