Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1993-01-22
1994-08-09
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356 5, 250226, G01C 308
Patent
active
053369009
ABSTRACT:
A laser rangefinder apparatus is provided which includes a laser transmitter for transmitting a coherent light pulse exhibiting one of two different wavelengths over an optical path to a target. The particular wavelength of the laser light pulse is selectable by the user between two different wavelengths. The transmitted light pulse is reflected from the target as a reflected pulse and travels back to the laser rangefinder over the same optical path. The reflected light pulse is provided to a laser receiver including a fiber optic interface which supplies the pulse to a fiber optic interface cable. The fiber optic interface cable supplies the reflected pulse to a wideband photodetector to form a single channel capable of sensing each of the two wavelengths. The single channel configuration of the rangefinder dramatically reduces the parts count of the rangefinder as compared with prior rangefinders. The rangefinder includes a range processing unit which performs the distance to target calculation and displays the resultant distance to the user. The fiber optic interface permits great flexibility in the placement of the laser receiver with respect to the laser transmitter of the rangefinder.
REFERENCES:
patent: 4367552 (1983-01-01), Jacobson
patent: 4851661 (1989-07-01), Everett, Jr.
patent: 4904043 (1990-02-01), Schweizer
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patent: 4998012 (1991-03-01), Kruse
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patent: 5206697 (1993-04-01), Schwartz
Croteau Michael G.
Peters Rodney E.
Hobby III William M.
Lee John R.
Litton Systems Inc.
Nelms David C.
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