NASA NTRS · 19780000248
Pseudo-continuous-wave acoustic instrument
Abstract
Simple, inexpensive, and portable ultrasonic device accurately measures acoustic properties of liquids, gases, and solids, using pseudo-continuous wave responses from samples to measure change in resonant frequency or amplitude in acoustic signal.
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Heyman, J. S., Stone, F. D.. 1978-10-01. Pseudo-continuous-wave acoustic instrument. https://ntrs.nasa.gov/citations/19780000248
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