Abstract
Studies of ultrasonic transients generated by pulses of laser ultraviolet light on plates of various thickness are presented. The propagation of the first train carrying most of the elastic energy was investigated. The experimental method used resulted in a precise determination of propagation velocities of the elastic signal. A comparison of the experimental and computed results led to the conclusion that the signal corresponded to the lowest antisymmetric Lamb mode. The mode group velocity was equal to the Rayleigh wave velocity, c R, for reduced wave numbers greater than 6.5. The group velocity became different from c R for smaller reduced wave numbers. It is suggested that the experimental method may be used for precise determination of Poisson ratio for metallic samples.
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