Method and apparatus for measuring the distance and/or relative

Details Method and apparatus for measuring the distance and/or relative Method and apparatus for measuring the distance and/or relative

1979-05-31

1981-10-27

Buczinski, S. C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 4, G01C 308

Patent

active

042970300

ABSTRACT:
The distance between a target and a measuring point is measured by optical and electronic elements forming an opto-electronic circuit arrangement wherein a light beam is modulated by a first frequency signal. The light beam is divided to produce a measuring beam and a reference beam. The measuring beam as reflected from the target and the reference beam are supplied through a single light scanner to a light sensitive detector in accordance with a predetermined scanning or sequencing function. The output signal of the detector and a second frequency signal are supplied to a mixing stage to form an intermediate frequency signal. A digital counter receives a start counting signal coinciding with the receipt of the the reference beam and a stop counting signal coinciding with the return of the reflected beam. The digital counter is operated as a dynamic memory because in the present system the phase which exists at the instant of switching the scanner to receiving the reference beam, is continuously repeated whereby a true single channel system is accomplished. A second counter counts pulses within the time raster established by the dynamic memory counter.

REFERENCES:
patent: 3619058 (1971-11-01), Hewlett et al.
patent: 3652161 (1972-03-01), Ross
patent: 3690767 (1972-09-01), Missio et al.
patent: 3728025 (1973-04-01), Madigan et al.
patent: 3765768 (1973-10-01), Budin et al.
patent: 3778160 (1973-12-01), Wolcott
patent: 3900260 (1975-08-01), Wendt

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