Measurement of distance using ultrasonic signals

Details Measurement of distance using ultrasonic signals Measurement of distance using ultrasonic signals

1979-06-22

1981-03-03

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Transponders

367902, G01S 1508

Patent

active

042544785

ABSTRACT:
In the measurement of the distance between two immersed points using ultrasonic signals, a control beacon is located at one point and a servo-beacon at the other point. The control beacon emits a first signal which is received by the servo-beacon. After a set period of time T sufficient for the disappearance of all echoes, the servo-beacon emits a signal which is received by the control beacon. Measurement apparatus associated with the control beacon determines the distance as a function of the time between emission of the first signal by the control beacon and reception of the signal from the servo-beacon, and the velocity of the ultrasonic signal which is determined in the region of the control beacon.

REFERENCES:
patent: 3237150 (1966-02-01), Beck et al.
patent: 3495208 (1970-02-01), Grada
patent: 4026654 (1977-05-01), Beaurain

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