Talk:CO2 Concentration Detector

Team Members

Zhao Yun A0295128X Xie Zihan A0295111M Zhang Wenbo A0307226L

Introduction

Carbon dioxide (CO₂) is a critical greenhouse gas whose concentration monitoring is essential for various applications, including environmental protection, industrial process control, and indoor air quality management. One effective method for detecting CO₂ concentrations relies on the molecule's specific absorption characteristics in the infrared region.

CO₂ exhibits a strong absorption peak at a wavelength of 4.26 μm, which corresponds to its fundamental vibrational mode. By exploiting this property, we can design an optical detection system that measures the intensity attenuation of infrared light at this wavelength as it passes through a gas chamber containing CO₂. According to the Beer–Lambert law, the degree of light absorption is directly related to the concentration of the absorbing gas, enabling quantitative analysis:

$A={\log }_{10}\left(\frac{I_0}{I}\right)=\epsilon cL$

In this project, we aim to develop such a detection apparatus. The system comprises an infrared light source centered at 4.26 μm, a gas chamber, and an infrared detector. By monitoring the reduction in light intensity after it traverses the gas chamber, the CO₂ concentration can be inferred. This method offers non-invasive, real-time measurement capabilities and has the potential for high sensitivity and specificity.