光学波前的有效相干长度估计
Effective coherence length estimation of optical wavefronts
摘要：
在自适应光学中，空间相干长度的测量有助于确定夏克哈特曼传感器（SHS）的最佳设计参数。本文提出了两种估计光波前空间相干长度的方法。第一种方法是基于对波前中霍夫峰的数量进行计数。第二种方法是基于一个简单的数据挖掘技术应用于波前。不同性质的光学波前进行了模拟，并用于统计分析。使用蒙特卡罗模拟的两种方法的性能进行了比较。结果表明，这两种方法可以成为有效的工具，在估计的有效相干长度的光波前。
英文摘要：
In adaptive optics, the measurement of spatial coherence length helps in deciding the optimum design parameters of a Shack Hartmann Sensor (SHS). Two methods of estimating the spatial coherence length of optical wavefronts are presented. The first method is based on counting the number of Hough peaks in the wavefront. The second method is based on a simple data mining technique applied on the wavefronts. Optical wavefronts with different properties are simulated and used for statistical analysis. A comparison of the performance of the two methods is presented using Monte Carlo simulations. It is shown that both these methods can become efficient tools in estimating the effective coherence length of optical wavefronts.
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