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. 2013 Jan 2;13(1):535–549. doi: 10.3390/s130100535

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© 2013 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 2. — Setup for photoacoustic measurements: QCL = quantum cascade laser, FM = flipping mirror, L = lens, I = Iris, DL = diode laser (for alignment tasks), Chop = chopper, PM = power meter, Mic= microphone and RH-T = relative humidity-temperature sensor.