光学学报, 2009, 29 (2): 303, 网络出版: 2009-02-23
Shack-Hartmann传感器用于湍流大气横向风速的测量
Measurement of Path-Averaged Transverse Wind Speed with a Shack-Hartmann Wave-Front Sensor
湍流大气 Shack-Hartmann波前传感器 闪烁相关 路径横向平均风速 atmospheric turbulence Shack-Hartmann wave-front sensor scintillation correlation path-averaged transverse wind speed.
摘要
分析了利用Shack-Hartmann波前传感器子孔径对之间光强信号的时间延迟交叉相关函数, 进行光传播路径上横向平均风速测量的基本原理, 给出了横向平均风速的计算公式, 并进行了水平1 km湍流大气实验测量。实验结果如下: 不同子孔径对同时测量的横向风速相关系数达0.988; 将多对子孔径对测量的结果取平均, 与接收端附近布置的风速计测量的横向风进行了对比, 发现两系统的测量结果在随时间的变化趋势上具有较好的一致性, 两次实验拟合的相关系数分别为0.848和0.820, 标准偏差分别为0.372和0.376。以上结果表明, 将Shack-Hartmann波前传感器用于横向平均风速的测量是可行的, 拓展了该传感器的使用功能。
Abstract
By measuring time lagged cross correlation function with a pair of sub-apertures of Shack-Hartmann wave-front sensor, the path-averaged transverse wind speed and wind direction can be found directly from the slope of this function with no time delay. Experiential formula to calculate the path-averaged wind speed is deduced. And the experiment on it in 1000 m horizontal propagating path was carried out for the first time by use of a Shack–Hartmann wave-front sensor. Some results were found. Firstly, the correlation coefficients of wind speed reach 0.988 from different pairs of sub-apertures; secondly, the results from different pairs of sub-apertures were averaged, and the variation trend was in accord with gained from an anemometer placed in the 15-m tower. The correlation coefficients of two typical experiments are 0.848 and 0.820 respectively. All the experimental results indicate that measuring path-averaged transverse wind speed by Shack-Hartmann wave-front sensor is feasible, which extends the function of this sensor.
苑克娥, 朱文越, 黄印博, 饶瑞中. Shack-Hartmann传感器用于湍流大气横向风速的测量[J]. 光学学报, 2009, 29(2): 303. Yuan Ke′e, Zhu Wenyue, Huang Yinbo, Rao Ruizhong. Measurement of Path-Averaged Transverse Wind Speed with a Shack-Hartmann Wave-Front Sensor[J]. Acta Optica Sinica, 2009, 29(2): 303.