Ultrasonic position sensor

Details Ultrasonic position sensor Ultrasonic position sensor

1995-06-07

1997-01-07

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

331155, 356373, H03B 530, G01B 1114

Patent

active

055919146

ABSTRACT:
A position sensor for measuring the distance from a first position to a second position. The sensor may include an elastic wave generator, an acoustical path over which the elastic wave passes, and a transducer to which the wave passes. A measurement loop includes the acoustical path, and has electrical and optical elements. The electrical elements may compare the phases of the transducer signals from which the change in position between the first and second positions are determined. Alternatively, the measurement loop may comprise a feedback loop to produce oscillations and an output frequency. A frequency counter is included in the feedback loop to measure frequency.

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patent: 4484820 (1984-11-01), Rosencwaig
patent: 4577508 (1986-03-01), Chaplin
patent: 4624142 (1986-11-01), Heyman
patent: 4752917 (1988-06-01), Dechape
patent: 4833928 (1989-05-01), Luukkala et al.
patent: 4928527 (1990-05-01), Burger et al.
S. Wenzel, et al., "Ultrasonic-Oscillator Position Sensor," pp. 1-4, presented at the IEEE Ultrasonic Symposium, Oct. 1987, Denver, CO.
R. White, et al., "Ultrasonic-Oscillator Position Sensor," pp. 487-490, Transducers '87.
A. Young, et al., "A Twin-Interferometer Fiber-Optic Readout for Diaphragm Pressure Transducers," pp, 19-22, IEEE publication, Apr. 1988.

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