Distance measuring laser apparatus for delayed time measurements

Details Distance measuring laser apparatus for delayed time measurements Distance measuring laser apparatus for delayed time measurements

1977-07-18

1979-02-13

Heyman, John S.

Optics: measuring and testing

Range or remote distance finding

With photodetection

343 12R, 307312, 307354, 307320, 328223, G01C 308

Patent

active

041393015

ABSTRACT:
The present distance measuring laser apparatus measures the delayed time occurring between two signals derived from a laser beam and a reflected light beam and received in two separate channels. One channel is the reference channel and provides a starting signal when a light signal is emitted by the laser. The other channel is the measuring channel and provides a stop signal at the time of the return of a reflected light beam. An identical input circuit is provided in each signal channel. The receiver input rectifier or diode of each input circuit has a working impedance including a parallel resonance circuit made up of the barrier layer capacity of the diode, of an inductance coil and a further, external capacity.

REFERENCES:
patent: 3723002 (1973-03-01), Everest et al.
patent: 3830567 (1974-08-01), Riegl
patent: 3869207 (1975-03-01), Hermet et al.
patent: 3877813 (1975-04-01), Hayes et al.
patent: 3911297 (1975-10-01), Merrin et al.

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