Hitachi, Ltd.

Mitsuyuki Oda

Sakae Sugiyama

Izumi Kobayashi

Hiroyuki Takeda

Yohsuke Ojiri

Kunio Kudo

In ultrasonic flaw inspection for determining the size of a flaw by emitting an ultrasonic wave to a subject via a probe and receiving an ultrasonic echo from said flaw existing inside said subject, changes in the propagation distances of the ultrasonic echoes before and after movement of said probe through a micro-small distance are compared with each other and the ultrasonic echoes are determined to result from the same flaw if the change width falls within a predetermined value determined by the angle of incidence of the ultrasonic wave and the directional angle.

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Tokyo, Japan

Mitsuyuki Oda