Abstract
A pulse-modulated, 10- to 30-mc oscillator is used to apply pulses of r-f voltage to piezoelectric crystals attached to solid samples. The transmitted pulse is amplified, detected, and returned to the pulsed oscillator as a trigger voltage. The number of pulses occurring per second is then a function of the electrical and acoustic delay. Since the latter is a function of temperature, small changes in sound velocity can be determined from observed differences in the repetition frequency of the pulsed oscillator after correcting for changes in acoustic path length caused by linear expansion. Repetition frequencies in the region 50,000 to 100,000 per second are used.
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