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Measurement of spatial coherence through the shadow of small obscurations

机译:通过小遮盖物的阴影测量空间连贯性

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We present a simple method to measure the spatial coherence of a partially coherent field by analyzing far-field measurements with and without a well-characterized obscuration. From these measurements, the coherence can be estimated for all pairs of points whose centroid is the obstacle's centroid. By scanning the obstacle over the test plane, one can recover the four-dimensional coherence function. In principle, such measurements can be performed without any refractive or diffractive elements, allowing them to be done in higher frequency regimes.
机译:我们提出了一种简单的方法,可以通过分析带有和不带有特征鲜明的遮挡的远场测量来测量部分相干场的空间相干性。根据这些测量,可以估计所有重心为障碍物重心的点对的相干性。通过在测试平面上扫描障碍物,可以恢复四维相干函数。原则上,可以在没有任何折射或衍射元件的情况下执行此类测量,从而可以在更高的频率范围内进行测量。

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