Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1991-03-29
1992-12-08
Hellner, Mark
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
356 28, G01P 336
Patent
active
051702185
ABSTRACT:
A laser radar system for measuring wind velocities including apparatus for permitting the system to measure the direction of the atmospheric flow field. A modulator is used to chirp the laser frequency toward increasing frequencies. The local oscillator frequency available for homodyning will be offset from the initial transmitted frequency by an amount equal to the chirp rate multiplied by the round trip transit time to the aerosols at the focal point of the converging laser beam. During the up-ramped chirps of the optical beam frequency, the Doppler shift frequency of aerosols moving toward the laser beam will be translated to a lower frequency, and the Doppler shift frequency of aerosols moving away from the laser beam will be frequency translated upward.
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Dawson Walter F.
Hellner Mark
Maginniss Christopher L.
Raytheon Company
Sharkansky Richard M.
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