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. Author manuscript; available in PMC: 2013 Feb 12.
Published in final edited form as: Anal Chim Acta. 2012 Jun 12;738:69–75. doi: 10.1016/j.aca.2012.06.002

Fig. 1.

Fig. 1

Schematic of the T-shaped chamber (L = 75, H = 50 and D = 18 mm) and thermocouple (TC) placed inside. A Macor piece is holding the sensor prior to deposition of a tungsten oxide (WO3) film onto interdigitated Pt electrodes laid on an Al2O3 substrate along with a resistance temperature detector (RTD) on the front side and a Pt heater on its back. (b) Schematic of the experimental set-up during breath analysis. The breath flow (grey lines) is controlled by the mask and kept constant by the PTR-MS pump. All the data (dashed lines) are collected and analyzed by the computer.