For explaining auto-system, this paper explains several kinds of sensor.This paper selects idler pulley, CCD sight sensor and light electic sensor as sensor to measure the location of weld beam.

• 在自动化系统设计的论述中，主要介绍几种常用的测量元件，并且选择了导轮跟踪、CCD视觉传感器和光电开关来测量焊缝的位置，并介绍了这些传感元件的设计和应用。