NASA NTRS · 19930019895
Constant frequency pulsed phase-locked loop measuring device
Abstract
A measuring apparatus is presented that uses a fixed frequency oscillator to measure small changes in the phase velocity ultrasonic sound when a sample is exposed to environmental changes such as changes in pressure, temperature, etc. The invention automatically balances electrical phase shifts against the acoustical phase shifts in order to obtain an accurate measurement of electrical phase shifts.
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Yost, William T., Kushnick, Peter W., Cantrell, John H.. 1993-06-01. Constant frequency pulsed phase-locked loop measuring device. https://ntrs.nasa.gov/citations/19930019895
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