Time：2015/10/22 13:00:18

 Sensor is a physical or chemical transformation of quantity to facilitate the application of electrical devices can. International Electrotechnical Commission: Definition (IEC International Electrotechnical Committee) as: "sensor is a measurement system in a front member, it will convert the input variable for measuring the signal." In accordance Gopel like to say is: "sensor comprising a carrier and a sensor circuit convergence" and "sensor system is a combination of some kind of information processing (imitation or digital) to the system." Sensor is an integral part of the sensing system, it is to measure the signal input the first pass.

Sensors convert some form of energy into another form of energy. There are two types: active and passive. Active sensors can kind of energy directly into another, do not need an external source of energy or encouragement.