Monitoring of Air Contaminant Gases Using a UV-Based Optical Sensor

This paper presents the development and evaluation of an ultraviolet (UV) based optical gas sensor module for air pollution monitoring applications. The proposed system is capable of accurately measuring concentrations of nitrogen dioxide (NO2), ozone (O3), and sulphur dioxide (SO2) by exploiting the principles of light absorption and scattering. Comparative analysis with data from the reference sensor demonstrates a strong correlation, validating the reliability and accuracy of the designed gas sensor module. Unlike traditional electrochemical gas sensors, which necessitate a complex analog front end (AFE) to detect gas concentrations, our designed module offers a more cost-effective solution with enhanced sensitivity and a compact design. This paper elucidates the working principle, design considerations, and experimental results of the proposed gas sensor module, highlighting its advantages over conventional sensors.