Design and Modelling of a Portable Breath Analyser for Metabolic Rate Measurement

Article, Other ORP type English OPEN
Vincent, T.A. ; Wilson, A. ; Hattersley, J.G. ; Chappell, M.J. ; Gardner, J.W. (2014)
  • Publisher: Elsevier BV
  • Journal: Procedia Engineering, volume 87, pages 668-671 (issn: 1877-7058)
  • Related identifiers: doi: 10.1016/j.proeng.2014.11.576
  • Subject: Engineering(all) | RA

Breath-by-breath levels of O2 and CO2 may be used to determine human metabolic rate which, in turn, is related to the problem of obesity. A sensor system has been designed to not only monitor O2 and CO2 in breath, but also temperature, relative humidity (RH), volumetric flow-rate, and trace levels of CO. Our system targets energy expenditure measurements to within a 1% tolerance. A data driven modelling approach has been adopted to characterise the gas sensors at gas concentrations found in inhaled air and exhaled breath. Data were collected for model fitting from experiments performed on an automated gas testing rig. Bi-exponential curves were fitted to the sensor data using partial least squares (PLS) regression. These fits show that the O2 sensor functions close to the target accuracy, with a 95% confidence interval, whereas the CO2 sensor performs less well (70%). Development of a microcontroller interface combined with work on new low-power CMOS sensors will eventually lead to a miniature low-cost system for mobile phone application.\ud
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