FR2381304A1 - Material surface faults detector - has camera tubes with shutters for taking stationary pictures, and has noise correction circuit - Google Patents

Material surface faults detector - has camera tubes with shutters for taking stationary pictures, and has noise correction circuit

Info

Publication number
FR2381304A1
FR2381304A1 FR7704807A FR7704807A FR2381304A1 FR 2381304 A1 FR2381304 A1 FR 2381304A1 FR 7704807 A FR7704807 A FR 7704807A FR 7704807 A FR7704807 A FR 7704807A FR 2381304 A1 FR2381304 A1 FR 2381304A1
Authority
FR
France
Prior art keywords
material surface
camera
shutters
correction circuit
reflected
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
FR7704807A
Other languages
French (fr)
Other versions
FR2381304B1 (en
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 FR7704807A priority Critical patent/FR2381304A1/en
Publication of FR2381304A1 publication Critical patent/FR2381304A1/en
Application granted granted Critical
Publication of FR2381304B1 publication Critical patent/FR2381304B1/fr
Granted 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/72—Investigating presence of flaws

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)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

Radiation emitted by and/or reflected from the material surface at high temp. esp. reflected radiation of illuminating flashes from esp. a stroboscope, is detected and photoelectrically converted. The device comprises a t.v. camera (45, 45') for detection of the radiated energy or radiation intensity, and/or the reflected energy or intensity of reflected radiation from the material surface (43). A shutter ir diaphragm is before the camera tube, so that a stationary image of moving material (43) can be obtained. A noise level control circuit is between the camera output and the input of a recognition circuit for recognition of faults, so that output signal fluctuations in the camera tube image plane are corrected.
FR7704807A 1977-02-18 1977-02-18 Material surface faults detector - has camera tubes with shutters for taking stationary pictures, and has noise correction circuit Granted FR2381304A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7704807A FR2381304A1 (en) 1977-02-18 1977-02-18 Material surface faults detector - has camera tubes with shutters for taking stationary pictures, and has noise correction circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7704807A FR2381304A1 (en) 1977-02-18 1977-02-18 Material surface faults detector - has camera tubes with shutters for taking stationary pictures, and has noise correction circuit

Publications (2)

Publication Number Publication Date
FR2381304A1 true FR2381304A1 (en) 1978-09-15
FR2381304B1 FR2381304B1 (en) 1981-07-31

Family

ID=9186965

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7704807A Granted FR2381304A1 (en) 1977-02-18 1977-02-18 Material surface faults detector - has camera tubes with shutters for taking stationary pictures, and has noise correction circuit

Country Status (1)

Country Link
FR (1) FR2381304A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0089760A2 (en) * 1982-03-18 1983-09-28 United Kingdom Atomic Energy Authority Transient thermography
EP0153565A2 (en) * 1984-02-28 1985-09-04 Kawasaki Steel Corporation Method and apparatus for detection of surface defects of hot metal body
FR2563342A1 (en) * 1984-04-24 1985-10-25 Somafer Sa METHOD FOR DETECTING AND RECORDING DEFECTS ON HOT STEEL SEMI-PRODUCTS
US6859285B1 (en) 1999-08-31 2005-02-22 Og Technologies, Inc. Optical observation device and method for observing articles at elevated temperatures

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0089760A2 (en) * 1982-03-18 1983-09-28 United Kingdom Atomic Energy Authority Transient thermography
EP0089760A3 (en) * 1982-03-18 1985-02-06 United Kingdom Atomic Energy Authority Transient thermography
EP0153565A2 (en) * 1984-02-28 1985-09-04 Kawasaki Steel Corporation Method and apparatus for detection of surface defects of hot metal body
EP0153565A3 (en) * 1984-02-28 1986-06-04 Kawasaki Steel Corporation Method and apparatus for detection of surface defects of hot metal body
US4759072A (en) * 1984-02-28 1988-07-19 Kawasaki Steel Corp. Method and apparatus for detection of surface defects of hot metal body
FR2563342A1 (en) * 1984-04-24 1985-10-25 Somafer Sa METHOD FOR DETECTING AND RECORDING DEFECTS ON HOT STEEL SEMI-PRODUCTS
WO1985004956A1 (en) * 1984-04-24 1985-11-07 Somafer Method for detecting and recording defects on hot metallurgical semi-products
US4671674A (en) * 1984-04-24 1987-06-09 Somafer Process for the detection and recording of weak points or defects on hot iron and steel industry semifinished products
US6859285B1 (en) 1999-08-31 2005-02-22 Og Technologies, Inc. Optical observation device and method for observing articles at elevated temperatures

Also Published As

Publication number Publication date
FR2381304B1 (en) 1981-07-31

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Legal Events

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