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首页> 外文期刊>Optical engineering >Scintillation index measurement using time-correlated single-photon counting laser radar
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Scintillation index measurement using time-correlated single-photon counting laser radar

机译：使用时间相关的单光子计数激光雷达测量闪烁指数

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摘要

The scintillation index is a common measure of the effects of atmospheric turbulence. Using a photon-counting sensor, the integration time for each sample needs to be short enough to ensure that the intensity is constant during this time. Simultaneously, hardware limitations, including detector dead-time, restrict the count rate so that the number of counts in a single time segment is extremely low. The dead-time also introduces nonlinear effects. The variance calculation in the scintillation index formula is then dominated by quantization error, and the scintillation index is severely overestimated. We investigate two methods of correcting the scintillation index based on data from a time-correlated single-photon counting laser radar system. The first approach is based on the covariance calculation of the data and can be used for very low count rates and high temporal resolution. This method may also be useful in other cases where the variance of noisy, time-resolved data needs to be calculated. The second method is based on fitting the theoretical probability density function for the intensity fluctuation caused by propagation through turbulence to the experimental data. This method can take dead-time effects into account and be used for hiaher count rates.
机译：闪烁指数是衡量大气湍流影响的常用指标。使用光子计数传感器，每个样品的积分时间需要足够短，以确保在此期间强度恒定。同时，包括检测器死区时间在内的硬件限制也限制了计数率，因此单个时间段中的计数数量极低。停滞时间还会引入非线性效应。然后，闪烁指数公式中的方差计算受量化误差的支配，并且闪烁指数被严重高估。我们研究了两种基于时间相关的单光子计数激光雷达系统的数据来校正闪烁指数的方法。第一种方法基于数​​据的协方差计算，可用于极低的计数率和高时间分辨率。在需要计算嘈杂的时间分辨数据的方差的其他情况下，此方法也可能有用。第二种方法基于将理论概率密度函数拟合为由湍流传播引起的强度波动的实验数据。此方法可以考虑死区时间影响，并可以用于更高的计数率。

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