相移阴影莫尔基于迭代LSM拟合

相移阴影莫尔技术相位高度存在着非线性关系,无法在全场获得均匀相移,因而致使经典的相移算法不能得到精确解.对此,提出了一种基于最小方差迭代的相移阴影莫尔技术,该技术通过垂直光栅面等间距移动光栅来产生相移,但光栅移动距离可不采用固定值,所以相移过程灵活|使用在高度解调过程中确定的逐点相移增量来抽取精确的测量相位,实现了相移阴影莫尔技术中固有的相位高度非线性误差补偿.结果表明,该方法可通过干涉图计算光栅的移动量,具有相移器的自标定特性.

Phase Shifting Shadow Moiré|by Iterative Least-squares Fitting

Shifting shadow moiré iterative algorithm and procedures for both the calibration of phase shifter and noise reduction approaches are proposed.Compared with the traditional shifting shadow moiré method,the proposed method is insensitive to the height dependent effects and can determine the point-wise phase step during the process of demodulation.The effectiveness of the proposed method is demonstrated by both simulations and experiments.They are shown that the proposed method can effectively minimize the effects of the phase-shifting errors and possess a superior performance than existing typical phase shifting algorithms in shifting shadow moiré technique.