激光与光电子学进展, 2017, 54 (1): 011203, 网络出版: 2017-01-17
四步空域准相移单帧载频条纹相位解调技术 下载: 657次
Four-Step Spatial Quasi-Phase-Shifting Technique for Phase Demodulation from a Single Carrier Fringe Pattern
摘要
提出了一种适合动态光学测量的单帧载频条纹相位解调技术——四步空域准相移技术。基于载频条纹信号的频率调制正弦函数表达形式, 并利用帧内四个区域的积分强度以及四个区域在帧内的相移关系, 推导了该技术的相位解调算法。该算法采用四个区域内的积分强度进行相位计算, 具有较好的高斯白噪声抵抗能力; 计算相位时可隔离不同区域噪声的影响, 具有较高的空间局域性; 可以克服次条纹积分算法中的频率失配问题; 无需进行频率的探测, 提高了相位解调效率, 尤其适合动态测量。实验和仿真结果均证明了所提出方法的可行性和有效性。
Abstract
Four-step spatial quasi-phase-shifting technique, an analysis method for phase estimation from a single spatial carrier fringe pattern, is proposed for dynamic optical measurement. Based on the frequency-modulation form of sinusoidal function for the carrier fringe pattern, the phase demodulation formulas are derived with the intra-frame phase shift relations and the integral intensity in four segments. This proposed algorithm has robustness for white Gaussian noise by using the integral intensity for phase estimation, and has high spatial localization for local noise isolation. It can deal with the problem of frequency mismatch in the sub-fringe integration algorithm. Because the local frequency detection process is not necessary, the computation efficiency for the phase estimation is increased. Particularly, it is suitable for dynamic measurement. The simulation and experimental results demonstrate the feasibility and the validity of the proposed algorithm.
林锦新, 马骁, 李仕萍, 钟金钢. 四步空域准相移单帧载频条纹相位解调技术[J]. 激光与光电子学进展, 2017, 54(1): 011203. Lin Jinxin, Ma Xiao, Li Shiping, Zhong Jingang. Four-Step Spatial Quasi-Phase-Shifting Technique for Phase Demodulation from a Single Carrier Fringe Pattern[J]. Laser & Optoelectronics Progress, 2017, 54(1): 011203.