Articles | Volume 12, issue 1
https://doi.org/10.5194/jsss-12-37-2023
https://doi.org/10.5194/jsss-12-37-2023
Regular research article
 | 
25 Jan 2023
Regular research article |  | 25 Jan 2023

Resonant photoacoustic cells for laser-based methane detection

Katrin Schmitt, Mara Sendelbach, Christian Weber, Jürgen Wöllenstein, and Thomas Strahl

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Cited articles

Baumann, B., Kost, B., Wolff, M., and Groninga, H.: Modeling and numerical investigation of photoacoustic resonators, INTECH Open Access Publisher, 17–38. doi10.5772/6798, 2008. 
Baumann, B., Kost, B., Groninga, H., and Wolff, M.: Eigenmode analysis of photoacoustic sensors via finite element method. Rev. Sci. Instrum., 77, 044901, https://doi.org/10.1063/1.2186808, 2006. 
Bozóki, Z., Pogány, A., and Szabó, G.: Photoacoustic Instruments for Practical Applications: Present, Potentials, and Future Challenges, Appl. Spectrosc. Rev., 46, 1–37, https://doi.org/10.1080/05704928.2010.520178, 2011. 
Dong, L., Tittel, F. K., Li, C., Sanchez, N. P., Wu, H., Zheng, C., Yu, Y., Sampaolo, A., and Griffin, R. J.: Compact TDLAS based sensor design using interband cascade lasers for mid-IR trace gas sensing, Opt. Expr., 24, A528–A535, https://doi.org/10.1364/OE.24.00A528, 2016. 
Dumitras, D. C., Dutu, D. C., Matei, C., Magureau, A. M., Petrus, M., and Popa, C.: Laser photoacoustic spectroscopy: principles, instrumentation, and characterization, J. Optoelectron. Adv. Mat., 9, 12, 3655–3701, WOS:000251768700001, 2007. 
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Short summary
We present a photoacoustic sensor enabling fast, inexpensive, and highly sensitive methane detection in environmental monitoring applications. Six different T-cell designs were both theoretically and experimentally investigated. The aim was to understand the photoacoustic signal generation and resonances in relation to the different cell geometries, and determine the long-term stability and the detection limits for methane. These were below the methane background concentration in air of 1.8 ppm.