Method and apparatus for determining physical quantities

Details Method and apparatus for determining physical quantities Method and apparatus for determining physical quantities

1981-03-18

1983-06-14

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Transponders

367 95, 367108, 367117, 367902, G01B 1700, G01S 1510

Patent

active

043887082

ABSTRACT:
A distance R to be measured is derived by measuring the spacing x.sub.m between a fixed transmitter Tx and a movable receiver Rx, and comparing this with the reference spacing x.sub.ref between a fixed transmitter Tx' and receiver Rx. Each spacing is measured by passing a large number of pulses sequentially from receiver to transmitter through a coupling medium, the receipt of one pulse triggering transmission of the next. The spacing is derived from the time T taken to pass n pulses; preferably n is fixed and T is measured.

REFERENCES:
patent: 2400309 (1946-05-01), Kock
patent: 2568926 (1951-09-01), Moran, Jr.
patent: 3076519 (1963-02-01), Alsabrook
patent: 3100885 (1963-08-01), Welkowitz et al.
patent: 3115615 (1963-12-01), Saper
patent: 3503680 (1970-03-01), Schenkerman

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