Digitally whole-field analysis of isoclinic parameter in photoelasticity by four-step color phase-shifting technique
Digitally whole-field analysis of isoclinic parameter in photoelasticity by four-step color phase-shifting technique
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DOI：
10.1016/j.optlaseng.2006.12.005
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发表时间：
2007-07
影响因子：
4.6
通讯作者：
P. Pinit;E. Umezaki
中科院分区：
文献类型：
--
作者：
P. Pinit;E. Umezaki
本文提出了一种自动测定光弹性等倾参数φ的全场方法。该方法基于四步彩色相移法和一种基于简单逻辑运算、二值图像和灰度掩模的新的去包裹方法，确定了真实相位区间（-π/2<φ π +π/2）内的φ。用一个带有白色光源的平面偏光镜获取原始光弹条纹图像。该方法的理论验证与压缩下的圆盘的问题。理论和实验结果之间的比较也被证明。用具有各向同性点和/或奇异点的光弹性模型对所提出的方法进行了实验验证。结果表明，该方法可以在真实的相位区间内确定可靠的等倾线参数，而等色线参数几乎没有缺陷。
This paper presents a whole-field method for automatic determination of the isoclinic parameter φ in photoelasticity. The method determines φ in the true phase interval (-π/2<φ⩽+π/2) based on the four-step color phase-shifting approach and a new unwrapping method based on simple logic operations, a binary image and a gray-scale mask. A plane polariscope with a white light source is used for capturing raw photoelastic fringe images. The theoretical validation of the method is done with the problem of a circular disk under compression. Comparisons between theoretical and experimental results are also demonstrated. The experimental confirmation for the proposed method is tested with the photoelastic model having an isotropic point(s) and/or a singular point(s). The results show the method permits the reliable isoclinic parameter to be determined in the true phase interval with almost no defects of the isochromatic parameter.