Abstract
In this paper, a solid trap/thermal desorption-based odorant gas condensation system has been designed and implemented for measuring low concentration odorant gas. The technique was successfully applied to a medical electronic nose system. The developed system consists of a flow control unit, a temperature control unit and a sorbent tube. The theoretical analysis and experimental results indicate that gas condensation, together with the medical electronic nose system can significantly reduce the detection limit of the nose system and increase the system's ability to distinguish low concentration gas samples. In addition, the integrated system can remove the influence of background components and fluctuation of operational environment. Even with strong disturbances such as water vapour and ethanol gas, the developed system can classify the test samples accurately.
Highlights
An electronic nose is composed of a gas sensor array and a corresponding pattern recognition algorithm
A solid trapping/thermal desorption-based gas condensation system is constructed in this research, which extends the concentration workspaces of current gas sensors
The key parameters of the developed system are discussed, and the theoretical analysis and experimental results indicate that: 1) The developed system has high precision in the operating parameters such as temperature and flow rate to guarantee the repeatability of the integrated system
Summary
An electronic nose is composed of a gas sensor array and a corresponding pattern recognition algorithm. Electronic noses have been applied to many areas such as quality control, environment monitoring [2], and disease diagnosis [3]. Diseases can be diagnosed by utilizing the electronic nose to analyze volatile organic compounds (VOCs) in the exhaled breath of patients. The stable work concentration level of most gas sensors are in part per million (ppm) order, but the pathology marker gas concentration of human exhaled breath is between several parts per billion (ppbs) and several hundred ppbs [7]. A pre-condensation system is essential for the measurement for an enose to diagnose exhaled breath diseases under current precision levels of gas sensors
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.