Researches on a practical system for concentration detection of human exhaled CO2 gas


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.

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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.

Conflicts of Interest

The authors declare no conflicts of interest.


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