Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1982-09-28
1985-08-06
Buczinski, S. C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
343 13R, G01C 308
Patent
active
045332428
ABSTRACT:
A system is described for measuring the distance to an object by comparing a first component (18) of a light pulse that is reflected off the object (14), with a second component (20) of the light pulse that passes along a reference path (26) of known length, which provides great accuracy with a relatively simple and rugged design. The reference path (26) can be changed in precise steps so that is has an equivalent length approximately equal to the path length of the light pulse component that is reflected from the object. The resulting small difference in path lengths can be precisely determined by directing the light pulse components into opposite ends of a detector (70) formed of a material that emits a second harmonic light output at the locations where the opposite-going pulses pass simultaneously across one another.
REFERENCES:
patent: 2968987 (1961-01-01), Knopow
patent: 3019690 (1962-02-01), Hildebrand et al.
patent: 3914052 (1975-10-01), Wiklund
patent: 4451146 (1984-05-01), Grage et al.
AuYeung John
Goss Willis C.
McLauchlan John M.
Psaltis Demetri
Tubbs Eldred F.
Buczinski S. C.
Jones Thomas H.
Manning John R.
McCaul Paul F.
The United States of America as represented by the Administrator
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