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. 2019 Jul 20;19(14):3202. doi: 10.3390/s19143202

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© 2019 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 (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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PAS signal with an optimum modulation depth of 0.297 cm⁻¹. (a) 2f signal with different CO concentrations. (b) Signal peak value as a function of concentration.