Laser distance measuring apparatus

Details Laser distance measuring apparatus Laser distance measuring apparatus

1978-10-05

1980-01-01

Buczinski, S. C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

343 12R, G01C 308

Patent

active

041814312

ABSTRACT:
The present apparatus measures distance with the aid of a laser beam. A reference channel provides a signal in response to the emission of a laser beam. A measuring channel provides a stop signal. Both channels are substantially identical and each includes an input circuit with a light sensitive diode having a barrier layer capacity. The input circuit is so arranged that the barrier layer capacity is connected in parallel to a parallel resonance circuit which is triggered by its respective light sensitive diode to generate a damped sine wave. In the reference channel the first passage through zero of the damped sine wave is detected. In the measuring channel the second passage through zero of the damped sine wave is detected. Thus, the time significant impulse flanks are precisely determined.

REFERENCES:
patent: 3813165 (1974-05-01), Hines et al.
patent: 3869207 (1975-03-01), Hermet et al.
patent: 3900261 (1975-08-01), Wingate
patent: 3992615 (1976-11-01), Bennett et al.

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