Temperature Compensation for Infrared Detection of Carbon Dioxide Concentration

Carbon dioxide (CO₂) concentration monitoring is an important basis for carbon peaking and carbon neutralization. As one of the most widely used technologies in the field of greenhouse gas measurement, non-dispersive infrared (NDIR) detection technology focuses on effectively suppressing temperature drift and ensuring the stability and reliability of long-term monitoring data. The experimental results showed that the light power of the light source, strength of the gas absorption line, and central wavelength of the filter were easily affected by the ambient temperature. In this study, a temperature compensation method for infrared gas detection is proposed, and an analyzer for infrared detection of atmospheric carbon dioxide concentration is developed. Selecting 4.26 μm as the CO₂ gas absorption line with the central wavelength, the temperature compensation experiment of the analyzer was studied using the high and low temperature test chambers. A standard CO₂ gas concentration was configured and concentration calibration experimental research was conducted on the analyzer. The measurement results showed that the infrared CO₂ gas analyzer had the advantages of stable concentration measurement, significant temperature compensation, fast response, and a wide application range. The infrared CO₂ gas analyzer provides reliable data support for terrestrial ecosystem carbon budget monitoring and other fields