A sensor ( transducer) is a detection device that can sense the information being measured, and can transform the sensed information into electrical signals or other required forms of information output according to certain rules to meet the information Requirements for transmission, processing, storage, display, recording, and control.
The characteristics of sensors include: miniaturization, digitization, intelligence, multi-function, systemization, and networking. It is the first link to realize automatic detection and automatic control. The existence and development of sensors give objects the sense of touch, taste and smell, and make objects slowly become alive. It is usually divided into ten categories according to its basic sensing function: heat sensitive 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 national standard GB7665-87 defines a sensor as: " A device or device that can sense the specified measurement and convert it into a usable signal according to a certain rule ( mathematical function law), usually composed of sensitive components and conversion components."
The China Internet of Things School-Enterprise Alliance believes that the existence and development of sensors give objects the sense of touch, taste and smell, and make objects slowly become alive. "
"Sensor" is defined in the New Wei-style dictionary as: "A device that receives power from one system and usually sends power to a second system in another form."
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