What is sensor? What is sensor composed of?

What is sensor? What is a sensor composed of?

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

The characteristics of sensors include: miniaturization, digitization, intelligence, multi-function, systematization, and networking. It is the first link to realize automatic detection and automatic control. The existence and development of sensors allows objects to have senses such as touch, taste, and smell, and makes objects slowly become alive. It is usually divided into ten categories according to its basic sensing functions, including thermal elements, photosensitive elements, gas-sensitive elements, force-sensitive elements, magnetic-sensitive elements, humidity-sensitive elements, sound-sensitive elements, radiation-sensitive elements, color-sensitive elements, and taste-sensitive elements. .

The composition of the sensor

The sensor is generally composed of four parts: sensitive element, conversion element, conversion circuit and auxiliary power supply.

The sensitive element directly senses the measured value and outputs a physical quantity signal that has a definite relationship with the measured value; the conversion element converts the physical quantity signal output by the sensitive element into an electrical signal; the conversion circuit is responsible for amplifying and modulating the electrical signal output by the conversion element; the conversion element and The conversion circuit generally also needs auxiliary power supply.