| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultrasonic probe capable of accurately measuring the propagation speed of the ultrasonic wave propagated through a fatigue degree measuring target. SOLUTION: First, second and third vibrators 3, 4 and 5 are arranged in the spherical surface-shaped recessed part of a backing member 1 so that the ultrasonic wave receiving surfaces 14, 15 and 16 of three vibrators 3, 4 and 5 are positioned on the large circle 18 of an imaginary spherical surface at an equal interval in a mutual non-contact state. Serrated waves wherein ridges and troughs are alternately repeated in the direction almost vertical to the peripheral direction of the large circle 18 are formed to the edges of the first vibrator 3 of one end and the third vibrator 5 of the other end. COPYRIGHT: (C)2007,JPO&INPIT
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