Method for measuring distance and optical distance meter

Details Method for measuring distance and optical distance meter Method for measuring distance and optical distance meter

1984-11-28

1986-04-22

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250338, 250341, 356 4, 33125A, G01C 308

Patent

active

045844771

ABSTRACT:
In a method of distance measuring and an optical distance measuring apparatus, a pulse-modulated infrared light beam is irradiated to an object to produce a reflected light beam, which is then received by a resonance circuit, and intensity of output of the resonance circuit is measured, wherein the modulation of frequency is sweepingly varied within a predetermined narrow frequency range; thereby, even when the circuit constants of the resonance circuit varies due to temperature change and so on, the distance measurement result is not affected, and stable measurement of a long distance is possible.

REFERENCES:
patent: 3082324 (1963-03-01), Schuck
patent: 3649123 (1972-03-01), Ulicki
patent: 3841755 (1974-10-01), Debart
Anon., "Camera's Infrared Eye Focuses on New Vistas for Ranging", Electronics (Apr. 27, 1970) pp. 102-105.

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