Estrada Julio C, Servin Manuel, Quiroga Juan A
Centro de Investigaciones en Optica, León Guanajuato, México.
Opt Express. 2010 Feb 1;18(3):2632-8. doi: 10.1364/OE.18.002632.
In Phase Stepping Interferometry (PSI) an interferogram sequence having a known, and constant phase shift between the interferograms is required. Here we take the case where this constant phase shift is unknown and the only assumption is that the interferograms do have a temporal carrier. To recover the modulating phase from the interferograms, we propose a self-tuning phase-shifting algorithm. Our algorithm estimates the temporal frequency first, and then this knowledge is used to estimate the interesting modulating phase. There are several well known iterative schemes published before, but our approach has the unique advantage of being very fast. Our new temporal carrier, and phase estimator is capable of obtaining a very good approximation of their temporal carrier in a single iteration. Numerical experiments are given to show the performance of this simple yet powerful self-tuning phase shifting algorithm.
在相移干涉测量法（PSI）中，需要一个干涉图序列，该序列中各干涉图之间具有已知且恒定的相移。在此，我们考虑这种恒定相移未知的情况，并且唯一的假设是干涉图确实具有时间载波。为了从干涉图中恢复调制相位，我们提出了一种自调谐相移算法。我们的算法首先估计时间频率，然后利用这一知识来估计感兴趣的调制相位。之前已经发表了几种著名的迭代方案，但我们的方法具有非常快速的独特优势。我们新的时间载波和相位估计器能够在单次迭代中获得其时间载波的非常好的近似值。给出了数值实验以展示这种简单而强大的自调谐相移算法的性能。
