Method of and system for measuring distances

Details Method of and system for measuring distances Method of and system for measuring distances

1976-12-10

1978-09-12

Buczinski, S. C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

343 65R, 356 28, G01C 308, G01S 956

Patent

active

041133820

ABSTRACT:
To measure the distance between a master station at a first location and a slave station at a second location, an interrogation pulse -- e.g. of light -- sent out by a transmitter at the master station is intercepted by a receiver at the slave station and, after a delay period T, triggers a transmitter at the latter station to send back a reply pulse to a receiver at the master station. The reply pulse starts another delay period T at the slave station, followed by the emission of a follow-up pulse. At the master station, the duration of the delay period T -- as measured from the arrival of the reply pulse to that of the follow-up pulse -- is deducted from the time measured between the emission of the interrogation pulse and the reception of the reply pulse to give an indication of the distance between the stations. Since this indication is independent of T, the delay period may be made variable to serve as a gauge for some other quantity such as the speed of a vehicle carrying the slave station.

REFERENCES:
patent: 3780370 (1973-12-01), Reeves
patent: 3945006 (1976-03-01), Cleeton
patent: 4026654 (1977-05-01), Beaurain

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