Phase-shift algorithm for white-light interferometry insensitive to linear errors in phase shift
Phase-shift algorithm for white-light interferometry insensitive to linear errors in phase shift
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DOI：
10.1007/s10043-008-0024-x
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发表时间：
2008-06
期刊：
影响因子：
1.2
通讯作者：
M. Adachi
中科院分区：
文献类型：
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作者：
M. Adachi
白光干涉具有条纹对比度的变化。将相移技术应用于白光干涉时，要求相移算法能在对比度变化的情况下准确提取相位。通常还有另一个要求，即帧之间的相移不应限于π/2。计算机模拟表明，著名的算法有不可忽略的误差下，这两个要求。为了找到一个算法，这将满足的要求，我提取的算法方程中的个别条款（Ij <$Ik）考虑对称性的光强度对相位，其中Ij是光强度后，第j个相移。使用计算机模拟，我寻找适当的系数乘以方程中的条款，最后找到一个算法，满足这两个要求与相移使用。
White-light interference has changes in fringe contrast. When phase-shift techniques are applied to white-light interference, the phase-shift algorithm which can extract the phase accurately under the contrast changes is required. There is often another requirement that the phase shift between frames should not be restricted toπ/2. Computer simulations show that the well-known algorithms have non-negligible errors under both requirements. To find an algorithm which will satisfy the requirements, I extract individual terms (Ij∓Ik) in an algorithmic equation by considering symmetry of light intensity against phase, whereIjis light intensity just after thej-th phase shift. Using computer simulations, I search for appropriate coefficients by which the terms are multiplied in the equation, finally finding an algorithm which satisfies both the requirements with the phase shift used.