基于线性相位FIR滤波的三维曲面的光学检测

3 D Surface Optical Measurement based on Linear phase FIR Filter

利用一组规则栅线投影到物体表面的畸变光栅，采用线性相位ＦＩＲ滤波技术解调出含有物体表面高度信息的相位。建立了一种较二维ＦＦＴ法更快，精度较高的光学检测技术。该技术只需采集一幅图象，不需要确定条纹级次，不存在“凹凸模糊”的问题。文中给出了一个典型试件的实验结果及分析。

An optical tehcnique for 3 D shape measurement is set up.The technique,based on a deformed projected grating pattern which carries the 3 D information of the measured object,can automatically and accurately obtain the phase map of a measured object by using a liner phase FIR filter.In contrast to the 2 D FFT technique,the technique is much faster.Only one image pattern is sufficient for measuring.The phase map can be processed without assigning fringe orders and making distinction between a depression and an elevation.Theroetical analysis and experimental result are presented.