光纤干涉成像阵列全息相位校正研究

针对光纤传输和干涉成像阵列中的相位误差, 提出了一种基于特殊光子晶体的全息相位校正方法。首先分析了光纤干涉阵列成像的基本原理和相位信息的传输过程, 以一维线性阵列建立成像系统相位误差模型, 通过对参考光束和探测器前的快门交替打开和闭合, 来分别实现在晶体上写入由光纤阵列的出射光束与参考光束干涉形成的含有相位误差的光栅函数, 和光纤中出射光束被该光栅衍射和相位偏移以消除相位误差, 从理论上分析了上述基于光子晶体的全息法相位校正原理。最后采用所建立的含有相位误差的干涉阵列进行成像仿真, 对未加校正、采用本文方法和采用冗余基线校正的结果进行了对比分析。

Holographic Phase Calibration for Fiber Interferometric Imaging Array

A new approach based on holographic technique was proposed with photorefractive crystal for phase error calibration in fiber interferometric imaging arrays. The principle of fiber interferometric imaging arrays and the transmission of phase information were discussed first. The model of phase error was set up for a one dimension linear array system. The particular process of holographic phase calibration with photorefractive crystal was as follows: the shutter before the reference beam and the shutter before the CCD camera were kept on and off by turns, which respectively made for the diffractive grating writing formed by interfering of fiber beam and reference beam, and for the diffraction and phase shift of the fiber beam. Finally the imaging simulation using un-calibrated, the purposed approach and the redundant baseline spacing calibration corresponded was compared based on the 1D fiber interferometric array with phase errors.