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. 2014 Mar 28;14(4):6165–6206. doi: 10.3390/s140406165

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© 2014 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/http://creativecommons.org/licenses/by/3.0/).

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Figure 8. — Normalized experimental results (dots) of the QEPAS signals as a function of the vertical position of the QTF. Data are obtained by detecting a concentration of 2% H₂O in N₂ at 75 Torr and by using an on-beam QEPAS sensor system configuration. The solid line is the best fit curve obtained using Equation (3.21).