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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 6 — Feb. 20, 2001
  • pp: 969–973

Single-particle laser Doppler anemometry at 1.55 µm

Michael Harris, Guy N. Pearson, Kevin D. Ridley, Christer J. Karlsson, Fredrik Å. A. Olsson, and Dietmar Letalick  »View Author Affiliations


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

OCIS Codes
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(280.3400) Remote sensing and sensors : Laser range finder

History
Original Manuscript: May 11, 2000
Revised Manuscript: October 1, 2000
Published: February 20, 2001

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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