摘要
为解决双频外差法展开条纹相位中出现跳跃性变化的问题,提出了一种改进方法。首先,根据外差原理计算出条纹级数的小数部分,再由该条纹级数对应频率的光栅条纹的相位主值计算出当前小数部分的实际值。然后,根据相位主值自身误差设置判定阈值,并用该阈值对上述计算值与实际值的差值进行判断。最后,根据判断结果对中间参量的周期次数进行加或减的调整,以校正绝对相位。通过在仿真双频条纹图案的相移图中加入不同均值和方差的高斯噪声,对比校正前后的相位图,分析了改进方法对相位跳跃性误差的校正率,并通过样件实测实验来验证该方法的实用效果。实验结果表明,该改进方法对绝对相位跳跃性误差的校正率可达90%以上,具有较强的抗噪性和实用性。
To address the problem of abrupt changes during the phase unwrapping of fringes using the dualfrequency heterodyne method,we proposed an improved method in this study.First,the fractional part of the fringe order at a frequency was calculated based on the heterodyne principle,and the actual value of the current decimal part was calculated based on the phase principal value of the grating fringe corresponding to the frequency of the fringe order.Second,the difference between the decimal parts of the above two values was determined using a set threshold based on the inherent error of the phase principal value.Finally,the absolute phase was corrected by adding or subtracting the cycle number of the intermediate parameter based on the determination results.By adding Gaussian noise with different mean values and variances to the phase shift diagram of the simulated dual-frequency fringe pattern,and comparing the phase diagrams before and after correction,the correction rate of the improved method for phase jump errors was analyzed.In addition,the practical effect of the method was verified through actual measurement experiments of samples.The experimental results indicate that the improved method yields a correction rate of over 90% for absolute phase jump errors,with a high practicability and immunity to noise.
作者
雷经发
陈志强
张淼
孙虹
李永玲
LEI Jing-fa;CHEN Zhi-qiang;ZHANG Miao;SUN Hong;LI Yong-ling(School of Mechanical and Electrical Engineering,Anhui Jianzhu University,Hefei 230601,China;Key Laboratory of Intelligent Manufacturing of Construction Machinery,Department of Education of Anhui Province,Hefei 230601,China;Anhui Simulation Design and Modern Manufacture Engineering Technology Research Center,Huangshan 245041,China)
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2021年第6期1337-1345,共9页
Optics and Precision Engineering
基金
安徽省重点研究与开发计划资助项目(No.1804a09020009)
安徽省高等学校自然科学研究重点项目(No.KJ2019A0709)
安徽省仿真设计与现代制造工程技术研究中心开放研究项目(No.SGC⁃ZXYB1806)
过程装备与控制工程四川省高校重点实验室开放基金资助项目(No.GK201819)
安徽建筑大学引进人才及博士启动基金项目资助(No.2018QD38)。
关键词
光学三维测量
双频条纹
条纹级数
相位展开
相位跳跃
误差校正
optical three-dimensional measurement
dual-frequency fringe
fringe order
phase unwrap⁃ping
phase jump
error correct