Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1974-10-29
1976-04-13
Wilbur, Maynard R.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
330 43, G01P 336, H01S 300
Patent
active
039501000
ABSTRACT:
A laser heterodyne system is disclosed wherein received reflections of a beam of coherent light are amplified in a laser. The amplified received reflections are heterodyned with the light produced by the laser and the resulting beat frequency is detected using a photodetector. A controller, responsive to the beat frequency, controls, in one case, the frequency of a transmitting laser, and hence the frequency of the received light, and, in another case, the frequency of the light produced by the amplifying laser so that, in either case, the difference between the frequency of the received light and the frequency of the light produced by the amplifying laser is adjusted to maximize the amplification of the received light by the amlifying laser prior to detection by the photodetector.
REFERENCES:
patent: 3482184 (1969-12-01), Schneider et al.
patent: 3573463 (1971-04-01), Goodwin et al.
patent: 3730628 (1973-05-01), Wolcott et al.
patent: 3732013 (1973-05-01), Hieslmair et al.
Harris Clarke E.
Jelalian Albert V.
Keene Wayne H.
Miller Christopher R.
Seavey Richard E.
Bartlett Milton D.
Buczinski S. C.
Pannone Joseph D.
Raytheon Company
Sharkansky Richard M.
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