High-precision double-range infrared gas sensor and high-precision double-range infrared gas analysis method

A high-precision double-range infrared gas sensor, comprising a chamber;

• wherein an outer frame of the chamber is configured as an enclosed structure, and a reflective portion, configured as an enclosed structure, is arranged on an inner wall of the chamber;
• a first light source, a second light source and an infrared detector are arranged in an interior space of the chamber;
• light emitted by the first light source is reflected by the reflective portion and then captured by the infrared detector to form a long path gas chamber L1 for detecting a first concentration gas;
• light emitted by the second light source is reflected by the reflective portion and then captured by the infrared detector to form a short path gas chamber L2 for detecting a second concentration gas;
• the first light source and the second light source are controlled by a control module which comprises a light source drive unit, a control unit and an operational amplification unit;
• a detection signal of the infrared detector is amplified by the operational amplification unit and then transmitted to the control unit;
• the control unit generates a control signal by time-sharing control, and the control signal is transmitted to the first light source and the second light source by means of the light source drive unit;
• and
• a concentration of the first concentration gas is less than that of the second concentration gas.