GB1275104A - Eddy current test apparatus - Google Patents

Eddy current test apparatus

Info

Publication number
GB1275104A
GB1275104A GB2552869A GB2552869A GB1275104A GB 1275104 A GB1275104 A GB 1275104A GB 2552869 A GB2552869 A GB 2552869A GB 2552869 A GB2552869 A GB 2552869A GB 1275104 A GB1275104 A GB 1275104A
Authority
GB
United Kingdom
Prior art keywords
bridge
eddy current
circuit
current test
detected
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
GB2552869A
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
Priority claimed from JP1681469A external-priority patent/JPS5036188B1/ja
Application filed by Nippon Kokan Ltd filed Critical Nippon Kokan Ltd
Publication of GB1275104A publication Critical patent/GB1275104A/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
    • 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

Abstract

1275104 Eddy current flaw testing NIPPON KOKAN K K 19 May 1969 [17 May 1968; 7 March 1969] 25528/69 Heading G1N In a flaw detector having eddy current test coils in a bridge circuit 1, the bridge balance is stabilized by an arrangement in which two quadrature components of the bridge output signal are detected in synchronous detectors 10, 11 and used to control the gains of two amplifiers 12, 13 feeding, via a combining circuit 14, quadrature correction signals to the bridge. A circuit A, having a large time constant when its input is positive and increasing and a small time constant when its input is negative or decreasing, may be interposed between 11 and 13 and/or 10 and 12 to allow rapid balance adjustments of the bridge circuit as a specimen enters the apparatus and slow balance adjustments as the specimen leaves the apparatus. The bridge output is detected by a synchronous detector 6 and fed to a recorder (not shown). An oscilloscope 5 is provided.
GB2552869A 1968-05-17 1969-05-19 Eddy current test apparatus Expired GB1275104A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3281568 1968-05-17
JP1681469A JPS5036188B1 (en) 1969-03-07 1969-03-07

Publications (1)

Publication Number Publication Date
GB1275104A true GB1275104A (en) 1972-05-24

Family

ID=26353216

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2552869A Expired GB1275104A (en) 1968-05-17 1969-05-19 Eddy current test apparatus

Country Status (3)

Country Link
DE (1) DE1925354C3 (en)
FR (1) FR2008784A1 (en)
GB (1) GB1275104A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4006407A (en) * 1975-03-10 1977-02-01 Magnaflux Corporation Non-destructive testing systems having automatic balance and sample and hold operational modes

Also Published As

Publication number Publication date
DE1925354C3 (en) 1980-01-31
FR2008784A1 (en) 1970-01-23
DE1925354A1 (en) 1969-12-18
DE1925354B2 (en) 1979-05-17

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees