FR2425070A1 - Detection and analysis of surface faults on product - is determined from servo controlled detector suspended above surface - Google Patents

Detection and analysis of surface faults on product - is determined from servo controlled detector suspended above surface

Info

Publication number
FR2425070A1
FR2425070A1 FR7814101A FR7814101A FR2425070A1 FR 2425070 A1 FR2425070 A1 FR 2425070A1 FR 7814101 A FR7814101 A FR 7814101A FR 7814101 A FR7814101 A FR 7814101A FR 2425070 A1 FR2425070 A1 FR 2425070A1
Authority
FR
France
Prior art keywords
product
detector
analysis
detection
determined
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
FR7814101A
Other languages
French (fr)
Other versions
FR2425070B2 (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.)
SETIM
Original Assignee
SETIM
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
Priority claimed from FR7715002A external-priority patent/FR2390729A1/en
Application filed by SETIM filed Critical SETIM
Priority to FR7814101A priority Critical patent/FR2425070A1/en
Publication of FR2425070A1 publication Critical patent/FR2425070A1/en
Application granted granted Critical
Publication of FR2425070B2 publication Critical patent/FR2425070B2/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
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
    • G01N27/9093—Arrangements for supporting the sensor; Combinations of eddy-current sensors and auxiliary arrangements for marking or for rejecting
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
    • G01N27/904—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents with two or more sensors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
    • G01N27/9046—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents by analysing electrical signals

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Control And Safety Of Cranes (AREA)

Abstract

Surface faults in a product are sensed by a detector which is servo controlled to be suspended at a particular distance above the surface. Correction of detector position is rapid and precise. A jib (1) is mounted on the housing (2) and supports a detector block (18) above the product (4) which is supported on rollers (3). The detector comprises upstream (19) and downstream (20) sensor cells which are connected to a servo control circuit assembly (21) which maintains detector at given distance from the product surface. These circuits drive a hydraulic jack (10) which moves the detector assembly vertically on a guide shaft (8).
FR7814101A 1977-05-10 1978-05-05 Detection and analysis of surface faults on product - is determined from servo controlled detector suspended above surface Granted FR2425070A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7814101A FR2425070A1 (en) 1977-05-10 1978-05-05 Detection and analysis of surface faults on product - is determined from servo controlled detector suspended above surface

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7715002A FR2390729A1 (en) 1977-05-10 1977-05-10 Bimetallic strip fault detector - has precision roller bed and motor and uses oscillating magnetic fields to probe strip
FR7814101A FR2425070A1 (en) 1977-05-10 1978-05-05 Detection and analysis of surface faults on product - is determined from servo controlled detector suspended above surface

Publications (2)

Publication Number Publication Date
FR2425070A1 true FR2425070A1 (en) 1979-11-30
FR2425070B2 FR2425070B2 (en) 1982-11-26

Family

ID=26220021

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7814101A Granted FR2425070A1 (en) 1977-05-10 1978-05-05 Detection and analysis of surface faults on product - is determined from servo controlled detector suspended above surface

Country Status (1)

Country Link
FR (1) FR2425070A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2504704A1 (en) * 1981-04-24 1982-10-29 Mannesmann Ag METHOD AND DEVICE FOR NON-CONTACT GUIDING OF NON-DESTRUCTIVE TUBE CONTROL APPARATUS
US4607525A (en) * 1984-10-09 1986-08-26 General Signal Corporation Height measuring system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB839996A (en) * 1957-04-13 1960-06-29 Ti Group Services Ltd Pneumatic servo system
FR2061449A5 (en) * 1969-09-29 1971-06-18 Nippon Kokan Kk
FR2282640A1 (en) * 1974-08-19 1976-03-19 Graenges Oxeloesunds Jaernverk DEVICE FOR THE NON-DESTRUCTIVE DETECTION OF SURFACE FAULTS ON RAW METAL PARTS

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB839996A (en) * 1957-04-13 1960-06-29 Ti Group Services Ltd Pneumatic servo system
FR2061449A5 (en) * 1969-09-29 1971-06-18 Nippon Kokan Kk
FR2282640A1 (en) * 1974-08-19 1976-03-19 Graenges Oxeloesunds Jaernverk DEVICE FOR THE NON-DESTRUCTIVE DETECTION OF SURFACE FAULTS ON RAW METAL PARTS

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2504704A1 (en) * 1981-04-24 1982-10-29 Mannesmann Ag METHOD AND DEVICE FOR NON-CONTACT GUIDING OF NON-DESTRUCTIVE TUBE CONTROL APPARATUS
US4607525A (en) * 1984-10-09 1986-08-26 General Signal Corporation Height measuring system

Also Published As

Publication number Publication date
FR2425070B2 (en) 1982-11-26

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Legal Events

Date Code Title Description
TP Transmission of property