摘要
移相误差是用移相法进行相位测量的主要误差。本文提出一种 5步移相算法 ,分两步进行相位计算 ,首先估计实际步进移相的线性移相误差 ,然后再利用此移相误差估计值计算相位分布。移相误差估计公式和相位计算公式简洁 ,算法简单易行 ,对线性移相误差和二次谐波的敏感度低 ,可基本消除线性移相误差对解调相位的影响。对本文提出的算法进行了仿真研究 ,同时给出了 Hariharan 5步算法、Surrel 6步最小算法的仿真结果。结果表明 :本算法明显优于以上两种算法 ,可基本消除线性移相误差引起的相位偏移。本算法适用于作等步移相的相位测量或移相的标定。
A new error compensating five sample phase shifting algorithm which is insensitive to phase shift error is proposed to retrieve the phase distribution of a fringe pattern It includes two steps First, the linear phase shift error is estimated using four sample images Then, phase distribution is calculated with error corrected using the phase shift error estimated in the first step As the equations of error estimation and phase calculation are simple, this new algorithm is practical as well as effective Computer simulations were carried out to verify the effectiveness of the algorithm Results of two other well known error compensating algorithms are also presented, which show the new algorithm is the least sensitive to phase shift error It is concluded that the proposed algorithm can accurately estimate the linear phase shift error and eliminate the resulting phase deviation, even in the presence of second harmonic distortion
出处
《光学技术》
CAS
CSCD
2000年第6期565-567,共3页
Optical Technique
