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
查看参考文献12篇
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文摘
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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. |
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其他语种文摘
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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. |
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来源
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光学学报
,2009,29(2):303-307 【核心库】
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DOI
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10.3788/aos20092902.0303
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关键词
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湍流大气
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Shack-Hartmann波前传感器
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闪烁相关
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路径横向平均风速
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地址
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中国科学院安徽光学精密机械研究所,大气光学中心, 安徽, 合肥, 230031
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0253-2239 |
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学科
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大气科学(气象学) |
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基金
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中国科学院创新基金
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文献收藏号
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CSCD:3584638
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