JPS5535231A - Eddy current defect detecting method by rectangular pulse excitation - Google Patents

Eddy current defect detecting method by rectangular pulse excitation

Info

Publication number
JPS5535231A
JPS5535231A JP10810278A JP10810278A JPS5535231A JP S5535231 A JPS5535231 A JP S5535231A JP 10810278 A JP10810278 A JP 10810278A JP 10810278 A JP10810278 A JP 10810278A JP S5535231 A JPS5535231 A JP S5535231A
Authority
JP
Japan
Prior art keywords
defect
pulse
type
rectangular
eddy current
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
JP10810278A
Other languages
Japanese (ja)
Inventor
Masayuki Yabe
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.)
TEITSUU DENSHI KENKYUSHO KK
Original Assignee
TEITSUU DENSHI KENKYUSHO KK
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 TEITSUU DENSHI KENKYUSHO KK filed Critical TEITSUU DENSHI KENKYUSHO KK
Priority to JP10810278A priority Critical patent/JPS5535231A/en
Publication of JPS5535231A publication Critical patent/JPS5535231A/en
Pending legal-status Critical Current

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

Abstract

PURPOSE: To make it possible to check the existence of a defect and to detect depth and shape defects, by making a decision on variation of transient response characteristics due to rectangular pulse vibrations.
CONSTITUTION: When a coil forming an insertion-type, penetration-type and differential-type self-comparison type bridge of a steel pipe or rod is excited by rectangular pulses from rectangular-pulse oscillator 1, a steep pulse voltage is developed at the rise and fall of the pulse and then applied to differential amplifier 4 via balancing circuit 3. The penetration depth of an eddy current varying in penetration depth due to a defect of the pipe or rod decreases as a frequency increases. Therefore, decidion unit 5 of an oscilloscope, etc., makes a decision on the voltage waveform corresponding to transient characteristics of the output of amplifier 4, so that the existence of a defect will be detected as well as the depth and shape of the defect.
COPYRIGHT: (C)1980,JPO&Japio
JP10810278A 1978-09-05 1978-09-05 Eddy current defect detecting method by rectangular pulse excitation Pending JPS5535231A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10810278A JPS5535231A (en) 1978-09-05 1978-09-05 Eddy current defect detecting method by rectangular pulse excitation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10810278A JPS5535231A (en) 1978-09-05 1978-09-05 Eddy current defect detecting method by rectangular pulse excitation

Publications (1)

Publication Number Publication Date
JPS5535231A true JPS5535231A (en) 1980-03-12

Family

ID=14475915

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10810278A Pending JPS5535231A (en) 1978-09-05 1978-09-05 Eddy current defect detecting method by rectangular pulse excitation

Country Status (1)

Country Link
JP (1) JPS5535231A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60257960A (en) * 1984-06-04 1985-12-19 Mitsubishi Heavy Ind Ltd Centrifugal casting method of two layers
JP2007218801A (en) * 2006-02-17 2007-08-30 Magnegraph:Kk Measuring apparatus and measuring method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3361960A (en) * 1964-07-09 1968-01-02 Atomic Energy Commission Usa Pulsed nondestructive eddy current testing device using shielded specimen encircling coils

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3361960A (en) * 1964-07-09 1968-01-02 Atomic Energy Commission Usa Pulsed nondestructive eddy current testing device using shielded specimen encircling coils

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60257960A (en) * 1984-06-04 1985-12-19 Mitsubishi Heavy Ind Ltd Centrifugal casting method of two layers
JP2007218801A (en) * 2006-02-17 2007-08-30 Magnegraph:Kk Measuring apparatus and measuring method

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