Optical range finder

Details Optical range finder Optical range finder

1990-11-13

1992-06-30

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

342 86, 342103, G01C 308

Patent

active

051257360

ABSTRACT:
An optical range finder includes two detectors for minimizing frequency dispersion affects of the detectors on the system. The optical range finder is calibrated by locking a voltage controlled oscillator onto adjacent null modulation signal frequencies and determining a calibration time for each adjacent frequency. Once the calibration time is determined, the range finder transmits its modulated light signal to a target device and back. The signal reflected back is detected and a measurement time delay is calculated for each of the adjacent modulation signal frequencies. From these measurements, the actual distance between the target and the device can be calculated. The multiple frequency measurements allows for statistical averaging of random errors in the system.

REFERENCES:
patent: 3778160 (1973-12-01), Wolcott
patent: 4176954 (1979-12-01), Bouillie et al.
patent: 4413905 (1983-11-01), Holzapfel
patent: 4443107 (1989-04-01), Alexander et al.
patent: 4895441 (1990-01-01), Allen
G. M. S. Jones et al. Optics & Laser Tech., Aug., 1985, p. 169.

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