Active reflex optical range finder

Details Active reflex optical range finder Active reflex optical range finder

1997-05-12

1998-09-01

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 731, G01C 308, G01N 2100

Patent

active

058018182

ABSTRACT:
A measuring system includes a first circuit that produces a first signal. A transmission line has a first end and a second end where the first end is interconnected with the first circuit so as to receive the first signal. A second circuit is remotely located from the first end of the transmission line and interconnected with the second end of the transmission line so as to detect the first signal. The second circuit in response to detecting the first signal produces a second signal that is received by the second end of the transmission line. The first circuit detects the second signal and in response determines the length of the transmission line. The first signal and the second signal preferably have different frequencies and the transmission line is preferably a fiber optic cable.

REFERENCES:
patent: 3981592 (1976-09-01), Williams
patent: 4994675 (1991-02-01), Levin et al.
patent: 5149961 (1992-09-01), Arnold et al.
patent: 5455672 (1995-10-01), Lamonde et al.
TIA/EIA Standard --Commercial Building Telecommunications Cabling Standard --Oct. 1995.

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