Method of making self-calibrated displacement measurements

Details Method of making self-calibrated displacement measurements Method of making self-calibrated displacement measurements

1975-02-24

1977-02-15

Goldstein, Herbert

Communications: electrical

Selective

73 78R, 73552, 176 19R, G01S 968

Patent

active

040084558

ABSTRACT:
A method for monitoring the displacement of an object having an acoustically reflective surface at least partially submerged in an acoustically conductive medium. The reflective surface is designed to have a stepped interface responsive to an incident acoustic pulse to provide separate discrete reflected pulses to a receiving transducer. The difference in the time of flight of the reflected acoustic signals corresponds to the known step height and the time of travel of the signals to the receiving transducer provides a measure of the displacement of the object. Accordingly, the reference step length enables simultaneous calibration of each displacement measurement.

REFERENCES:
patent: 2931978 (1960-04-01), Erdman
patent: 3237150 (1966-02-01), Beck et al.
patent: 3789663 (1974-02-01), Gold
Lynnworth et al., "Nuclear Reactor Applications of New Ultrasonic Transducers," Nuclear Science Symposium, Nov. 1970, pp. 351-362.

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