光场相机波前传感器性能分析

Performance Analysis of Light Field Wave-Front Sensor

提出了一种光场相机波前传感器的成像模拟方法，该方法将微透镜阵列等效为一个相位掩膜，考虑了微透镜之间的干涉效应。数值模拟显示，不存在波前畸变时，光场相机的波前斜率输出不为零，降低了波前重构精度；光场相机波前传感器的线性度随着微透镜尺寸的减小而提高，然而存在一个与波前畸变程度有关的最优微透镜尺寸，使波前复原精度最高；与哈特曼波前传感器相比，在国内典型大气条件下，光场相机的波前重构精度略低。

A light field wavefront sensor camera image formation solution based on modelling micro-lens array as a phase mask is proposed, which considers the interference between lenslets. Numerical simulation shows that light field wavefront sensor gradient signals are not null when the input wavefront is unaberrated, which decreases the wavefront reconstruction precision. The linearity of light field wavefront sensor improves when the size of lenslet decreases. There exists an optimal lenslet size to make the wavefront reconstruction error least. Compared with Hartmann wavefront sensor, the wavefront reconstruction precision of light field wavefront is a bit lower.