A semiconductor gas sensor is a sensor based on the interaction between gas and semiconductor materials. When the gas to be measured comes into contact with a semiconductor material, the gas molecules will react with the semiconductor surface, causing the conductivity of the semiconductor to change. By measuring changes in conductivity, the presence and concentration of gases can be determined.

Summary: The above are several common Gas detector sensor working principles. Electrochemical gas sensors detect gas concentration by measuring charge transfer, optical gas sensors detect gas concentration by measuring changes in light signals, thermal conductivity gas sensors detect gas concentration by measuring changes in temperature, and semiconductor gas sensors measure changes in conductivity to detect gas concentration. Each of these sensors has its own characteristics and scope of application. In practical applications, the appropriate sensor can be selected according to needs to monitor and control gas concentration.