A 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, and display. , recording and control requirements. It is usually composed of sensitive components, conversion elements, signal conditioning and conversion circuits and other auxiliary components. The sensitive element accepts the measured value and outputs other quantities that have a definite relationship with the measured value. The conversion element converts other quantities from the sensitive element into an electrical signal suitable for transmission and measurement. The electrical signal suitable for output and measurement is passed through the signal conditioning and conversion circuit. It is converted into a useful electrical signal that can be displayed, recorded, processed and controlled, and finally the useful electrical signal is transmitted to other devices for communication.