Atmospheric Turbulence Effects on the Temporal Spectral Densities of Optical Signals.
Final rept. 1 Jun 75-31 May 79,
TEXAS UNIV AT EL PASO SCHELLENGER RESEARCH LABS
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This summary report describes the major efforts and results obtained during the contract period. The objectives were to extend the applicability of optical methods of crosswind sensing to obtain operation under strong turbulence conditions, and to investigate the effects of motion on the optical speed measurement. Two optical windspeed instruments designed to be unaffected by strong turbulence were built and tested. One design was based on the measurement on the time delay required to obtain a peak in the crosscorrelation function derived from intensity fluctuations, and the second design was based on fluctuations of the beam angle of arrival. Both instruments were tested over 2 km paths and the operation was unaffected by increasing turbulent strength. An instrument, using an optical beam and spatial filters at the transmitter and receiver, was built to demonstrate the feasibility of the technique to profile corsspath windspeeds along the beam. The device was tested to path lengths of 500 m and operated satisfactorily. A study was conducted on the errors produced in an optical wind speed measurement due to motion of the receiver andor beam source. Author
- Atmospheric Physics