Hitachi-ge Nuclear Energy, Ltd.

Hidetaka Komuro

Sou Kitazawa

Junichiro Naganuma

Kazuya Ehara

An ultrasonic flaw detection method and device identifies echoes appearing in flaw detection images. By selecting and controlling combinations of transmitting elements and receiving elements, plural waveform signals c are recorded. For each position in an inspection object, intensities of plural waveform signals are extracted based on the propagation time of ultrasonic waves and are totalized. A flaw detection image showing distribution of totalized intensities is generated. By selectively using at least three sound velocities for calculating propagation time of ultrasonic waves, at least three flaw detection images are generated. The areas of at least three echoes respectively appearing in the flaw detection images are calculated and the echo area which is the smallest is identified according to whether or not the flaw detection image showing the echo is one generated using one of a longitudinal sound velocity, a transverse sound velocity and a medium sound velocity.

Ultrasonic flaw detection method and apparatus

There is provided, for example, an ultrasonic probe capable of improving the accuracy of testing of a curved-surface structure. An array sensor (ultrasonic array sensor) includes multiple elements (oscillators) to generate an ultrasonic wave. Water (propagation member) is disposed between the array sensor and steel (test target) to propagate the ultrasonic wave. At least one reflection section reflects the ultrasonic wave reflected and returned from the surface of or the inside of the steel, and causes the ultrasonic wave to fall on any of the elements.

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Hitachi, Japan

Hidetaka Komuro