Highly Responsive CO2 Detection by an Improved & Compact Gas Sensor Using Mid-IR Spectroscopy

Mohd Rashidi Salim, Mohd Haniff Ibrahim, Asrul Izam Azmi, Muhammad Yusof Mohd Noor, Ahmad Sharmi Abdullah, Nor Hafizah Ngajikin, Hadi Manap, Gerard Dooly, Elfed Lewis

Abstract


An improved and compact gas sensor using midinfrared spectroscopy for highly responsive Carbon Dioxide (CO2) detection is presented. The sensing principle is based on open-path direct absorption spectroscopy in the mid-infrared region. The improved reflective structure of optical gas sensor consists of low cost and compact components. Several gas cell configuration which includes SISO, 2-MISO, 4-MISO and 8- MISO were simulated using ZEMAX®12 using non-sequential ray tracing technique to get the optimum radius of the reflective curved surface. Sensitivity analysis has shown that the optimised structure of 4-MISO yields the highest sensitivity and power efficiency of -0.2895%-1 and 12.298% respectively. The developed gas sensing system using the optimised gas cell has shown the capability of accurately detecting CO2 concentration between 1.5% and 5.8% with no cross-sensitivity with other gases present in the gas cell. The newly developed CO2 sensor exhibits high responsivity with the recorded rise time and fall time of less than 1 second respectively.

Keywords


Carbon Dioxide Sensor; Mid-Infrared; Responsivity; Spectroscopy;

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ISSN: 2180-1843

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