空间光调制器实现随机相位模板的仿真分析  

Simulation analysis of random phase mask with spatial light modulator

作　　者：林超[1] 沈学举[1] 杨胜翔[1] 

机构地区：[1]军械工程学院光学与电子工程系,石家庄050003

出　　处：《激光技术》2013年第3期365-370,共6页Laser Technology

摘　　要：为了构建基于空间光调制器的实时光学加密系统,采用仿真实验的方式,分析了在双随机相位光学加密系统中使用空间光调制器实现随机相位编码时相位编码参量对加密效果的影响。重点研究了随机相位模板中独立相位调制点的个数及相位调制范围对加密图像质量的影响,并引入相关系数来衡量加密图像和原始图像的差异。结果表明,在设定相关系数阈值为0.1的条件下,独立相位调制点个数达到128×128,相位调制范围达到2π时,加密效果较好。该结果对设计实时光电加密系统有一定指导意义。To construct a real-time optical encryption system with spatial light modulator, the parameters of phase modulation were analyzed when utilizing spatial light modulator as phase modulators in the double random phase encoding system by means of simulation method. The influence of two important parameters, i. e. , the phase modulation range and the independent point numbers of phase modulation on the encryption quality was investigated extensively. A correlation coefficient was introduced to evaluate the difference between the original image and encrypted image. The simulation results indicate that a satisfying encrypted image can be obtained when the independent point numbers of phase modulation is approaching to 128x 128 and the phase modulation range is set to 2nassuming that the correlation coefficient is 0. 1. The results are significant for the design of real-time optical encryption system with spatial light modulator.

关 键 词：信息光学 加密效果 仿真分析 空间光调制器 双随机相位加密 

分 类 号：O438[机械工程—光学工程]