关键词: 快速博里叶变换, 面外云纹, 频谱分析, 相位法

Abstract: The fundamental laws and features of the phase detection method for noncontact whole-field 3-D surface measuring have been investigated by method of optical function an Fourier spectral analyses. On the basis of analyzing the characteristics of the modulated grdating image in the frequency domain, the accurate phases and 3-D informations of testing surface are obtained. Therefore, the automatic profilometry of the 3-D object by computer has been completed and successfully applied to a automobile body part with good accuracy.

Key words: Fast Fourier transform, Out-of-plane Moire, Phase detection method, Spectral analyses