@article{b2a12fbadb544026a0784e02fc0cf0e6,
title = "Methane photo-acoustic gas analyzer based on 7.7-μm quantum cascade laser",
abstract = "The photo-acoustic (PA) methane gas analyzer based on a quantum cascade laser (QCL; ~7.7 μm/1800 Hz/24 mW), a resonant differential PA detector, and a sealed gas-filled cell was investigated. The measurement of methane concentration below the background value in the air (~0.3 ppm CH4) is shown, the standard dispersion was (1σ) ≈ (10–11) ppb CH4 with an integration time of 10 s. Under conditions of temperature instability (or emission wavelength) of QCL when normalized to a gas-filled cell, the relative measurement error of the CH4 concentration does not exceed 3%. A decrease in the average QCL radiation power (~24–12–6 mW) leads to a noticeable deterioration in the threshold sensitivity of the PA gas analyzer. It is recommended to increase the average QCL power level to ~50 mW. The dynamic range of measuring the concentration of methane of the PA gas analyzer in the linear mode was ~4 decades (from 0.3 ppm to 2000–3000 ppm CH4).",
keywords = "Methane, Photo-acoustic gas analyzer, Quantum-cascade laser, Resonant differential photo-acoustic detector",
author = "Sherstov, {I. V.} and Kolker, {D. B.} and Boyko, {A. A.} and Vasiliev, {V. A.} and Pustovalova, {R. V.}",
note = "Funding Information: The authors are sincerely grateful to A.V. Pavlyuk, N.Yu. Kostyukova, E.Yu. Erushin (all - Novosibirsk State University, Novosibirsk) for the assistance in the experiments. The work was carried out within the framework of the project of the National Technological Initiative ?Development and creation of a breakthrough complex for geophysical exploration using UAV? (?Aerotomography?), and also partially with the financial support of the Russian Science Foundation grant 17-72-30006. Funding Information: The work was carried out within the framework of the project of the National Technological Initiative “Development and creation of a breakthrough complex for geophysical exploration using UAV” (“Aerotomography”), and also partially with the financial support of the Russian Science Foundation grant 17-72-30006 . Publisher Copyright: {\textcopyright} 2021 Elsevier B.V. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.",
year = "2021",
month = sep,
doi = "10.1016/j.infrared.2021.103858",
language = "English",
volume = "117",
journal = "Infrared Physics and Technology",
issn = "1350-4495",
publisher = "Elsevier",
}