Sensor is a kind of detection device, can feel the measured information, and can feel the information, according to a certain law to transform into electrical signals or other required forms of information output, in order to meet the information transmission, processing, storage, display, recording and control requirements.
The characteristics of the sensor include: miniaturization, digitization, intellectualization, multi-function, systematization, networking. It is the first step to realize automatic detection and automatic control. The existence and development of sensors, so that objects have a sense of touch, taste and smell and other senses, let the object slowly become alive. Usually according to its basic perception function is divided into thermal sensors, photosensitive components, gas sensors, sensitive components, magnetic sensors, humidity sensors, sound sensors, radiation sensitive components, color sensors and taste sensitive components, such as the top ten categories.