Sensor (English name: transducer/sensor) is a kind of detection device, which can sense the measured information and transform 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 national standard GB7665-87 defines the sensor as "a device or device that can sense the specified measured signal and convert it into usable signal according to a certain rule (mathematical function rule), usually consisting of sensing elements and conversion elements".
The school enterprise alliance of the Internet of Things of China believes that the existence and development of sensors give objects a sense of touch, taste, smell and other senses, making objects slowly come alive. "
"Sensor" is defined in the new Wechsler dictionary as "a device that receives power from one system and usually sends power to the second system in another form".
The characteristics of sensors include miniaturization, digitalization, intelligence, multifunction, systematization and networking. It is the first link to realize automatic detection and automatic control. With the existence and development of sensors, objects have a sense of touch, taste, smell and other senses, which makes objects slowly come alive. Generally, it can be divided into ten categories according to its basic sensing functions: thermal sensor, light sensor, gas sensor, force sensor, magnetic sensor, humidity sensor, sound sensor, radiation sensor, color sensor and taste sensor.