用于二氧化碳浓度红外检测的温度补偿研究

Temperature Compensation for Infrared Detection of Carbon Dioxide Concentration

二氧化碳(carbon dioxide,CO_(2))浓度监测是实现碳达峰、碳中和的重要基础,非分散红外(non-dispersive infrared,NDIR)检测技术作为温室气体测量领域应用最为广泛的技术之一,如何有效抑制温度漂移、确保长期监测数据的稳定性和可靠性是研究重点。实验表明,光源光功率、气体吸收线强、滤光片中心波长等容易受到环境温度影响。文中提出一种红外气体检测的温度补偿方法,研制了用于大气二氧化碳浓度红外检测的分析仪。选取以4.26μm为中心波长的CO_(2)气体吸收线;利用高低温试验箱,对分析仪进行温度补偿实验研究;配置标准CO_(2)气体浓度,对分析仪进行浓度标定实验研究。测量结果表明,红外CO_(2)气体分析仪浓度测量稳定,温度补偿显著,具有快速响应、应用范围广等优点。该红外CO_(2)气体分析仪为陆地生态系统碳收支监测等领域提供可靠数据支撑。

Carbon dioxide(CO_(2))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 4.26mm as the CO_(2) 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 CO_(2) gas concentration was configured and concentration calibration experimental research was conducted on the analyzer.The measurement results showed that the infrared CO_(2) gas analyzer had the advantages of stable concentration measurement,significant temperature compensation,fast response,and a wide application range.The infrared CO_(2) gas analyzer provides reliable data support for terrestrial ecosystem carbon budget monitoring and other fields.