AI 中文总结
本文提出一种摄影测量技术，结合局部机械测量，可实现Mu2e探测器模块间的精确快速对准，满足探测器计量要求。
AI 中文摘要
本文讨论一种用于测量Mu2e探测器模块间对准的摄影测量技术。该探测器包含216个模块，每个模块有96根 straw tube（ straw 管）。模块内 straw 管的相对对准此前通过X射线技术测量，该技术将 straw 管测量与每个模块的三个基准点关联。摄影测量技术使用由15台相机组成的阵列，在探测器全局坐标系中对模块基准点进行精确位置测量。相机CCD上基准点位置和半径的测量在横向方向产生约25μm的分辨率，沿相机轴方向分辨率小于300μm。此外，本文描述了一种将图像与“局部”机械测量相结合的方法，可使沿相机轴方向的精度达到小于100μm。该技术提供了一种无接触、快速（约1小时）且经济的计量方法，符合探测器的要求。
英文摘要
We discuss a photogrammetry technique to measure the inter-module alignment in the Mu2e tracker. The tracker consists of 216 modules each with 96 straw tubes. The relative alignment of the straw tubes in a module was previously measured by an X-ray technique, which tied the straw tube measurements to three fiducials per module. The photogrammetry technique uses an array of 15 cameras to make precise position measurements of the module fiducials in a global tracker coordinate system. Measurements of the fiducial position and radius on the camera's CCD yield ~$25 μm$ resolution in the transverse directions and < $300 μm$ along the camera axis. In addition, we describe a procedure to combine the images with "local" mechanical measurements to yield $<100 μm$ precision along the camera axis. The technique offers a touch-less, rapid (~1 hour), and affordable metrology approach within the requirements of the tracker.
Comments15 pages, 15 figures. Submitted to Nuclear Instruments and Methods in Physics Research A
