DEFECT INSPECTION METHOD AND DEFECT INSPECTION DEVICE

WIPO Patent Application WO/2014/097704

A1

A defect inspection method has: a first step of generating an ultrasonic vibration in a test object by applying a high frequency signal to a plurality of coils that are arranged to be mutually adjacent in a partially overlapping manner in an electromagnetic ultrasonic probe; a second step of receiving bottom echoes of the electromagnetic ultrasonic probe with each of the plurality of coils; a third step of receiving flaw echoes of the electromagnetic ultrasonic probe with each of the plurality of coils; a fourth step of correcting the signal strength of the bottom echoes received with each of the plurality of coils on the basis of the operational status of the plurality of coils; and a fifth step of calculating the ratio of the flaw echo signal strength to the corrected bottom echo signal strength for each of the plurality of coils, and evaluating internal defects of the test object on basis of those calculation results.

JPS5829461	[Title of the Invention] An ultrasonic fault detection method by a surface wave of a steel plate
JP2564558	[Name of device] Ultrasonic flaw detector
JPS62228156	METHOD FOR PREVENTING DEFLECTION OF WIRE MATERIAL IN WIRE MATERIAL FLAW DETECTOR

IKEDA KEISHIRO (JP)
TASAKA TAKAHIRO (JP)
IIHOSHI MASANORI (JP)

PCT/JP2013/076211

June 26, 2014

September 27, 2013

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NIPPON STEEL & SUMITOMO METAL CORP (JP)

G01N29/04; G01N29/30

JP2008139325A	2008-06-19
JP2010258357A	2010-11-11
JP2002090349A	2002-03-27
JPH10506183A	1998-06-16
JP2005214686A	2005-08-11

SHIGA Masatake et al. (JP)
Masatake Shiga (JP)

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