Semiconductor gas sensor

Semiconductor type gas sensor is based on a metal oxide or a metal oxide material made ​​of semiconductor detection element interacts with the gas generated on the surface or reaction , causing movement of carriers characterized by conductivity or volt-ampere characteristics or surface potential changes in the gas concentration measurement . The mechanism Engine Water Temperature Sensor from the control surface can be divided into type ( using a gas adsorbed on the surface of the semiconductor conductivity changes arising from the sensitive element ) , surface potential type ( adsorbed gas generated after the use of semiconductor surface potential or the zeta potential change of the gas sensitive element ) , Volume controlled ( based semiconductor react with the gas when the volume change, thus changing the working principle of generating electrical conductivity ), etc. Percentage can detect concentrations of combustible gases can be detected ppm level toxic and harmful gases. Has a simple structure , high sensitivity , fast response , and many other practical advantages , but its main deficiency is a measure of the linear range is small , by the background gas interferences , susceptible to ambient temperature and so on.