光子学报, 2019, 48 (1): 0111004, 网络出版: 2019-01-27
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
强度相干成像 主动照明 散斑效应 光强涨落 图像恢复 Intensity correlation imaging Active illumination Speckle effect Intensity fluctuation Image recovery
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29.87 dB.
Abstract
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 to 29.87 dB.
李冲, 高昕, 秦星, 李希宇, 陆长明. 主动照明强度相干成像散斑效应仿真及实验研究[J]. 光子学报, 2019, 48(1): 0111004. LI Chong, GAO Xin, QIN Xing, LI Xi-yu, LU Chang-ming. Speckle Effect on Active Illuminated Intensity Correlation Imaging[J]. ACTA PHOTONICA SINICA, 2019, 48(1): 0111004.