基于时域小波变换相位提取的三维形貌测量

提出基于时域小波变换的连续振动物体相位提取方法,恢复连续振动物体的瞬时三维形貌。将小波变换用于序列影栅云纹相位分析中,对连续振动物体的序列影栅图像进行处理,利用小波变换的多分辨力特点,对各点的灰度变化进行连续复小波变换,通过提取小波脊所对应的相位,得到各点相对于基准光栅的完整相位调制信息,从而获取运动物体的瞬时三维形貌。利用该方法对连续振动悬臂梁进行了分析,得到连续振动悬臂梁的瞬时速度及瞬时三维形貌,再现了悬臂梁的连续振动过程。为研究动态物体瞬时特性提供了一种新的方法。

Instantaneous Three-Dimemsional Profile Measurement Based on Temporal Wavelet Transform

The method for the phase extraction of a continual deformation object based on the temporal wavelet transform is proposed.By introducing the temporal wavelet transform method to analyze the time-sequence fringe patterns,the modulated phase distribution relative to the fundamental frequency is obtained.The gray value along time is evaluated point by point by using the continuous wavelet transform.Due to the frequency localization property of the continuous wavelet,the instantaneous velocity and high-quality threedimensional surface-profile at different instants of a continuoual deformation object is obtained.A cantilever beam with a continual deformation is detected.The experimental result well demonstrates the validity of this method and retrieves the process of the continual vibrating of the beam.The temporal wavelet transform method provides a new method to analyze the kinetic characteristic of a continual deformation object.