GB1535726A - Detector circuits in a surface inspection system - Google Patents

Detector circuits in a surface inspection system

Info

Publication number
GB1535726A
GB1535726A GB816875A GB816875A GB1535726A GB 1535726 A GB1535726 A GB 1535726A GB 816875 A GB816875 A GB 816875A GB 816875 A GB816875 A GB 816875A GB 1535726 A GB1535726 A GB 1535726A
Authority
GB
United Kingdom
Prior art keywords
detector
photo
inspection system
amplifier
surface inspection
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
GB816875A
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.)
Ferranti International PLC
Original Assignee
Ferranti 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 Ferranti PLC filed Critical Ferranti PLC
Priority to GB816875A priority Critical patent/GB1535726A/en
Priority to CA246,352A priority patent/CA1068371A/en
Priority to US05/660,928 priority patent/US4048510A/en
Priority to DE19762607417 priority patent/DE2607417A1/en
Priority to NL7601997A priority patent/NL7601997A/en
Priority to JP51020219A priority patent/JPS51110390A/en
Publication of GB1535726A publication Critical patent/GB1535726A/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

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

1535726 Surface inspection system FERRANTI Ltd 23 Feb 1976 [27 Feb 1975 27 March 1975] 8168/75 and 13109/75 Heading G1A A surface inspection system includes a repetitive light beam scanner, photo-cell 16 producing signals dependent on the intensity of light received from the surface and an equalization circuit 19 comprising detector 23 detecting the peak magnitude of signals from amplifier 21' in each scan to control the mean level of the detector output signal in a subsequent scan, background signal level detector 24 to provide a threshold signal to the input of amplifier 21' so as to remove the background components, and a band-pass filter 25 which compensates for optical gain changes by controlling the signal level from further amplifier 21". The equalization circuit 19 renders the output signal constant except for the (negative) spikes due to surface faults. Detector 23 acts by controlling photo-multiplier power supply 20. To eliminate D.C. components a high pass filter 26 may be located in one or more of the places shown. There may be a plurality of photo-cells (15'), each viewing a different part of the surface as in the scanning station of Fig. 3 (not shown), with output summing means. A diffuser (17') may be anisotropic. Alternatively Fig. 4 (not shown) the detectors may have individual equalization circuits and one in common.
GB816875A 1975-02-27 1975-02-27 Detector circuits in a surface inspection system Expired GB1535726A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
GB816875A GB1535726A (en) 1975-02-27 1975-02-27 Detector circuits in a surface inspection system
CA246,352A CA1068371A (en) 1975-02-27 1976-02-23 Circuit arrangements for controlling detector signals in surface inspection systems
US05/660,928 US4048510A (en) 1975-02-27 1976-02-24 Circuit arrangements for controlling detector signals in surface inspection systems
DE19762607417 DE2607417A1 (en) 1975-02-27 1976-02-24 CIRCUIT ARRANGEMENT FOR SCANING A SURFACE
NL7601997A NL7601997A (en) 1975-02-27 1976-02-26 SURFACE INSPECTION DEVICE.
JP51020219A JPS51110390A (en) 1975-02-27 1976-02-27 Kairosochi

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB816875A GB1535726A (en) 1975-02-27 1975-02-27 Detector circuits in a surface inspection system

Publications (1)

Publication Number Publication Date
GB1535726A true GB1535726A (en) 1978-12-13

Family

ID=9847104

Family Applications (1)

Application Number Title Priority Date Filing Date
GB816875A Expired GB1535726A (en) 1975-02-27 1975-02-27 Detector circuits in a surface inspection system

Country Status (1)

Country Link
GB (1) GB1535726A (en)

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Legal Events

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