Edge filter and fringe imaging for laser Doppler wind speed measurement

Jack A. McKay

doi:10.1117/12.281031

6 August 1997 Edge filter and fringe imaging for laser Doppler wind speed measurement

Jack A. McKay

Proceedings Volume 3065, Laser Radar Technology and Applications II; (1997) https://doi.org/10.1117/12.281031
Event: AeroSense '97, 1997, Orlando, FL, United States

Abstract

Optical measurement of the Doppler shift of laser backscatter, using a near-IR, visible, or ultraviolet laser, is potentially more robust and field reliable than coherent, heterodyne measurement with an IR laser. The direct measurement of the displacement of Fabry-Perot interference fringes is possible, but entails expensive, technically challenging, imaging detectors. The 'edge technique' permits Doppler shift measurements with relatively simple detectors and detector electronics, and has been implemented with Fabry-Perot etalons and with atomic line filters. Simple analytical models of the fringe imaging and edge detection techniques are presented, permitting ready calculation of the potential performance of either, for various atmospheric conditions and for various lidar hardware configurations. The predictions of the analytical models are confirmed by computer models, which in turn allow more detailed considerations of complicating factors such as solar backgrounds and the Rayleigh backscatter signal It is shown that, in virtually all cases of practical interest, for a given lidar signal level, the fringe imaging technique, implemented with either a tunable laser or with a tunable etalon, will yield substantially higher wind speed measurement precision than the edge technique. The result support cost-benefit comparisons of the two approaches to direct detection Doppler wind speed measurement.

Citation Download Citation

Jack A. McKay "Edge filter and fringe imaging for laser Doppler wind speed measurement", Proc. SPIE 3065, Laser Radar Technology and Applications II, (6 August 1997); https://doi.org/10.1117/12.281031

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