作为强度阈值水平函数的平均散斑尺寸：实验测量与理论的比较

Average speckle size as a function of intensity threshold level: comparisonof experimental measurements with theory.

作者信息

Alexander T L, Harvey J E, Weeks A R

出版信息

Appl Opt. 1994 Dec 10;33(35):8240-50. doi: 10.1364/AO.33.008240.

DOI:10.1364/AO.33.008240

PMID:20963057

Abstract

Speckle phenomena result whenever spatially coherent radiation is reflected from a rough surface or propagated through a random medium such as atmospheric turbulence. Speckle characteristics are therefore a major concern in many laser-imaging or wave-propagation applications. We present the results of experimental measurements of target-induced speckle patterns produced in the laboratory from a variety of targets and illumination conditions. We then compare these experimental measurements with a theoretical model for the average speckle size as a function of intensity threshold level. Excellent agreement is obtained for intensity threshold levels greater than approximately twice the mean intensity level.

摘要

只要空间相干辐射从粗糙表面反射或通过诸如大气湍流等随机介质传播，就会产生散斑现象。因此，在许多激光成像或波传播应用中，散斑特性是一个主要关注点。我们展示了在实验室中由各种目标和照明条件产生的目标诱导散斑图案的实验测量结果。然后，我们将这些实验测量结果与作为强度阈值水平函数的平均散斑尺寸的理论模型进行比较。对于大于平均强度水平约两倍的强度阈值水平，获得了极好的一致性。