Constant frequency pulsed phase-locked loop measuring device

Details Constant frequency pulsed phase-locked loop measuring device Constant frequency pulsed phase-locked loop measuring device

1991-08-26

1993-06-01

Williams, Hezron E.

Measuring and testing

Gas analysis

By vibration

374119, 73 597, 73 32A, 73 6175, 73 6179, 73 6453, G01N 2918, G01N 924

Patent

active

052149552

ABSTRACT:
A measuring apparatus 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.

REFERENCES:
patent: 3614226 (1971-10-01), Vergoz
patent: 3802271 (1974-04-01), Bertelson
patent: 4114455 (1978-09-01), Walker
patent: 4185498 (1980-01-01), Watson et al.
patent: 4244226 (1981-01-01), Green et al.
patent: 4363242 (1982-12-01), Heyman
patent: 4497208 (1985-02-01), Oja et al.
patent: 4546641 (1985-10-01), Nguyen
patent: 4624142 (1986-11-01), Heyman

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