在采用散斑自相关方法,对基于辅助参考物的赝热光透过散射介质成像过程进行数值模拟的基础上,讨论了当成像范围超出一个光学记忆效应时,重建目标的质量随之变差的情况。通过对处在不同子光学系统的目标物和参考物,不断改变其点扩散函数的相关度,来近似等效它们超出光学记忆效应范围的程度,得出能够容忍的相邻光学记忆效应范围最低的点扩散函数相关度,并分析了点扩散函数的相关度对重建目标像质量的影响。随着相邻光学子系统点扩散函数的相关度逐渐降低,成像效果也逐渐变差。当这一相关度值低于0.3839时,重构图像已无法用肉眼分辨。对于同一相关度的点扩散函数,其空间分布函数并不影响成像效果的变化。同时,在相邻散斑相互叠加形成叠加散斑的过程中,叠加面积与模拟成像效果呈正比关系,即随着散斑叠加面积的减少,成像效果逐渐变差。

In order to explore the change of the reconstructed images beyond the range of the optical Memory effect, speckle-correlation imaging through scattering turbid media with the auxiliary of a known reference object was presented in this paper. The tolerated lowest range of the adjacent optical memory effects was analyzed by changing the relevancy of the point spread function of the target and reference objects in different sub-optical systems. In addition, the influence of the correlation of the point spread function on the quality of the reconstructed target image was discussed. As the correlation of point diffusion function of adjacent optical subsystem decreases gradually, the imaging effect also becomes worse gradually. When the correlation value is lower than 0.383 9, the reconstructed image can no longer be distinguished by the naked eye. For the point diffusion function of the same degree of correlation, its spatial distribution function does not affect the quality of the reconstructed target. At the same time, in the process of adjacent speckle superposition forming the superposition speckle, the superposition area is proportional to the simulated imaging effect, that is, the imaging effect becomes worse with the decrease of the superposition area of speckle.