介绍了一种适用于管道内壁缺陷检测的三维重建系统。利用条纹投影的傅里叶变换轮廓术,采用两个普通显微物镜及振幅光栅构建了一套测量管道内壁三维形貌的装置,并对该装置进行了实验测试。利用显微物镜能得到小型物体放大清晰的像,从而实现了测量小型物体的三维形貌。此装置在驱动机构的带动下沿着管道轴线行进时,可以对管道内壁状况进行实时非接触检测,从计算机中重构出内壁的三维形貌具有较高的精度。实验结果证实了此方法的有效性和实用性。这种方法能缩小整个投影装置的体积,易于实现装置集成化,并能很好地应用于管道内壁的三维形貌的测量,具有明显的实用前景。

A miniaturized non-destructive optical system for measuring the 3D flaws of inner surface of a pipe is proposed,which is based on Fourier transform profilometry (FTP) using two microscopes and an amplitude grating. It is possible to get a magnified and clear image of a small object by using a microscope. The images of the inner surface of pipe can be non-contact captured in real time when the sensor is moving along the pipe driven by a micro-robot. Experimental results show that the reconstruction of 3D surface of the inner surface is obtained with high precision. This method can be used to measure the 3D shape of pipe inner surface,so it should be interesting for practical applications.