Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1974-05-09
1976-06-15
Wilbur, Maynard R.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 4, 350 1, 331 945C, 331 945D, 331 945E, 331 945P, 252300, G01C 308
Patent
active
039633470
ABSTRACT:
A laser rangefinder for clouds, fog, haze and precipitation including an erbium doped laser transmitter, a germanium photodiode monitor and a germanium avalanche photodiode detector. The germanium avalanche photodiode and an amplifier module is positioned at the focus of a parabolic reflector. The transmitter transmits light in a waveband with an optical center at 1.54 microns and is eye safe. A periscope system aligns the outgoing pulse with the returning light to reduce parallax.
To reduce alignment problems when shifts in wavelengths occur, an optical circuit with only reflecting surfaces can be employed.
To increase the efficiency of the laser transmitter, the clamps utilized to position the laser rod within the cavity are formed of the same material as the laser rod and the pump light reflector is a second surface mirror with a quartz substrate coated in succession with silver, copper and black paint.
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patent: 2103538 (1937-12-01), Kolb
patent: 3146120 (1964-08-01), Upton et al.
patent: 3339150 (1967-08-01), Bowness
patent: 3471800 (1969-10-01), Congleton et al.
patent: 3518570 (1970-06-01), Dittrich
patent: 3556657 (1971-01-01), Quelle, Jr.
patent: 3781552 (1973-12-01), Kadrmas
patent: 3782824 (1974-01-01), Stoliar et al.
NASA Tech Brief 68-10311, 8-1968.
Segre et al., 1973 IEEE/OSA Conf. on Laser Eng. & Appl., pp. 55-56, 5-1973.
Segre Joseph Pipo
Truscott Norman R.
American Optical Corporation
Berkenstock, Jr. H. R.
Buczinski S. C.
Nealon William C.
Wilbur Maynard R.
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