Extraction of phase profile at discrete spatial frequency bands using phase shifting interferometry
Extraction of phase profile at discrete spatial frequency bands using phase shifting interferometry
复制标题
使用相移干涉测量法提取离散空间频带的相位轮廓
DOI：
10.1117/12.2529344
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
K. Bhattacharya
中科院分区：
文献类型：
--
作者：
Payel Ghosh;S. S. Bhakat;Ipsita Chakraborty;S. Sarkar;K. Bhattacharya
在这篇文章中，我们报告了一种干涉方法，以提取在所需的空间频率段内可用的相位信息。将相位样本放置在会聚光束进入马赫-曾德尔干涉仪的路径中，使得两个傅里叶变换(FT)平面位于两个干涉仪臂中。FT平面中的一个被合适的掩模过滤，以便只有被阻挡的频率出现在最终干涉图中。成像透镜将位相物体成像在ccd上。结合了偏振相移，以便从四个相移干涉图重建最终的频率滤波图像。干涉仪工作在零条纹条件下，消除了残余相位。给出了仿真和实验结果。
In this paper, we report an interferometric method to extract the phase information available in a desired band of spatial frequencies. The phase sample is placed in the path of a converging beam of light entering a Mach Zehnder interferometer so that the two Fourier Transform (FT) planes are located in the two interferometer arms. One of the FT planes is filtered by suitable masks so that only the frequencies that are blocked appears in the final interferogram. An imaging lens images the phase object on a CCD. Polarization Phase Shifting is incorporated so that the final frequency filtered image is reconstructed from the four phase shifted interferograms. The interferometer is made to operate in null fringe condition so that residual phase is eliminated. Simulated and experimental results are presented.