激光与光电子学进展, 2016, 53 (10): 100501, 网络出版: 2016-10-12   

基于正则化主量分析的相移阴影叠栅解调技术

Phase Shift Shadow Moiré Demodulation Based on Normalized Principal Component Analysis
作者单位
1 西安工业大学机电工程学院, 陕西 西安 710021
2 西安交通大学机械制造系统工程国家重点实验室, 陕西 西安 710049
摘要
传统的相移阴影叠栅轮廓术在垂直于光栅面方向移动光栅实现相移,由于相移是非线性的,需要较多帧的条纹图进行相位解调。为了减少条纹图帧数,节约测量时间,并简化测量过程,提出一种基于主量分析法的三帧随机相移阴影叠栅技术。主量分析法通过时域平均去除背景,对较少帧的条纹图直接使用主量分析法会产生直流分量去除误差,因而先将条纹图正则化,再应用主量分析法求取相位。实验表明,相对于直接使用主量分析法,利用正则化主量分析法可以明显减小测量误差。分别使用正则化主量分析法和五步相移法对同一物体表面进行测量,两次测量结果之差在±5 μm内,说明了正则化主量分析法的有效性。
Abstract
Conventional phase shifting shadow moiré profilometry usually needs more phase shifting images to demodulate the measurement phase because of the nonlinear phase shifting. The data sampling process is time-consuming and the measurement method is complex. We proposed a random three-frame object surface measurement method based on the principal component analysis and the shadow moiré profilometry. The phase shift is introduced by translating grating perpendicular to its own plane. Given that the background of captured fringe patterns is a smooth signal, we firstly normalized the sampled fringe patterns. Then principal component analysis based phase shifting algorithm is used to estimate the phase. The proposed method is fast and can be implemented easily in many applications. We also did optical experiments to demonstrate the effectiveness of the proposed method by referring to the result of conventional five-step phase shifting shadow moiré. The results show that the difference of the measurement results is within ±5 μm.

杜虎兵, 艾永旭. 基于正则化主量分析的相移阴影叠栅解调技术[J]. 激光与光电子学进展, 2016, 53(10): 100501. Du Hubing, Ai Yongxu. Phase Shift Shadow Moiré Demodulation Based on Normalized Principal Component Analysis[J]. Laser & Optoelectronics Progress, 2016, 53(10): 100501.

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