Sensor (English name: transducer/sensor) is a detection device that can sense the measured information and convert the sensed information into electrical signals or other required forms of information output according to certain rules to meet the requirements of information transmission, processing, storage, display, recording, and control.

The existence and development of sensors have enabled objects to have senses such as touch, taste, and smell, making them live. Sensors are extensions of human five senses.

Sensor has the characteristics of miniaturization, digitization, intelligence, multi-function, systematization, networking, etc. It is the primary link to achieve automatic detection and control.