Instantaneous phase-stepping interferometry using polarization imaging with a micro-retarder array
Instantaneous phase-stepping interferometry using polarization imaging with a micro-retarder array
复制标题
使用带有微延迟器阵列的偏振成像的瞬时相位步进干涉测量
DOI：
10.1007/bf02427994
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发表时间：
2005
影响因子：
2.4
通讯作者：
K. Moriwaki
中科院分区：
文献类型：
--
作者：
S. Yoneyama;H. Kikuta;K. Moriwaki
本文提出了一种利用带形双折射微延迟器阵列的CCD相机进行瞬时相位步进和相位分析的干涉测量方法。利用双偏振片的Twyman-Green干涉仪建立了一套偏振干涉测量系统，用于分析离面位移的分布。使用在CCD平面上具有微延迟器阵列的CCD相机记录从干涉仪出现的光。该微延迟器阵列具有四个不同的主方向。也就是说，由CCD照相机获得的图像包含对应于延迟器的四个不同光轴的四种类型的数据。从CCD摄像机记录的图像中分离出的四幅图像采用灰度插值法重建。然后，从四个图像计算表示偏振状态的斯托克斯参数的分布。由这些斯托克斯参数得到了由泰曼-格林干涉仪产生的干涉条纹图的相位分布。这种方法适用于时间相关的现象，因为在完成相位分析时，多次曝光对于充分的数据采集是不必要的。
An instantaneous phase-stepping and subsequent phase analysis method, using a CCD camera with a form-birefringent micro-retarder array, is proposed for interferometry. An optical setup of a polarization interferometry using a Twyman-Green interferometer with two polarizers is constructed to analyze the distribution of out-of-plane displacement. Light emerging from the interferometer is recorded using a CCD camera that has micro-retarder array on the CCD plane. This micro-retarder array has four different principal directions. That is, an image obtained by the CCD camera contains four types of data corresponding to four different optical axes of the retarder. The four images separated from the image recorded by the CCD camera are reconstructed using gray-level interpolation. Then, the distributions of the Stokes parameters that represent the state of polarization are calculated from the four images. The phase distribution of the interference fringe pattern produced by the Twyman-Green interferometer is then obtained from these Stokes parameters. This method is applicable to time-dependent phenomena because multiple exposures are unnecessary for sufficient data acquisition in the completion of phase analysis.