Phase Measurement at Discontinuity by Wavelet Transform Algorithm and Fringe Padding Technique

摘要：

　　This paper presents a phase measurement method at discontinuity by wavelet transform algorithm and fringe padding technique.During fringe analysis,the existing transform-based phase calculation methods can not give correct phase data at discontinuity place because of frequency leakage problem.If the fringe patterns can be extended by fringe padding technique at discontinuity,the frequency leakage will be greatly reduced and even avoided.First,the location of discontinuity needs to be identified by using Wavelet transform and the fringe pattern be extended by fringe padding technique at the discontinuity position.Then,applying Wavelet transform to the padded fringe pattern segments obtains wrapped phase data.After the padded parts are removed,one wrapped phase map is obtained.Finally,in order to independently calculate the absolute phase pixel by pixel,the optimum three-fringe number selection method is used to obtain one absolute phase map.Simulated and experimental data demonstrate the validity of the proposed method to calculate phase information at discontinuity with greatly reduced phase error.

关键词： fringe padding phase measurement at discontinuity Wavelet transform

作者: Zhao-Hui Wang Shu-Jun Huang Zong-Hua Zhang

作者单位: School of Mechanical Engineering, Hebei University of Technology, Tianjin, China

会议类型: 国际会议

会议名称: 第16届机电一体化技术国际会议

会议地点: 天津

会议语种:英文

页码: 106-110

在线出版日期: 2012-10-16（万方平台首次上网日期，不代表论文的发表时间）