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A NDIR Mid-Infrared Methane Sensor with a Compact Pentahedron Gas-Cell
Open AccessArticle

Broadband Time-Resolved Absorption and Dispersion Spectroscopy of Methane and Ethane in a Plasma Using a Mid-Infrared Dual-Comb Spectrometer

Trace Gas Research Group, Department of Molecular and Laser Physics, Institute of Molecules and Materials, Radboud University, 6525 AJ Nijmegen, The Netherlands
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Sensors 2020, 20(23), 6831; https://doi.org/10.3390/s20236831
Received: 10 September 2020 / Revised: 25 November 2020 / Accepted: 26 November 2020 / Published: 29 November 2020
(This article belongs to the Special Issue Mid-Infrared Laser Based Sensors)
Conventional mechanical Fourier Transform Spectrometers (FTS) can simultaneously measure absorption and dispersion spectra of gas-phase samples. However, they usually need very long measurement times to achieve time-resolved spectra with a good spectral and temporal resolution. Here, we present a mid-infrared dual-comb-based FTS in an asymmetric configuration, providing broadband absorption and dispersion spectra with a spectral resolution of 5 GHz (0.18 nm at a wavelength of 3333 nm), a temporal resolution of 20 μs, a total wavelength coverage over 300 cm−1 and a total measurement time of ~70 s. We used the dual-comb spectrometer to monitor the reaction dynamics of methane and ethane in an electrical plasma discharge. We observed ethane/methane formation as a recombination reaction of hydrocarbon radicals in the discharge in various static and dynamic conditions. The results demonstrate a new analytical approach for measuring fast molecular absorption and dispersion changes and monitoring the fast dynamics of chemical reactions over a broad wavelength range, which can be interesting for chemical kinetic research, particularly for the combustion and plasma analysis community. View Full-Text
Keywords: dual frequency comb spectroscopy; mid-infrared absorption and dispersion spectroscopy; electrical discharge plasma; time-resolved plasma kinetics dual frequency comb spectroscopy; mid-infrared absorption and dispersion spectroscopy; electrical discharge plasma; time-resolved plasma kinetics
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MDPI and ACS Style

Abbas, M.A.; Dijk, L.v.; Jahromi, K.E.; Nematollahi, M.; Harren, F.J.M.; Khodabakhsh, A. Broadband Time-Resolved Absorption and Dispersion Spectroscopy of Methane and Ethane in a Plasma Using a Mid-Infrared Dual-Comb Spectrometer. Sensors 2020, 20, 6831. https://doi.org/10.3390/s20236831

AMA Style

Abbas MA, Dijk Lv, Jahromi KE, Nematollahi M, Harren FJM, Khodabakhsh A. Broadband Time-Resolved Absorption and Dispersion Spectroscopy of Methane and Ethane in a Plasma Using a Mid-Infrared Dual-Comb Spectrometer. Sensors. 2020; 20(23):6831. https://doi.org/10.3390/s20236831

Chicago/Turabian Style

Abbas, Muhammad A.; Dijk, Luuk v.; Jahromi, Khalil E.; Nematollahi, Mohammadreza; Harren, Frans J.M.; Khodabakhsh, Amir. 2020. "Broadband Time-Resolved Absorption and Dispersion Spectroscopy of Methane and Ethane in a Plasma Using a Mid-Infrared Dual-Comb Spectrometer" Sensors 20, no. 23: 6831. https://doi.org/10.3390/s20236831

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