【作者】 丁剑平； 曾新； 梁佩莹； 陈志一；

【Author】 DING Jianping1+, ZENG Xin1, LIANG Peiying1, CHEN Zhiyi2 (1Department of Physics, Nanjing University, Nanjing 210093) (2 The 14th Institute, Ministry of Information Industry, Nanjing 210013)

【机构】 南京大学物理系； 信息产业部电子14所；

【摘要】 提要:对横向剪切干涉测量中获得的差分波前,本文提出了一种新的二维波前重建理论。通过傅里叶变换计算出待测的原始波前在x和y方向的一维估计分布,然后利用误差计算的最小二乘法,求出各行和各列的基础位相值,可以恢复出待测的二维波前分布。我们提出的理论可以应用于剪切量大于1个采样间隔的二维波前重建问题,解决了已有的二维剪切干涉波前重建技术中要求剪切量等于采样间隔的限制。研究了剪切量的大小对重建精度的影响,给出了数值实验结果和分析讨论。更多还原

【Abstract】 We propose a new technique to reconstruct two-dimensional wavefrontfrom two difference wavefront that are measured in shearing interferometers. Firstly,two one-dimensional wavefront estimates are computed using Fourier transform. Thetwo-dimensional wavefront distribution is then derived by use of least-square fitting.The proposed method is applicable to cases in which the shear amount is larger thanone sampling interval, and can alleviate the limitation on the shear amount imposedby conventional algorithm. We also investigate the influence of shear amount inreconstruction accuracy. The numeric simulations confirming the method arepresented, and analysis and discussion are also given.更多还原