Abstract
An interdigital transducer (IDT) for leaky waves in a layered substrate composed of a piezoelectric ceramic thin plate and an acryl plate is incorporated into a C-mode acoustical imaging system. The transducer performance in the layered structure is described from the viewpoint of ultrasound radiation at an interface between an acryl plate and a water layer. The leaky wave transducer has frequency-dependent radiation angles, corresponding to the leaky wave velocity, under multiple operation modes. The bulk wave direction in a test sample via the longitudinal wave in the water layer is easily controlled by frequency change. A reflection type C-mode acoustical imaging system is successfully demonstrated for nondestructive testing.
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