基于统计平均方法实现透过散射介质全息成像  

Holographic Imaging through Scattering Medium Based on Statistical Average Method

作　　者：张辉[1,2] 张在坤 孔德鹏 贺正权[1] ZHANG Hui;ZHANG Zaikun;KONG Depeng;HE Zhengquan(Xi'an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi'an 710119,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院西安光学精密机械研究所,西安710119 [2]中国科学院大学,北京100049

出　　处：《光子学报》2022年第6期307-314,共8页Acta Photonica Sinica

基　　金：国家自然科学基金(No.62071465)。

摘　　要：为了透过散射介质恢复隐藏环境中物体的信息,搭建双光束干涉全息成像系统,通过旋转毛玻璃实现散斑平均,在相机获得干涉散斑图像后,只需要对其进行傅里叶变换即可对隐藏在散射介质后的物体进行信息重建。通过引入第二个静置的散射介质扩展了该方法的应用场景。实验结果表明,毛玻璃旋转速度越快,达到最高峰值信噪比所需要的相机曝光时间越短。该方法利用统计平均和无透镜傅里叶变换数字全息,结构简单、重建速度快,且不需要相位校正和复杂的图像处理、目标扫描、波前整形等。Light is an important vehicle for observing and obtaining image information about objects and is an important way of perceiving the environment.However,in the natural environment,there are often small particles or obstacles between the observer and the observed object that prevent direct imaging of the observed object.When there is a scattering medium in the imaging optical path,photons are scattered with the scattering medium and the incident wavefront of the light is destroyed,resulting in a change in the direction of light propagation,and the photoelectric imaging system does not work properly under these conditions.To solve the problem of not being able to image the observed object clearly in the presence of the scattering medium,in this paper,statistical averaging and lensless Fourier transform digital holography are used to achieve imaging through the scattering medium.The speckle is averaged through the rotating scattering medium,and the exposure time of the camera is increased so that the time average of the scattering field replaces the collective average,thus eliminating the effect of the random phase introduced by the scattering medium on the imaging process.This method of digital holography using statistical averaging and lensless Fourier transform has the advantages of simple and compact optical path structure,fast reconstruction speed,and low cost.Compared to wavefront shaping technology,transmission matrix technology,adaptive optics technology,and other methods of imaging through scattering media,this method does not require phase correction and complex image processing,target scanning,wavefront shaping,and other complicated operations.The experiments firstly investigate the effects of ground glass rotation speed and CCD exposure time on the peak signal-to-noise ratio of reconstructed images.The experiments show that different rotation speeds require different exposure times to achieve the highest peak signal-to-noise ratio,and the faster the rotation speed,the shorter the time required to reach th

关 键 词：散射介质成像 数字全息 统计平均 毛玻璃 峰值信噪比 

分 类 号：O438[机械工程—光学工程]