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Development of a low-cost NDIR system for ppm detection of carbon dioxide in exhaled breath analysis
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Vincent, Timothy A., Urasinska-Wojcik, Barbara and Gardner, J. W. (2015) Development of a low-cost NDIR system for ppm detection of carbon dioxide in exhaled breath analysis. Procedia Engineering, 120 . pp. 388-391. doi:10.1016/j.proeng.2015.08.648 ISSN 1877-7058.
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Official URL: http://dx.doi.org/10.1016/j.proeng.2015.08.648
Abstract
The composition of exhaled breath contains important information regarding the health of our body. Measurements of the level of exhaled carbon dioxide can help both diagnose respiratory diseases and determine metabolic rate. A low-cost NDIR sensor has been developed that offers the detection of CO2 from the ppm range up to 5% level in human breath. An innovative lock-in amplifier system allows a 10 Hz drive signal to be recovered from the high frequency noise associated with a silicon thermopile infra-red detector. Laboratory experiments have demonstrated excellent stability (±0.10% in 25% RH) and repeatability between dry and humid conditions (±1.2% for 25% humidity increase). The response time is typically 2.4s, limited by the low drive frequency necessary for the MEMS-based wideband infra-red source. The current system has a resolution of ca. 10 ppm of CO2. Further refinement in signal processing and a higher drive frequency should permit even lower concentrations of CO2 to be detected with an ultimate target of 1 ppm. Existing performance has been shown to be suitable for breath analysis using a side-stream analyser.
Item Type: | Journal Article | ||||
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Subjects: | R Medicine > R Medicine (General) | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||
Library of Congress Subject Headings (LCSH): | Carbon dioxide -- Measurement, Breath tests, Respiratory organs -- Diseases -- Diagnosis, Gases -- Analysis, Metabolism | ||||
Journal or Publication Title: | Procedia Engineering | ||||
Publisher: | Elsevier | ||||
ISSN: | 1877-7058 | ||||
Official Date: | 11 September 2015 | ||||
Dates: |
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Volume: | 120 | ||||
Page Range: | pp. 388-391 | ||||
DOI: | 10.1016/j.proeng.2015.08.648 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Open Access (Creative Commons) |
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