为进一步缩小光学相关器体积,设计了一种折反式2f系统光学相关器,光路采用折叠反射式结构,用数字微透镜取代传统相关器中的实体透镜,缩减了结构体积,提升了系统集成度。利用等效光路法对其进行理论分析,给出了折反式2f相关器的结构设计条件及结构参数。针对该相关器,设计了与之匹配的综合鉴别函数滤波器,利用自编程序进行模拟仿真分析。结果显示,当待识别目标发生缩放与旋转畸变时, 该相关器仍具有较好的畸变不变识别性能。

In order to further reduce the volume of optical correlator, an optical correlator for folding reflective 2f system is designed. The optical path adopts folding reflective structure. Digital micro lens replaces physical lens in the traditional correlator to reduce the volume of the structure and improve the system integration. The structural design conditions and structural parameters of the folding reflective 2f correlator are given theoretically based on equivalent optical path method. The optimal trade-off share duplexed filter (SDF) is designed for the correlator, and the simulation analysis is performed by a self-compiled program. Simulation results indicate that the correlator still has good distortion invariant recognition performance when the target is subject to scaling and rotation distortion.