A Ground Based CO2 Laser Doppler Velocimeter Employing An Offset Local Oscillator

S R Guy; RW. A. Coveney

doi:10.1117/12.938672

6 October 1986 A Ground Based CO2 Laser Doppler Velocimeter Employing An Offset Local Oscillator

S R Guy, RW. A. Coveney

Proceedings Volume 0663, Laser Radar Technology and Applications I; (1986) https://doi.org/10.1117/12.938672
Event: 1986 Quebec Symposium, 1986, Quebec City, Canada

Abstract

GEC Avionics have supplied a number of long range CO2 Laser Doppler Velocimeter (LDV) systems for specific research applications. This paper describes an experimental laboratory based Laser Doppler Velocimeter system, which has been constructed as part of a programme of work aimed at reducing the size and cost of ground based LDVs. The system incorporates an acousto-optic Bragg cell to provide an offset local oscillator, which enables target speed and direction to be resolved. An RF waveguide CO2 laser is e,Liployed to provide both the transmitter and local oscillator beams. The system has been used to measure the instantaneous velocity of spinning wheel targets and laboratory generated aerosol. Some examples of the processed returns from a spinning wheel target are presented.

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S R Guy and RW. A. Coveney "A Ground Based CO2 Laser Doppler Velocimeter Employing An Offset Local Oscillator", Proc. SPIE 0663, Laser Radar Technology and Applications I, (6 October 1986); https://doi.org/10.1117/12.938672

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