基于成像变换测量矩阵的太赫兹关联成像  

Terahertz Ghost Imaging Based on Imaging-Transformation Measurement Matrices

作　　者：严海月 赵成强[1] 徐文东[1] 李硕丰 Yan Haiyue;Zhao Chengqiang;Xu Wendong;Li Shuofeng(State Key Laboratory of High Field Laser Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海光学精密机械研究所强场激光物理国家重点实验室,上海201800 [2]中国科学院大学材料与光电研究中心,北京100049

出　　处：《中国激光》2019年第12期280-288,共9页Chinese Journal of Lasers

基　　金：国家自然科学基金(61501435)

摘　　要：提出一种新的测量矩阵获取方式--成像变换法,利用可见光相机拍摄调幅板花纹信息,采用相干成像算法获得模拟光场,最终将其转变为关联成像测量矩阵。通过搭建的太赫兹关联成像装置验证了成像变换法的可行性。实验结果表明,采用成像变换法得到的测量矩阵可使太赫兹关联成像达到系统的衍射极限分辨率,成像质量明显优于传统扫描方式获取的测量矩阵。同时实验研究了采样次数、光瞳函数、矩阵分辨率等因素对最终成像质量的影响。Herein, a new imaging-transformation method for acquiring a measurement matrix is proposed. A visible light camera is used to capture amplitude-modulated plate pattern information, then a coherent imaging algorithm is used to obtain the simulated light field, and finally the simulated light field is transformed into a ghost imaging measurement matrix. We validate the feasibility of this imaging-transformation method using an established terahertz ghost imaging system. Experimental results show that the measurement matrix obtained using the proposed method can enable terahertz ghost imaging to reach diffraction limit resolution. The resulting image quality is superior to that obtained using the classical scanning method. In addition, we experimentally study the influences of sampling frequency, pupil function, and matrix resolution on the final image quality.

关 键 词：成像系统 太赫兹成像 测量矩阵 关联成像 压缩感知算法 

分 类 号：O436[机械工程—光学工程]