JPS5460988A - Signal processing method of eddy current flaw detecting apparatus - Google Patents

Signal processing method of eddy current flaw detecting apparatus

Info

Publication number
JPS5460988A
JPS5460988A JP12705277A JP12705277A JPS5460988A JP S5460988 A JPS5460988 A JP S5460988A JP 12705277 A JP12705277 A JP 12705277A JP 12705277 A JP12705277 A JP 12705277A JP S5460988 A JPS5460988 A JP S5460988A
Authority
JP
Japan
Prior art keywords
phase difference
measurement circuit
standard
bridge
signal
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.)
Pending
Application number
JP12705277A
Other languages
Japanese (ja)
Inventor
Susumu Ihara
Yuzo Otawara
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.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries 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 Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Priority to JP12705277A priority Critical patent/JPS5460988A/en
Publication of JPS5460988A publication Critical patent/JPS5460988A/en
Pending legal-status Critical Current

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  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

PURPOSE: To surely discriminate various flaws by connecting two A/D converters to a phase difference measurement circuit and separately drawing out the unbalance voltage component of the bridge output signal and the phase difference of the brigde output for standard signal.
CONSTITUTION: A sine wave oscillator 1 of a frequency (f) and a bridge circuit 3 wherein the detection coil 2 cont nuously inserted with the object being examined is its arm are subsequently connected to an A/D converter 9. On the other hand, the oscillator 1 is connected to the A/D converter 9' via standard phase shifter 5. The respedtiv outputs thereof are inputted via peak detectors 10, 10' to a phase difference measurement circuit 11, from which the unbalance voltage component of the bridge output signal and the phase difference of the bridge output for a standard sine wave signal are separately drawn out. By inputting the output of the phase difference measurement circuit 11 directly into a computer, etc. and analyzing data in this way, the kinds of various flaws may be discriminated
COPYRIGHT: (C)1979,JPO&Japio
JP12705277A 1977-10-22 1977-10-22 Signal processing method of eddy current flaw detecting apparatus Pending JPS5460988A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12705277A JPS5460988A (en) 1977-10-22 1977-10-22 Signal processing method of eddy current flaw detecting apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12705277A JPS5460988A (en) 1977-10-22 1977-10-22 Signal processing method of eddy current flaw detecting apparatus

Publications (1)

Publication Number Publication Date
JPS5460988A true JPS5460988A (en) 1979-05-16

Family

ID=14950402

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12705277A Pending JPS5460988A (en) 1977-10-22 1977-10-22 Signal processing method of eddy current flaw detecting apparatus

Country Status (1)

Country Link
JP (1) JPS5460988A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4034817A1 (en) * 1989-11-06 1991-05-08 Gen Electric DEVICE AND METHOD FOR IMPROVING THE eddy current

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4034817A1 (en) * 1989-11-06 1991-05-08 Gen Electric DEVICE AND METHOD FOR IMPROVING THE eddy current

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