相关器的特性变化规律对其实际应用中参数的设定具有重要的指导意义。针对基于比累对切透镜的联合菲涅耳变换相关器, 通过数值仿真详细分析了比累对切透镜缝宽变化对相关器输出特性和空变特性的影响。结果表明, 比累对切透镜缝宽能一定程度地控制联合菲涅耳变换功率分布的有效面积、相关峰的尖锐度及其空变特性的敏感度。实验采用纯相位空间光调制器编码比累对切透镜相位掩模替代实体透镜的方式搭建了相关器, 实验结果与仿真结果一致性好, 进一步验证了上述结论的正确性。

The change laws of the characteristics of correlator have an important significance for the setting of its parameters in practical applications. Aiming at the joint Fresnel transform correlator (JFTC) with adjustable structure, the influence of the split width of Billet split lens (BSL) on the output and space-variant characteristics was analyzed in detail. The results show that the split width of the BSL can control the distribution size of the joint Fresnel power, the sharpness of the correlation peak, and the sensitivity of the space-variant characteristics. In the experiment, a structure-adjustable JFTC was constructed by using a phase-only spatial light modulator, which was encoded as a BSL phase mask to instead of a real lens. The experimental results are in good agreement with the simulation results, further verifying the correctness of the above conclusions.