Abstract
A continuous wave ultrasonic measurement technique, which is particularly well suited to the study of inherently single-ended acoustic systems, is presented. In this method the cw signal which establishes acoustic resonance is interrupted for the period during which sampling of particle motion amplitude is accomplished. The ``sampled-cw'' technique incorporates the freedom from crosstalk associated with pulse—echo methods while retaining the monochromaticity of cw schemes. Analyses of the relative sensitivities of pulse—echo, ``sampled-cw,'' and cw ultrasonic techniques are presented. A detailed description is given of a sampled-cw spectrometer which includes a frequency locking scheme.
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