采用标记条纹跟踪的冲击过程三维轮廓术

3-D profilometry for the impact process with marked fringes tracking

针对在冲击、爆轰等快变化过程的三维轮廓术中,CCD拍摄速度低于物体的运动速度而导致对动态条纹的时间采样不足和物体表面发生破裂而分成数块的动态过程,提出一种采用标记条纹进行跟踪的动态过程三维轮廓术。以傅里叶变换轮廓术为基础,通过采用标记条纹进行跟踪锁定变形条纹中同级次条纹的变化以及Gerchberg迭代算法在破裂区域迭代生成伪条纹,对破裂表面分块进行处理,有效地解决了在快变化动态过程的三维重建中因时间采样不足和条纹断裂对三维相位场的展开所带来的问题,获得了物体正确的面形分布。实验证实了此种方法的正确性。

In the quick change process of impact or blast, sampling rate of CCD is lower than object move rate, which result in deficiency of CCD＇s sampling and breaking surface of measured object. Therefore, a novel method of 3-D restoration for high speed movement process was proposed in this paper. Based on Fourier Transform Profilometry （FTP）, some problems caused by deficiency of sampling and breaking fringes were solved in 3-D phases unwrapping by marked fringe tracking, Gerchberg iterative algorithm and multipartite processing, and the proper 3-D shape of measured object was obtained. Experiment proves the feasibility of this method.