JPS56145337A - Detecting method for surface flaw of long body - Google Patents

Detecting method for surface flaw of long body

Info

Publication number
JPS56145337A
JPS56145337A JP4948780A JP4948780A JPS56145337A JP S56145337 A JPS56145337 A JP S56145337A JP 4948780 A JP4948780 A JP 4948780A JP 4948780 A JP4948780 A JP 4948780A JP S56145337 A JPS56145337 A JP S56145337A
Authority
JP
Japan
Prior art keywords
light
flaw
inspected
substance
numerals
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
JP4948780A
Other languages
Japanese (ja)
Inventor
Fumihiko Abe
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.)
Furukawa Electric Co Ltd
Original Assignee
Furukawa Electric Co Ltd
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 Furukawa Electric Co Ltd filed Critical Furukawa Electric Co Ltd
Priority to JP4948780A priority Critical patent/JPS56145337A/en
Publication of JPS56145337A publication Critical patent/JPS56145337A/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
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/952—Inspecting the exterior surface of cylindrical bodies or wires

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)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)

Abstract

PURPOSE:To catch the part of the shadow of the flaw in a convex part, etc. by comparing the level of luminous energy of a reflected light at two points positioned in the direction of the path of the light and separated at a desired interval. CONSTITUTION:A light from a light source 1 is applied to a substance 3 to be inspected in the longitudinal direction thereof by an optical fiber 8 through the intermediary of a lens 2. Numerals 9a and 9b indicate optical fibers for receiving light which detect the reflected light of the light applied to the substance 3 to be inspected, and the light-receiving ends 9a' and 9b' thereof are arranged in parallel and at a prescribed interval in the direction of the path of the light irradiated from the optical fiber 8 for projection. Light-receiving elements, amplifiers and a division circuit are shown by numerals 5, 6 and 7 respectively. When the received- light photoelectric level ratio between the optical fibers 9a and 9b exceeds a reference level set before-hand, the determination that there is a flaw is given.
JP4948780A 1980-04-15 1980-04-15 Detecting method for surface flaw of long body Pending JPS56145337A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4948780A JPS56145337A (en) 1980-04-15 1980-04-15 Detecting method for surface flaw of long body

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4948780A JPS56145337A (en) 1980-04-15 1980-04-15 Detecting method for surface flaw of long body

Publications (1)

Publication Number Publication Date
JPS56145337A true JPS56145337A (en) 1981-11-12

Family

ID=12832506

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4948780A Pending JPS56145337A (en) 1980-04-15 1980-04-15 Detecting method for surface flaw of long body

Country Status (1)

Country Link
JP (1) JPS56145337A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0224538A (en) * 1988-07-13 1990-01-26 Anzai Sogo Kenkyusho:Kk Apparatus for detecting fissure and crack
JP2005301065A (en) * 2004-04-14 2005-10-27 Olympus Corp Observation device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0224538A (en) * 1988-07-13 1990-01-26 Anzai Sogo Kenkyusho:Kk Apparatus for detecting fissure and crack
JP2005301065A (en) * 2004-04-14 2005-10-27 Olympus Corp Observation device

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