a device that can react to light, heat, pressure, etc. in order to make a machine, etc. do something or show something （探测光、热、压力等的）传感器，敏感元件 security lights with an infrared sensor (= that come on when a person is near them) 带红外线传感器的保安灯
Oxford Collocations DictionarySensor is used after these nouns:- motion
- pressure
- temperature
- …
Word Origin1950s: from sensory, on the pattern of motor.