主动照明强度相干成像散斑效应仿真及实验研究  

Speckle Effect on Active Illuminated Intensity Correlation Imaging

作　　者：李冲 高昕[1] 秦星[2,3] 李希宇 陆长明[1] LI Chong;GAO Xin;QIN Xing;LI Xi-yu;LU Chang-ming(Key-Laboratory of Space Object Measurement,Beijing Institute of Tracking and Telecommunications Technology,Beijing 10094,China;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]北京跟踪与通信技术研究所空间目标测量重点实验室,北京100094 [2]中国科学院西安光学精密机械研究所,西安710119 [3]中国科学院大学,北京100049

出　　处：《光子学报》2019年第1期43-50,共8页Acta Photonica Sinica

基　　金：国家高技术研究发展计划(No.2015AAxxx5038);北京跟踪与通信技术研究所科研基金~~

摘　　要：简述了强度相干成像原理,分析了照明激光散斑效应,并仿真了散斑效应对频谱模值的影响,利用数字微镜阵列设计实验,根据自适应望远镜测得的波前数据设置数字微镜阵列翻转状态,对不同目标采集光强涨落信息,利用基于先验信息的迭代算法进行图像恢复.结果表明:目标散斑光场强度涨落服从负指数分布;散斑光场使得目标频谱模值高频部分出现误差;利用基于先验信息的迭代算法能较好地恢复目标图像,目标恢复图像峰值信噪比最高可达29.87dB.The principle of intensity correlation imaging is demonstrated in this paper.Besides,the speckle effect of illumination laser is analyzed and the influence on spectral modulus induced by speckle effect is also analyzed with the aid of simulation.The digital micromirror array is used to design the experiment.Utilizing the wavefront data measured by the adaptive optical telescope,the rotational state of digital micromirror array can be set.Hence,the information of intensity fluctuation from different targets can be obtained.Then,the image restoration can be realized using prior information iteration algorithm.The results show that the intensity fluctuation of the target speckle light field obeys the negative exponential distribution.Apart from that,the speckle light field makes the error of the high frequency part of the target spectral modulus.Using the prior information iteration algorithm can recover the target image well,and the peak signal-to-noise ratio of the target recovery image can reach up to29.87dB.

关 键 词：强度相干成像 主动照明 散斑效应 光强涨落 图像恢复 

分 类 号：O438[机械工程—光学工程] O438.2[理学—光学]