FR2312777A1 - Ferromagnetic materials inspection system - has reference component and test component, both subjected to inductive magnetic field - Google Patents

Ferromagnetic materials inspection system - has reference component and test component, both subjected to inductive magnetic field

Info

Publication number
FR2312777A1
FR2312777A1 FR7517661A FR7517661A FR2312777A1 FR 2312777 A1 FR2312777 A1 FR 2312777A1 FR 7517661 A FR7517661 A FR 7517661A FR 7517661 A FR7517661 A FR 7517661A FR 2312777 A1 FR2312777 A1 FR 2312777A1
Authority
FR
France
Prior art keywords
component
subjected
magnetic field
inspection system
ferromagnetic materials
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
FR7517661A
Other languages
French (fr)
Other versions
FR2312777B1 (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.)
Automobiles Citroen SA
Original Assignee
Automobiles Citroen SA
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 Automobiles Citroen SA filed Critical Automobiles Citroen SA
Priority to FR7517661A priority Critical patent/FR2312777A1/en
Publication of FR2312777A1 publication Critical patent/FR2312777A1/en
Application granted granted Critical
Publication of FR2312777B1 publication Critical patent/FR2312777B1/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
    • 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)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

The component (7) under test and a reference component are subjected to the same alternating field which produces a variable flux in each component depending on its magnetic permeability. The variation of the flux produces an induced electromagnetic voltage. The two voltages produced are compared and the third harmonic of the difference voltage (19) is examined. The inductive alternating magnetic field is chosen for operation within the linear region of the magnetisation curve of the reference component (2). The associated equipment includes a conveyor belt and two relays (24) one of which actuates a system which separates the component inspected if it fails to produce a threshold signal level.
FR7517661A 1975-05-30 1975-05-30 Ferromagnetic materials inspection system - has reference component and test component, both subjected to inductive magnetic field Granted FR2312777A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7517661A FR2312777A1 (en) 1975-05-30 1975-05-30 Ferromagnetic materials inspection system - has reference component and test component, both subjected to inductive magnetic field

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7517661A FR2312777A1 (en) 1975-05-30 1975-05-30 Ferromagnetic materials inspection system - has reference component and test component, both subjected to inductive magnetic field

Publications (2)

Publication Number Publication Date
FR2312777A1 true FR2312777A1 (en) 1976-12-24
FR2312777B1 FR2312777B1 (en) 1981-02-13

Family

ID=9156117

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7517661A Granted FR2312777A1 (en) 1975-05-30 1975-05-30 Ferromagnetic materials inspection system - has reference component and test component, both subjected to inductive magnetic field

Country Status (1)

Country Link
FR (1) FR2312777A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0017682A2 (en) * 1979-04-17 1980-10-29 Geoprobe Limited Method and system for geophysical induction surveying
EP0066320A2 (en) * 1981-05-26 1982-12-08 Flather Bright Steels Limited Non-destructive testing
WO1989010557A1 (en) * 1988-04-23 1989-11-02 Fraunhofer-Gesellschaft Zur Förderung Der Angewand Process and apparatus for disturbance-free measurement of the magnetic properties a test object
US5280240A (en) * 1989-10-02 1994-01-18 North American Philips Corporation Methodology using odd harmonic components of an induced magnetic field for analyzing superconducting magnetic materials and their properties
US5283524A (en) * 1989-10-02 1994-02-01 U.S. Philips Corporation AC magnetic susceptometer with odd harmonic measurement for analyzing superconductive magnetic materials

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0017682A2 (en) * 1979-04-17 1980-10-29 Geoprobe Limited Method and system for geophysical induction surveying
EP0017682A3 (en) * 1979-04-17 1981-04-22 Geoprobe Limited Method and system for geophysical induction surveying
EP0066320A2 (en) * 1981-05-26 1982-12-08 Flather Bright Steels Limited Non-destructive testing
EP0066320A3 (en) * 1981-05-26 1984-04-25 Flather Bright Steels Limited Non-destructive testing
WO1989010557A1 (en) * 1988-04-23 1989-11-02 Fraunhofer-Gesellschaft Zur Förderung Der Angewand Process and apparatus for disturbance-free measurement of the magnetic properties a test object
US5028869A (en) * 1988-04-23 1991-07-02 Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forshung E.V. Process and apparatus for the nondestructive measuring of magnetic properties of a test body, by detecting a tangential magnetic field and deriving harmonic components thereof
US5280240A (en) * 1989-10-02 1994-01-18 North American Philips Corporation Methodology using odd harmonic components of an induced magnetic field for analyzing superconducting magnetic materials and their properties
US5283524A (en) * 1989-10-02 1994-02-01 U.S. Philips Corporation AC magnetic susceptometer with odd harmonic measurement for analyzing superconductive magnetic materials

Also Published As

Publication number Publication date
FR2312777B1 (en) 1981-02-13

Similar Documents

Publication Publication Date Title
KR840002524A (en) Device for detecting metal body
ATE9739T1 (en) METHOD AND DEVICE FOR TESTING PIPES.
GB1005816A (en) Improvements relating to methods of and apparatus for the detection of flaws
GB1458794A (en) Eddy current test coil assembly
FR2312777A1 (en) Ferromagnetic materials inspection system - has reference component and test component, both subjected to inductive magnetic field
US3742357A (en) Noncontact electric apparatus for magnetically measuring strains
US2788486A (en) Electrical testing apparatus
US2207392A (en) Demagnetization
US2415808A (en) Detection of large magentic bodies
US2162710A (en) Apparatus and method for detecting defects in metallic objects
US3444458A (en) Device for detecting variations in magnetic properties of ferromagnetic material
GB573182A (en) Improvements in or relating to the detection of faults in articles of non-magnetic material
DK149439B (en) METHOD OF MEASURING A CORRESPONDENT OR A LOW FREQUENCY AC
US2098064A (en) Magnetic testing device
US2245568A (en) Method of and apparatus for examining ferromagnetic articles
JPS57148201A (en) Detecting device for contact
GB1468852A (en) Method and device for eddy-current detection of a change in magnetic behaviour of a material
SU1188630A1 (en) Method of non-contact multiparameter inspection of articles from electro-conducting materials
JPS56154687A (en) Minute-metal detector
SU151091A1 (en) Method for detecting defects in articles made of ferromagnetic materials
GB1403734A (en) Testing of materials
JPS52119285A (en) Method of and apparatus for inspecting flaws in lengthened metallic material by magnetism or magnetic induction
JPS5739344A (en) Eddy current flaw detector
SU947738A1 (en) Method of non-destructive checking of ferromagnetic material articles
GB766353A (en) Improvements in and relating to non-destructive testing of ferromagnetic workpieces

Legal Events

Date Code Title Description
ST Notification of lapse