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Apparatus for measuring ultrasonic wave velocities and hence elastic moduli by means of phase-comparison methods at frequencies as high as 500 Mc is described. Gated harmonic generators for providing pulse-modulated rf of accurately known carrier frequency and circuits for electrical coupling to resonant quartz-crystal transducers are discussed. Application to measurements on small specimens, with illustrative data for cadmium telluride, is made.
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H. J. McSkimin (1962) studied this question.
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