Sonic measuring system

Details Sonic measuring system Sonic measuring system

1976-07-14

1977-10-25

Farley, Richard A.

Communications: electrical

Selective

System having rectifier

340 1C, 343112D, G01S 1100

Patent

active

040558304

ABSTRACT:
A distance measuring system which utilizes sound waves. The first unit can be separate or combined radio transmitter and sound sensor which is held at one of the two points between which the distance is to be measured. This sound sensor unit also has a radio receiver in it. At the other point there is a second unit. This second unit combines both a radio receiver and sound source. In addition there is distance indicating circuitry in the first unit which counts pulses corresponding to distance, and then visually displays the total number of pulses as a measured distance between points based upon the known speed of sound in air at a specific temperature. Initially, the radio transmitter emits a fixed frequency carrier wave which simultaneously triggers the sending by the sound source of a low frequency sound wave and the starting of a counter in the sound sensor. Since the radio wave is traveling at the speed of light its travel speed can be considered infinite when compared to the much slower traveling sound wave. When the slower sound wave is received by the sound sensor unit it is detected, amplified, filtered, changed to a dc electrical signal, differentiated, and acts as a stop pulse for the counter. The accumulated number of pulses, corresponding to the distance between sound source and sensor, is then displayed.

REFERENCES:
patent: 684706 (1901-10-01), Mundy
patent: 3076519 (1963-02-01), Alsabrook
patent: 3528053 (1970-09-01), Rubin
patent: 3566348 (1971-02-01), Leyden et al.
patent: 3745517 (1973-07-01), Sochard
patent: 3757285 (1973-09-01), Ferre

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