V(x,t) acoustic microscopy method for leaky surface acoustic waves parameters measurements

Abstract

In this paper, a new method for the measurement of the acoustical parameters of the laterally uniform specimen is considered. Two focused large angular aperture transducers are used in this technique. Foci of the transducers are placed on the specimen surface and received voltage V(x,t) is acquired during the relative transducers translation along the specimen surface. Due to geometry of the ultrasonic system, angular range of the generated and detected waves can be close to (0, /spl pi//2) and the length of the recording distance is unlimited. Velocity and attenuation of the leaky wave measured by this method do not depend on the temperature of the immersion liquid. Also, contrary to V(z) method, angular resolution of the V(x,t) method is better for small incident angles.