Single-Particle Laser Doppler Anemometry at 1.55 μm
Applied Optics, Vol. 40, Issue 6, pp. 969-973 (2001)
http://dx.doi.org/10.1364/AO.40.000969
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Abstract
We demonstrate the successful operation of a cw laser Doppler wind sensor at a wavelength of 1.55 μm. At longer ranges (>100 m) the signal conforms closely to complex Gaussian statistics, consistent with the incoherent addition of contributions from a large number of scattering aerosols. As the range is reduced, the probe volume rapidly diminishes and the signal statistics are dramatically modified. At the shortest ranges (<8 m) the signal becomes dominated by short bursts, each originating from a single particle within the measurement volume. These single-particle events can have a very high signal-to-noise ratio (SNR) because (1) the signal becomes concentrated within a small time window and (2) its bandwidth is much reduced compared with multiparticle detection. Examples of wind-signal statistics at different ranges and for a variety of atmospheric backscatter conditions are presented. Results show that single-particle-scattering events play a significant role even to ranges of ~50 m, leading to results inconsistent with complex Gaussian statistics. The potential is assessed for a low-power laser Doppler wind sensor that exploits the SNR enhancement obtained with single-particle detection.
© 2001 Optical Society of America
[Optical Society of America ]
OCIS Codes
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(280.3400) Remote sensing and sensors : Laser range finder
Citation
Michael Harris, Guy N. Pearson, Kevin D. Ridley, Christer J. Karlsson, Fredrik Å. A. Olsson, and Dietmar Letalick, "Single-Particle Laser Doppler Anemometry at 1.55 μm," Appl. Opt. 40, 969-973 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-6-969
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