Simultaneous observation of phase-stepped photoelastic fringes using a pixelated microretarder array
Simultaneous observation of phase-stepped photoelastic fringes using a pixelated microretarder array
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DOI：
10.1117/1.2335894
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发表时间：
2006-08
影响因子：
1.3
通讯作者：
S. Yoneyama;H. Kikuta;K. Moriwaki
中科院分区：
文献类型：
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作者：
S. Yoneyama;H. Kikuta;K. Moriwaki
提出了一种基于像素化双折射微缓速器阵列的电荷耦合器件（CCD）相机进行二维双折射分布测量的瞬时相位步进及后续相位分析方法。用该方法对放置在偏振片和四分之一波片后面的双折射样品进行了分析。从样品中发出的光使用CCD相机记录，该相机在CCD平面上具有像素化微延迟器阵列。微缓速器阵列有四个不同的主方向。即CCD相机获得的一幅图像包含四个数据，对应于缓速器的四个不同光轴。利用灰度插值法对CCD相机记录的图像分离出的四幅图像进行重构。然后，计算了代表偏振状态的Stokes参数的分布。然后由Stokes参数得到双折射参数，即主轴角和相位延迟。该方法适用于光学元件的实时检测以及时变材料的力学研究，因为在完成数据分析时，不需要多次曝光来获取足够的数据。
An instantaneous phase stepping and subsequent phase analysis method, using a charge-coupled device (CCD) camera with a pixelated form-birefringent microretarder array, is proposed for 2-D birefringence distribution measurement. A birefringent sample placed behind a polarizer and a quarter-wave plate is analyzed by the proposed method. Light emerging from the sample is recorded using a CCD camera that has a pixelated microretarder array on the CCD plane. This microretarder array has four different principal directions. That is, an image obtained by the CCD camera contains four 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 birefringence parameters, that is, the angle of the principal axis and the phase retardation, are then obtained from these Stokes parameters. This method is applicable to real-time inspection of optical elements as well as the study of the mechanics of time-dependent materials, because multiple exposures are unnecessary for sufficient data acquisition in the completion of data analysis.