DEVELOPMENT OF A NON-DISPERSIVE INFRARED GAS ANALYZER FOR MEASURING THE DYNAMICS OF GREENHOUSE GASES CONCENTRATIONS

Monitoring of the greenhouse gases concentrations and their dynamics is a fundamental and crucial task in environmental monitoring. Gases such as water vapor, carbon dioxide, methane, and others enter the atmosphere through both natural processes and anthropogenic activities. The accumulation of these gases enhances the greenhouse effect, negatively impacting human health, agriculture, and the environment as a whole.  Therefore, the development of devices capable of determining atmospheric greenhouse gas concentrations is vital. Optical measurement methods, including nondispersive infrared (NDIR) spectroscopy, offer non-contact and automated measurement of gaseous mixture components. The NDIR gas analyzer presented in this work registers radiation at a wavelength of 4.26 µm to determine carbon dioxide concentration (with provision for water vapor detection). The resulting signal is normalized using a reference channel tuned to 3.95 µm. The mathematical model, developed using MATLAB and Python programming languages, processes the experimental data to determine atmospheric carbon dioxide concentrations. The developed device is an open-path gas analyzer, enabling its use in diverse environments due to its reduced power consumption.  This instrument is applicable for carbon polygon monitoring and for quality control of low-Earth orbit satellites performing atmospheric greenhouse gases monitoring.

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