Quartz-enhanced photoacoustic spectroscopy of methane isotopologues

Marilena Giglio; Angelo Sampaolo; Pietro Patimisco; Davide Pinto; Giansergio Menduni; Arianna Elefante; Stefano Dello Russo; Fabrizio Sgobba; Andrea Zifarelli; Frank K. Tittel; Vincenzo Spagnolo

doi:10.1117/12.2578149

5 March 2021 Quartz-enhanced photoacoustic spectroscopy of methane isotopologues

Marilena Giglio, Angelo Sampaolo, Pietro Patimisco, Davide Pinto, Giansergio Menduni, Arianna Elefante, Stefano Dello Russo, Fabrizio Sgobba, Andrea Zifarelli, Frank K. Tittel, Vincenzo Spagnolo

Author Affiliations +

Proceedings Volume 11693, Photonic Instrumentation Engineering VIII; 116930I (2021) https://doi.org/10.1117/12.2578149
Event: SPIE OPTO, 2021, Online Only

Abstract

We report on the detection of the isotopologues ¹²CH₄ and ¹³CH₄ by employing a quartz-enhanced photoacoustic spectroscopy (QEPAS)-based sensor. By properly selecting the exciting light source and the working conditions, two absorption lines, having a negligible cross-section ratio temperature coefficient of -6.7‰/°C and a cross section ratio of ~ 0.06 for a natural abundance of each isotope, can be targeted. The QEPAS signal of the two isotopologues was acquired for mixtures in nitrogen of methane in natural abundance in a wide range of concentrations (0.02%-20%) showing a non-linear trend with high concentrations and a constant ratio comparable with the cross-section.

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Marilena Giglio, Angelo Sampaolo, Pietro Patimisco, Davide Pinto, Giansergio Menduni, Arianna Elefante, Stefano Dello Russo, Fabrizio Sgobba, Andrea Zifarelli, Frank K. Tittel, and Vincenzo Spagnolo "Quartz-enhanced photoacoustic spectroscopy of methane isotopologues", Proc. SPIE 11693, Photonic Instrumentation Engineering VIII, 116930I (5 March 2021); https://doi.org/10.1117/12.2578149

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