相移阴影莫尔基于迭代LSM拟合  

Phase Shifting Shadow Moiré by Iterative Least-squares Fitting

作　　者：杜虎兵[1,2] 赵宏[1] 李兵[1] 李正伟[1] 郑亮[1] 冯磊磊[1] 

机构地区：[1]西安交通大学机械制造系统工程国家重点实验室,西安710049 [2]西安航空技术高等专科学校,西安710077

出　　处：《光子学报》2011年第7期978-982,共5页Acta Photonica Sinica

基　　金：国家重点基础研究发展计划(No.2009CB724207);国家自然科学基金(No.50975228)资助

摘　　要：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.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.

关 键 词：算法 阴影莫尔 相位 相移 

分 类 号：O432.2[机械工程—光学工程]