Apparatus for measuring distances by measuring time of travel of

Details Apparatus for measuring distances by measuring time of travel of Apparatus for measuring distances by measuring time of travel of

1984-09-26

1985-06-04

Buczinski, S. C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

343 13R, 367 97, G01C 308, G01S 1310

Patent

active

045211078

ABSTRACT:
An apparatus measures the distance of a target by measuring the time of travel of a light pulse from the measuring apparatus to the target and back wherein it is important to achieve high accuracy in timing to correlate, for a distant target, the time of transmission with the start of measuring the time of travel and the time of receiving a reflected light pulse and the end of the time measurement. For a near target, the start of distance measurement is correlated with receipt of a reflected measuring light pulse and a stop signal is correlated with a delayed reference light pulse. For this purpose a reference light pulse is branched off from a measuring light pulse and passed by light guides to a single receiver unit. The reference light pulse is passed to the receiver unit either through a short or a long light path depending on whether the target is distant or near, respectively. Attenuators are provided in each path to insure that the start and end of a time measurement of target distance can be performed without interfering signals.

REFERENCES:
patent: 3390348 (1968-06-01), Granqvist
patent: 3539978 (1970-11-01), Stedtnitz
patent: 3680964 (1972-08-01), Granqvist
patent: 3740141 (1973-06-01), DeWitt, Jr.
patent: 3752582 (1973-08-01), Troll et al.
patent: 3779645 (1973-12-01), Nakazawa et al.
patent: 3898007 (1975-08-01), Wiklund
patent: 3992615 (1976-11-01), Bennett et al.
patent: 4113381 (1978-09-01), Epstein
patent: 4181431 (1980-01-01), Chaborski

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