Measurement system using sonic and ultrasonic waves

Details Measurement system using sonic and ultrasonic waves Measurement system using sonic and ultrasonic waves

1986-06-16

1988-06-21

Levy, Stewart J.

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

By combining or comparing signals

73597, G01N 2900

Patent

active

047529172

ABSTRACT:
In a displacement measurement system using waves in the sonic to ultrasonic range, a constant wavelength of the sonic or ultrasonic wave is established by driving the wave transmitter by a variable frequency oscillator whose frequency is varied as a function of a control voltage. The control voltage is varied as a function of the phase differential between the wave transmitted by the transmitter and the wave received by reference receiver to maintain both waves in phase.

REFERENCES:
patent: 3121955 (1964-02-01), King
patent: 4210969 (1980-07-01), Massa
patent: 4231260 (1980-11-01), Chamuel
patent: 4494224 (1985-01-01), Morrell et al.
IBM Technical Disclosure Bulletin, vol. 27, No. 3, Aug. 1984, F. R. Koperda & Vandenberg, Ultrasonic Pos. Indic.

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