photoelectric position detector

例句：

1. 1. The photoelectric position detector is used to detect the presence of objects in the fieldof view.
   光电位置探测器用于检测视场中物体的存在。
2. 2. The photoelectric position detector is an important component of the security system.
   光电位置探测器是安全系统的一个重要组成部分。
3. 3. The photoelectric position detector can be used to monitor the movement of people and vehicles ina crowded area.
   光电位置探测器可用于监控拥挤区域的人和车辆移动。