Ultrasonic flaw detection apparatus and ultrasonic flaw...

Measuring and testing – Vibration – By mechanical waves

Reexamination Certificate

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C073S599000, C073S600000, C073S602000, C073S627000

Reexamination Certificate

active

07900516

ABSTRACT:
To simply and accurately determine the position of an edge, the depth or the height of a flaw including a surface crack, a corroded portion near the surface layer of a thick specimen, and a minute damage.An ultrasonic flaw detection method causes an ultrasonic wave16to be incident on a specimen6from an oblique direction, detects a diffracted wave17generated at an edge of a flaw20in the specimen6above the flaw, and determines the position of the edge of the flaw20from a front surface13of the specimen6using a triangular method from an entire beam path Wt of a component18, which directly propagates above the flaw20, of the diffracted wave, the entire beam path passing through the flaw from the position of incidence of the component18, and an interval S between the position of incidence and the position of detection of the ultrasonic wave or from the difference (tt−ts) between the propagation time of a surface wave15, to which the above relations reflect, to reception and the propagation time of the diffracted wave18, which directly propagates above the flaw, to reception.

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