1. sensor is a detection device that can sense the measured information and convert the measured information into electrical signals or other required information according to certain rules to meet the requirements of information transmission, processing, storage, display, recording and control.

2. The sensor has the characteristics of miniaturization, digitalization, intelligence, multifunction, systematization and networking, which is the first step to realize automatic detection and control. The existence and development of sensors make objects have senses such as touch, taste and smell, and make them come alive slowly.

3. According to its basic sensing function, it can be divided into ten categories: thermal sensor, photosensitive sensor, gas sensor, force sensor, magnetic sensor, humidity sensor, acoustic sensor, radiation sensor, color sensor and taste sensor.

Extended data:

1. sensor has the characteristics of miniaturization, digitalization, intelligence, multifunction, systematization and networking. It not only promotes the transformation and upgrading of traditional industries, but also may establish new industries, thus becoming a new economic growth point in 2 1 century. Miniaturization is based on MEMS technology, and has been successfully applied to silicon devices to make silicon pressure sensors.

2, the function of the sensor is usually compared with the five senses of human beings:

Photosensitive sensor-vision

Auditory sensor

Gas sensor-sense of smell

Chemical sensor-taste

3, the classification of sensitive components:

Physics is based on physical effects such as force, heat, light, electricity, magnetism and sound.

Chemistry, based on the principle of chemical reaction.

Biology is based on molecular recognition functions, such as enzymes, antibodies and hormones.

Generally, according to their basic sensing functions, they are divided into ten categories: heat sensitive elements, light sensitive 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 (some people divide sensitive elements into 46 categories).