TY - JOUR

T1 - Methane photo-acoustic gas analyzer based on 7.7-μm quantum cascade laser

AU - Sherstov, I. V.

AU - Kolker, D. B.

AU - Boyko, A. A.

AU - Vasiliev, V. A.

AU - Pustovalova, R. V.

N1 - 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: © 2021 Elsevier B.V. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/9

Y1 - 2021/9

N2 - 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).

AB - 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).

KW - Methane

KW - Photo-acoustic gas analyzer

KW - Quantum-cascade laser

KW - Resonant differential photo-acoustic detector

UR - http://www.scopus.com/inward/record.url?scp=85111895099&partnerID=8YFLogxK

UR - https://elibrary.ru/item.asp?id=46996190

U2 - 10.1016/j.infrared.2021.103858

DO - 10.1016/j.infrared.2021.103858

M3 - Article

AN - SCOPUS:85111895099

VL - 117

JO - Infrared Physics and Technology

JF - Infrared Physics and Technology

SN - 1350-4495

M1 - 103858

ER -