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Single-particle laser Doppler anemometry at 1.55 μm

机译：1.55μm的单粒子激光多普勒风速仪

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摘要

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.
机译：我们演示了波长为1.55μm的连续激光多普勒风传感器的成功运行。在更长的范围内（> 100 m），该信号与复杂的高斯统计非常吻合，这与大量散射气溶胶贡献的不相干性相符。随着范围的减小，探头的体积会迅速减小，并且信号统计数据也会发生巨大的变化。在最短距离（<8 m）处，信号由短脉冲为主，每个短脉冲源自测量空间内的单个粒子。这些单粒子事件可能具有非常高的信噪比（SNR），因为（1）信号集中在较小的时间窗口内，并且（2）与多粒子检测相比，其带宽大大降低。给出了不同范围和各种大气反向散射条件下的风信号统计示例。结果表明，即使在约50 m的范围内，单粒子散射事件也发挥着重要作用，导致结果与复杂的高斯统计不一致。评估了利用单粒子检测获得的SNR增强的低功率激光多普勒风传感器的潜力。

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