FR2165004A5 - Detecting surface defects - in moving eg steel strip with disturbance signal discrimination - Google Patents

Detecting surface defects - in moving eg steel strip with disturbance signal discrimination

Info

Publication number
FR2165004A5
FR2165004A5 FR7144851A FR7144851A FR2165004A5 FR 2165004 A5 FR2165004 A5 FR 2165004A5 FR 7144851 A FR7144851 A FR 7144851A FR 7144851 A FR7144851 A FR 7144851A FR 2165004 A5 FR2165004 A5 FR 2165004A5
Authority
FR
France
Prior art keywords
signal
moving
steel strip
surface defects
detecting surface
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
FR7144851A
Other languages
French (fr)
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.)
JFE Engineering Corp
Original Assignee
Nippon Kokan 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 Nippon Kokan Ltd filed Critical Nippon Kokan Ltd
Priority to FR7144851A priority Critical patent/FR2165004A5/en
Application granted granted Critical
Publication of FR2165004A5 publication Critical patent/FR2165004A5/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

Process is where the surface is swept by luminous radiation. The light reflected by the surface is transformed into an electric signal, and the signal is used as a defect signal when its amplitude is > a preset amplitude. Each part of the surface is swept successively by >=1 luminous beam, the sweeps sepd. by a given period of time, and the signal from the first sweep retarded by the given period of time to put both signals into phase conformity, and a defect is not considered to be present unless both signal amplitudes are > the preset amplitude.
FR7144851A 1971-12-14 1971-12-14 Detecting surface defects - in moving eg steel strip with disturbance signal discrimination Expired FR2165004A5 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7144851A FR2165004A5 (en) 1971-12-14 1971-12-14 Detecting surface defects - in moving eg steel strip with disturbance signal discrimination

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7144851A FR2165004A5 (en) 1971-12-14 1971-12-14 Detecting surface defects - in moving eg steel strip with disturbance signal discrimination

Publications (1)

Publication Number Publication Date
FR2165004A5 true FR2165004A5 (en) 1973-08-03

Family

ID=9087438

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7144851A Expired FR2165004A5 (en) 1971-12-14 1971-12-14 Detecting surface defects - in moving eg steel strip with disturbance signal discrimination

Country Status (1)

Country Link
FR (1) FR2165004A5 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0006648A1 (en) * 1978-06-26 1980-01-09 Agfa-Gevaert N.V. Method and device for inspecting a moving sheet material for streaklike defects

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0006648A1 (en) * 1978-06-26 1980-01-09 Agfa-Gevaert N.V. Method and device for inspecting a moving sheet material for streaklike defects

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Legal Events

Date Code Title Description
ST Notification of lapse