论文部分内容阅读
为了解决非连续物体三维面形测量中所存在的非连续相位解包问题,采用计算机生成的两频率之比为一无理数的电子光栅作为空间载频光栅条纹投影到待测物体表面。另外结合伽博小波变换分析的相位解调原理,在一幅变形双频光栅图像中分析得到两个频率各自所对应的包络相位分布,并且应用钟金钢等所提出的双频条纹查表法进行解包得到确定的调制相位分布。提出的双频光栅小波变换查表相位解包法很好地解决了傅里叶变换轮廓术,以及连续相位解包法在非连续物体三维面形测量中所存在的问题。给出了详细完整的理论推导过程、计算机模拟以及实验验证,证实了该方法的可行性。
In order to solve the unwrapped phase unwrapping problem existing in the 3D profile measurement of non-continuous objects, a computer-generated electronic grating with an irrational number ratio of two frequencies is projected onto the surface of the object under test as a space carrier grating. In addition, combined with the phase demodulation principle of Gamma wavelet transform analysis, the envelope phase distribution corresponding to each of the two frequencies is analyzed in a deformed dual-frequency raster image, and the application of the dual-frequency fringe look-up table method proposed by Zhong Jigang et al. Unpacking gives a definite modulation phase distribution. The proposed double-frequency grating wavelet transform look-up table phase unpacking method well solves the Fourier transform profilometry, as well as the continuous phase unpacking method in the non-continuous object three-dimensional surface measurement problems. The detailed and complete theoretical derivation, computer simulation and experimental verification are given, which proves the feasibility of this method.