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Development of laser-welded thin wall stainless steel pipe

机译：激光焊接薄壁不锈钢管的开发

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Abstract: Curved micro-tunneling using small conduit pipes with diameters of 1m or less is recently applied in many construction sites. We have come up with a new position sensing system to pinpoint the head of the first pipe even when it cannot be seen directly from the base position. It differs from the traditional method of using the collimated laser beam, in that a diode laser with a large divergence is used as the point source of light. The direction of the point source of light is detected by using an objective lens and CCD camera. To apply this method to the position detection of the first pipe, the structure of the sensing unit and its detection accuracy were examined and the following result were obtained. (1) The structure using a polarized beam splitter can suppress error led by rotating the sensing unit. (2) Through simulation and some field test, 20 seconds or less detection accuracy of direction angle was achieved. !3
机译：摘要：最近在许多建筑工地中使用直径为1m或更小的小型导管的弯曲微隧道技术。我们提供了一个新的位置感应系统，即使在基本位置无法直接看到第一根管子的头部时，也可以精确定位。它与使用准直激光束的传统方法不同，之处在于将发散较大的二极管激光器用作点光源。点光源的方向通过使用物镜和CCD摄像机进行检测。为了将该方法应用于第一管道的位置检测，检查了感测单元的结构及其检测精度，并获得了以下结果。 （1）使用偏振分束器的结构可以抑制因旋转感应单元而导致的误差。 （2）通过仿真和一些现场测试，获得了20秒或更短的方向角检测精度。 ！3

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