光源空间相干性对透过散射层成像的影响

Effect of Spatial Coherence of Light Source on Imaging Through Scattering Layer

散射介质成像是光学成像领域的一个重大挑战,其中照明光源的相干度起着重要作用.研究了光源空间相干性对通过散射层的散斑成像的影响,将激光聚焦到旋转毛玻璃上,通过改变焦点到旋转毛玻璃的距离来控制部分空间相干光的相干度.结果表明,光源空间相干性越低,采用迭代相位恢复算法和基于点扩展函数的反卷积方法重建物体的图像质量就越高.因此,要通过散射层进行高质量的散斑成像,必须选择空间相干性恰当的光源.

Scattering medium imaging is a major challenge in the field of optical imaging,in which the coherence of illumination source plays an important role.In this paper,the influence of the spatial coherence of the light source on the speckle imaging through the scattering layer is studied.The laser is focused on the rotating ground glass,and the coherence of partial spatial coherent light is controlled by changing the distance from the focus to the rotating ground glass.The results show that the lower the spatial coherence of the light source,the higher the quality of the reconstructed object using the iterative phase recovery algorithm and the deconvolution method based on the point spread function.Therefore,in order to carry out high-quality speckle imaging through the scattering layer,the light source with appropriate spatial coherence must be selected.