摘要
实时全息干涉法可以观察记录整个测试过程中条纹图的动态变化,传统相位提取算法只适合于静态干涉条纹图相位的提取。根据实时全息干涉条纹和希尔伯特变换的特点,提出了利用希尔伯特变换提取实时全息干涉条纹相位值的方法,采用了高通滤波的方法减少背景光强的影响,对铝片受力变形实验中实时全息干涉条纹的相位变化分布进行了提取。实验表明:希尔伯特变换法适合于动态条纹的相位提取,可以自动提取实时全息干涉测量过程中全场各点在任意两个时刻间的相位变化值,且测量结果与实时全息干涉条纹人工分析结果一致。
Dynamic fringe pattern can be observed throughout the testing by real-time holographic interferometry, while the traditional method is only suitable for static fringe pattern in phase extracting. Based on the characteristics of real-time holographic interferometry fringe pattern and.Hilbert transform, the method of phase extracting with Hilbert transform is presented for real-time holographic interferometry fringe pattern. High-Pass filter method is used to reduce the influence of the bias intensity, and the fringe pattern phase change has been obtained in the experiment of aluminum deformation. The experiment results show that the Hilbert transform method can be applied to dynamic fringe pattern in phase extraction and extract the phase difference between any two moments at any point in the field of real-time holographic interferometry. Moreover, the automatic measurement results are consistent with man-made results.
出处
《光电工程》
CAS
CSCD
北大核心
2009年第4期92-96,共5页
Opto-Electronic Engineering
关键词
希尔伯特变换
实时全息干涉
相位提取
Hilbert transform
real-time holographic interferometry
phase extracting
