光场相机波前传感器是一种新型的波前传感器,具有视场大、动态范围大的优势,但由于存在信号饱和现象,光场相机的线性度和波前传感精度较低。利用动态调制提高光场相机的线性度和波前传感精度,理论分析了光场相机波前传感的原理与特性,利用MATLAB软件对光场相机在动态调制时的波前闭环校正效果进行数值模拟,并与无调制光场相机的模拟结果进行对比分析。仿真结果表明:光场相机在动态调制时的测量精度高,校正效果较好,校正后远场光斑的斯特列尔比大于0.8,波前传感性能优于无调制光场相机。

Plenoptic camera is a new type of wavefront sensor with large dynamic range and large field of view. However, the linearity of the plenoptic camera and the accuracy of wavefront sensing are low because of the phenomenon of signal saturation,which can be improved by dynamic modulation. The principle and characteristics of plenoptic camera wavefront sensing are analyzed via numerical simulation. The wavefront closed-loop correction effect in dynamic modulation of plenoptic camera is simulated by MATLAB software, and the simulation results of dynamic modulation with plenoptic camera and without plenoptic camera are compared. Simulation results show that, under the dynamic modulation of plenoptic camera, the measurement accuracy is high, the correction effect is good, the strehl ratio of the corrected far-field spot is higher than 0.8, and the performance of the wavefront sensor is better than that of the plenoptic camera without dynamic modulation.