CA2002739A1 - Appareil et methode detection de defauts par reflexion de la lumiere au moyen de dispositifs a semiconducteur luminescents pulses a des longueur d'onde differentes - Google Patents

Appareil et methode detection de defauts par reflexion de la lumiere au moyen de dispositifs a semiconducteur luminescents pulses a des longueur d'onde differentes

Info

Publication number
CA2002739A1
CA2002739A1 CA2002739A CA2002739A CA2002739A1 CA 2002739 A1 CA2002739 A1 CA 2002739A1 CA 2002739 A CA2002739 A CA 2002739A CA 2002739 A CA2002739 A CA 2002739A CA 2002739 A1 CA2002739 A1 CA 2002739A1
Authority
CA
Canada
Prior art keywords
light
leds
semiconductor devices
different wavelengths
pulsed
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
CA2002739A
Other languages
English (en)
Other versions
CA2002739C (fr
Inventor
Steven L. Nylund
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.)
Conagra Foods Packaged Foods LLC
Original Assignee
Lamb Weston Inc
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 Lamb Weston Inc filed Critical Lamb Weston Inc
Publication of CA2002739A1 publication Critical patent/CA2002739A1/fr
Application granted granted Critical
Publication of CA2002739C publication Critical patent/CA2002739C/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G01N21/8806—Specially adapted optical and illumination features
    • A—HUMAN NECESSITIES
    • A21—BAKING; EDIBLE DOUGHS
    • A21C—MACHINES OR EQUIPMENT FOR MAKING OR PROCESSING DOUGHS; HANDLING BAKED ARTICLES MADE FROM DOUGH
    • A21C15/00—Apparatus for handling baked articles

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical 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)
  • Investigating Or Analysing Materials By Optical Means (AREA)
CA002002739A 1988-12-28 1989-11-10 Appareil et methode detection de defauts par reflexion de la lumiere au moyen de dispositifs a semiconducteur luminescents pulses a des longueur d'onde differentes Expired - Lifetime CA2002739C (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/291,237 1988-12-28
US07/291,237 US5000569A (en) 1988-12-28 1988-12-28 Light reflection defect detection apparatus and method using pulsed light-emitting semiconductor devices of different wavelengths

Publications (2)

Publication Number Publication Date
CA2002739A1 true CA2002739A1 (fr) 1990-06-28
CA2002739C CA2002739C (fr) 1999-09-28

Family

ID=23119484

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002002739A Expired - Lifetime CA2002739C (fr) 1988-12-28 1989-11-10 Appareil et methode detection de defauts par reflexion de la lumiere au moyen de dispositifs a semiconducteur luminescents pulses a des longueur d'onde differentes

Country Status (5)

Country Link
US (1) US5000569A (fr)
EP (1) EP0375881B1 (fr)
JP (1) JPH0830679B2 (fr)
CA (1) CA2002739C (fr)
DE (1) DE68906874T2 (fr)

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Also Published As

Publication number Publication date
JPH0830679B2 (ja) 1996-03-27
DE68906874D1 (de) 1993-07-08
EP0375881B1 (fr) 1993-06-02
DE68906874T2 (de) 1994-01-20
CA2002739C (fr) 1999-09-28
EP0375881A1 (fr) 1990-07-04
US5000569A (en) 1991-03-19
JPH02221844A (ja) 1990-09-04

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