infrared ray detector

例句：

1. 1. Theinfrared ray detector was usedto detect the presence of a person inthe dark room.
   红外线探测器被用来探测黑暗房间中的人的存在。
2. 2. The infrared ray detectoris an essential tool for securitypersonnel during night patrols.
   红外线探测器是安保人员夜间巡逻时必不可少的工具。
3. 3. Theinfrared ray detector can beused to detect heat sources in the environment.
   红外线探测器可以用来探测环境中的热源。