Author(s)

Rong-Guo Yan, Bin Ge, Hai-Ming Xie

School of medical instrument and food engineering, University of Shanghai for Science and Technology, Shanghai 200093.

In clinics, especially in the emergency department, carbon dioxide (CO2) is considered as the sixth vital sign in evaluating a patient's medical status. However, its wide applications in developing countries are dissatisfactory due to their high cost compared to their economic growth. In order to develop a practical system for concentration detection of human exhaled CO2 gas for our own, we studied the detection principle based upon the non-dispersive infrared (NDIR) measuring technique and related Lambert-Beer's equation carefully, gave out our functional circuit design of the system, and provided the corresponding graphical user interface (GUI) for CO2 detection. Finally, the experiment shows that it may be a practical system, and will give benefits for the development of our medical care in the future.

CO2 Concentration Detection, NDIR, Lambert-Beer's Equation, Detection Module, Instrument Module

Yan, R. , Ge, B. and Xie, H. (2009) Researches on a practical system for concentration detection of human exhaled CO₂ gas. Journal of Biomedical Science and Engineering, 2, 20-23. doi: 10.4236/jbise.2009.21004.