Transducer/sensor (English Name:) is a kind of detection device, can feel the information being measured, and can feel the information, according to a certain law of the electrical signal or other required forms of information output, to meet the information transmission, processing, storage, display, record and control, etc..

The characteristics of the sensor include: miniaturization, digital, intelligent, multi functional, systematic, networking. It is the first step to realize automatic detection and automatic control. The existence and development of the sensor, so that the object has a sense of touch, taste and smell and other senses, so that objects slowly become alive. Generally based on its basic sensing function is divided into heat sensitive components, photosensitive components, gas sensors, force sensors, magnetic sensors, humidity sensors, acoustic sensors, radiation sensitive components, color sensitive components and components, such as ten categories.