Optical electronic distance measuring apparatus with movable mir

Details Optical electronic distance measuring apparatus with movable mir Optical electronic distance measuring apparatus with movable mir

1993-05-27

1995-10-03

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 311, 3561411, 3561522, 3561523, 356376, 356 2, G01C 308, G01C 300, G01B 1126, G01B 1124

Patent

active

054556708

ABSTRACT:
A rangefinder system employs three laser rangefinders for determining three dimensional coordinates, each rangefinder using a steerable mirror for aiming the rangefinder beams at a series of retroreflectors. The beams are modulated at 1.5 GHz. The system includes a signal at an offset frequency of 1 kHz for phase detection. A digital phase detector under control of a local computer, as is the mirror, computes phase difference which is used to measure the distances to the retroreflectors. Correction is made for zero point phase drift of the circuit of each rangefinder and a benchmark reference to a distant retroreflector corrects for atmospheric effects on the measurements. A central computer directs the implementation of the tasks of the local computers of each rangefinder and computes and displays trilateration computation results made from the three rangefinders. The system can measure the distance to five different points per second with ranges up to 120 m at all accuracy of about 50 .mu.m.

REFERENCES:
patent: 3809477 (1974-05-01), Russell
patent: 4274736 (1981-06-01), Balmer
patent: 4457625 (1984-07-01), Greenleaf et al.
patent: 4560271 (1985-12-01), Fumio
patent: 4810088 (1989-03-01), Karning et al.
J. M. Payne; Rev. of Scientific Instr.; vol. 44, #3; Mar. 1973; p. 304.
J. M. Payne et al.; Rev. of Scientific Instr.; vol. 63, #6; Jun. 1992; p. 3311.

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