JPS5614935A - Surface defect detecting method - Google Patents

Surface defect detecting method

Info

Publication number
JPS5614935A
JPS5614935A JP9176279A JP9176279A JPS5614935A JP S5614935 A JPS5614935 A JP S5614935A JP 9176279 A JP9176279 A JP 9176279A JP 9176279 A JP9176279 A JP 9176279A JP S5614935 A JPS5614935 A JP S5614935A
Authority
JP
Japan
Prior art keywords
light
rays
moving object
defect detecting
visual
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.)
Pending
Application number
JP9176279A
Other languages
Japanese (ja)
Inventor
Naotake Okubo
Mitsuhiro Ota
Hideyuki Okaya
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.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
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 Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP9176279A priority Critical patent/JPS5614935A/en
Publication of JPS5614935A publication Critical patent/JPS5614935A/en
Pending 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

PURPOSE:To improve a surface defect detecting accuracy by irradiating a plurality of rays of light at different angles onto a surface of a moving object. CONSTITUTION:A visual field of a television camera 2 on a surface of a moving object 1, such as a steel material is divided into a plurality of equal parts which are parallel to one another in the direction in which the object 1 is moved. The divisional regions A-D are illuminated with substantially parallel rays of light emitted in different directions from light sources 31-34, respectively. Accordingly, surface images of the regions A-D, which are illuminated in different directions and at different angles, are displayed side by side on a frame of a monitor television set 4. A specific portion of the surface of the moving object 1 is irradiated first with the rays of light from the light source 34, and the rays of light are reflected to the visual fied D. As a result, a defect of a special character appears on a zone D of the frame of the monitor television set 4. While a specific portion of the object 1 advances to the visual fields C, B, A in order, defects of special character corresponding to the rays of light from the light sources 33, 32, 31 are detected in the same manner as mentioned above. Therefore, the surface defect detecting accuracy can be improved without using an increased number of photographing units.
JP9176279A 1979-07-19 1979-07-19 Surface defect detecting method Pending JPS5614935A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9176279A JPS5614935A (en) 1979-07-19 1979-07-19 Surface defect detecting method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9176279A JPS5614935A (en) 1979-07-19 1979-07-19 Surface defect detecting method

Publications (1)

Publication Number Publication Date
JPS5614935A true JPS5614935A (en) 1981-02-13

Family

ID=14035556

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9176279A Pending JPS5614935A (en) 1979-07-19 1979-07-19 Surface defect detecting method

Country Status (1)

Country Link
JP (1) JPS5614935A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63218847A (en) * 1987-03-09 1988-09-12 Nok Corp Inspection of surface flaw
WO1992000517A1 (en) * 1990-06-22 1992-01-09 Alcan International Limited Illumination system for high speed surface inspection of rolled aluminum sheet
WO2017169242A1 (en) * 2016-03-28 2017-10-05 セーレン株式会社 Defect inspection device and defect inspection method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63218847A (en) * 1987-03-09 1988-09-12 Nok Corp Inspection of surface flaw
WO1992000517A1 (en) * 1990-06-22 1992-01-09 Alcan International Limited Illumination system for high speed surface inspection of rolled aluminum sheet
WO2017169242A1 (en) * 2016-03-28 2017-10-05 セーレン株式会社 Defect inspection device and defect inspection method
JPWO2017169242A1 (en) * 2016-03-28 2019-02-14 セーレン株式会社 Defect inspection apparatus and defect inspection method

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