Distance measuring device

Details Distance measuring device Distance measuring device

1991-09-05

1993-03-16

Hellner, Mark

Optics: measuring and testing

Range or remote distance finding

With photodetection

G01C 308

Patent

active

051949067

ABSTRACT:
A distance measuring device using two kinds of modulation frequencies is disclosed. More particularly, the distance measuring device is an electro-optical distance meter for measuring a distance by combining the results of fine measurement and rough measurement. The fine measurement is effected by detecting a phase difference between a modulation signal generated from a light emitting device and a reflected modulation signal generated from a light receiving device, while the rough measurement is effected by measuring a lag time between the modulation signal and the reflected modulation signal. Further, the distance may be measured by detecting a phase difference and a lag time of a multiplex modulation signal, in which the measurements of the phase difference and the lag time may be carried out in parallel with use of a single frequency. Particularly, a measuring time can be shortened as compared with that in an electro-optical distance meter time-divisionally using three frequencies.

REFERENCES:
patent: 4537502 (1985-08-01), Miller et al.
patent: 4744653 (1988-05-01), Sano et al.
patent: 4856893 (1989-08-01), Breen
patent: 4942561 (1990-07-01), Ohishi et al.
patent: 5082364 (1992-01-01), Russell

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