High precision deformation measurement by digital phase shifting holographic interferometry.
High precision deformation measurement by digital phase shifting holographic interferometry.
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DOI：
10.1364/ao.24.003780
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发表时间：
1985-11
期刊：
影响因子：
1.9
通讯作者：
M. Chang;C. P. Hu;P. Lam;J. Wyant
中科院分区：
文献类型：
--
作者：
M. Chang;C. P. Hu;P. Lam;J. Wyant
提出了一种能定量测定全息位移干涉条纹相位的数字相移技术。该技术使用计算机控制来获取数据并计算表面变形。每个检测器点处的相位值可以通过取四个连续的强度数据帧来计算，其中参考相位在每个帧之间偏移。位移条纹阶数可以通过从数据点增加或减去2π来分配，直到相邻数据点之间的相位差小于π。实验结果表明，该方法可以精确地确定条纹的一部分，精度为±1°。
A digital phase shifting technique capable of quantitatively determining the phase of holographic interferometric displacement fringes is presented. This technique uses computer control to take data and calculate surface deformation. The phase value at each detector point can be calculated by taking four successive intensity data frames with the reference phase shifted between each frame. The displacement fringe order number can be assigned by adding or subtracting 2π from a data point until the phase difference between adjacent data points is less than π. Experimental results show that this technique can precisely determine a fraction of a fringe with an accuracy of ±1°.