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. 2010 Jun 1;10(6):5469–5502. doi: 10.3390/s100605469

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© 2010 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 23. — Comparison of CO₂ Sensor Technologies: Commercial Senseair Infra-red device versus a barium based metal oxide semiconductor sensor developed at UCL. CO₂ concentration indicated by the K30 is plotted on right hand axis and the UCL sensor response is on left hand axis, showing a change in resistance in the MOhm region.