FR2300341A1 - Material testing method using eddy currents - which are generated by AC magnetic field of a fault testing coil - Google Patents

Material testing method using eddy currents - which are generated by AC magnetic field of a fault testing coil

Info

Publication number
FR2300341A1
FR2300341A1 FR7603347A FR7603347A FR2300341A1 FR 2300341 A1 FR2300341 A1 FR 2300341A1 FR 7603347 A FR7603347 A FR 7603347A FR 7603347 A FR7603347 A FR 7603347A FR 2300341 A1 FR2300341 A1 FR 2300341A1
Authority
FR
France
Prior art keywords
fault
eddy currents
generated
magnetic field
coil
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
FR7603347A
Other languages
French (fr)
Other versions
FR2300341B1 (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.)
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
Publication of FR2300341A1 publication Critical patent/FR2300341A1/en
Application granted granted Critical
Publication of FR2300341B1 publication Critical patent/FR2300341B1/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
    • G01N27/9046—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
    • 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

Abstract

A fault signal corresponding to a fault in the material is amplified and detected, or impedance change of the test coils is measured, caused by changes in eddy currents induced in the test piece. A feed-back circuit consists of a feed-back amplifier and test coils. Impedance change of test coils due to material fault in the test piece is converted into the feed-back amplifier gain, and the amplifier output voltage is measured or detected, so that a signal proportional to the fault can be collected.
FR7603347A 1975-02-07 1976-02-06 Material testing method using eddy currents - which are generated by AC magnetic field of a fault testing coil Granted FR2300341A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP50015369A JPS5190875A (en) 1975-02-07 1975-02-07 Karyutanshoho oyobi sonosochi

Publications (2)

Publication Number Publication Date
FR2300341A1 true FR2300341A1 (en) 1976-09-03
FR2300341B1 FR2300341B1 (en) 1979-08-24

Family

ID=11886863

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7603347A Granted FR2300341A1 (en) 1975-02-07 1976-02-06 Material testing method using eddy currents - which are generated by AC magnetic field of a fault testing coil

Country Status (3)

Country Link
JP (1) JPS5190875A (en)
DE (1) DE2604498A1 (en)
FR (1) FR2300341A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5940265B2 (en) * 1978-02-13 1984-09-28 日本鋼管株式会社 Thermal billet eddy current flaw detection equipment

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NEANT *

Also Published As

Publication number Publication date
FR2300341B1 (en) 1979-08-24
DE2604498A1 (en) 1976-08-19
JPS5190875A (en) 1976-08-09

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Legal Events

Date Code Title Description
ST Notification of lapse