| 摘要 |
An ultrasonic testing apparatus 100 comprises an ultrasonic probe 1 including n (n ‰¥ 2) number of transducers arranged along a predetermined direction, disposed so as to face a test object P, and a transmission/reception control device 2 for selecting m (n > m ‰¥ 1) number of transducers from among the n number of transducers, transmitting ultrasonic waves from the selected m number of transducers toward the test object, receiving the ultrasonic waves therefrom, and switched m number of transducers to b selected successively. If an angle that the arrangement direction of the transducers makes with the surface of the test object which ultrasonic waves enter is ¸, and the effective beam width of each selected m number of transducers with respect to a target flaw is W1, the transmission/reception control device switches m number of transducers to be selected successively by a switching pitch length P satisfying the formula: P ‰¤ W1·cos¸. |
