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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 three-dimensional reconstruction system suitable for the detection of pipeline wall defects is introduced. Using the Fourier transform profilometry of streak projection, a set of devices for measuring the three-dimensional topography of the inner wall of the pipeline was constructed by using two ordinary microscope objectives and amplitude grating, and the device was tested experimentally. The use of microscope objective lens can be enlarged and clear images of small objects, enabling the realization of the three-dimensional shape of small objects. When driven by the driving mechanism, the device can conduct real-time non-contact detection of the condition of the inner wall of the pipeline when it is driven along the axis of the pipeline. The three-dimensional topography of the inner wall is reconstructed from the computer with higher accuracy. The experimental results confirm the validity and practicability of this method. This method can reduce the size of the whole projection device, easy to realize device integration, and can be well applied to the measurement of the three-dimensional topography of the inner wall of the pipeline, with obvious practical prospect.