(57) 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 θ, 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·cosθ.
|
|
