Hitachi, Ltd.

Takao Shimura

Tetsuya Matsui

Naoyuki Kono

Masahiro Koike

Masahiro Tooma

Makoto Senoo

Hirokazu Adachi

An ultrasonic inspection instrument for detecting a crack and performing sizing in the depth direction of the crack. By a transmitter element array and a receiver element array included in a common sensor, focus points between focused acoustic fields are electronically scanned in a range including a location where half the sum of the transmitting angle of ultrasonic waves to an inspection-target material and the receiving angle of diffraction echoes from the inspection-target material is 30 degrees, so that a tip portion of the crack is detected from the received diffraction echoes. Thus, the detectability of the ultrasonic inspection instrument for detecting diffraction waves in a subject to be inspected and performing crack inspection is stabilized and kept high.

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Hitachi, Japan

Takao Shimura