CO, CO2 and SO2 three-component infrared integrated gas sensor

The invention relates to a CO, CO2 and SO2 three-component infrared integrated gas sensor which comprises a shell, an infrared light source, a gas inlet, a gas outlet, a gas chamber, three groups of integrated detectors consisting of infrared measuring detectors with different particular wavelength light filters and infrared reference detectors with different particular wavelength light filters, a signal amplification processor, a temperature sensor, a singlechip system and an audible and visual alarm system. The gas sensor can be used for monitoring and detecting three gases such as CO, CO2 and SO2 simultaneously by utilizing selective absorption of CO, CO2 and SO2 gas molecules on infrared light, can stably and reliably operate in a severe environment for a long time, has high interference resistance, is simple in structure and convenient to operate and is capable of simultaneously detecting the three gases and storing data, and the processing cost is greatly reduced while the detection precision is further improved.