Remote sensing of methane in the atmosphere by the OPO lidar system in 3.30–3.43 μm spectral range

O. A. Romanovskii; Ya. O. Romanovskii; S. A. Sadovnikov; O. V. Kharchenko; S. V. Yakovlev

doi:10.1117/12.2532111

9 October 2019 Remote sensing of methane in the atmosphere by the OPO lidar system in 3.30–3.43 μm spectral range

O. A. Romanovskii, Ya. O. Romanovskii, S. A. Sadovnikov, O. V. Kharchenko, S. V. Yakovlev

Proceedings Volume 11152, Remote Sensing of Clouds and the Atmosphere XXIV; 1115211 (2019) https://doi.org/10.1117/12.2532111
Event: SPIE Remote Sensing, 2019, Strasbourg, France

Abstract

A series of laboratory experiments out to measure the absorption of the OPO laser radiation by methane as part of a calibrated CH₄: N₂ molecular mixture in a gas cell has been carried. The experiments were carried out in the spectral range of 3.30–3.43 μm, in which there is a fairly strong absorption band of methane and there is no interfering absorption by water vapor and carbon dioxide. The results of measuring the absorption of laser radiation at selected sensing wavelengths and their comparison with the calculated data are presented. Using the developed OPO-lidar system, backscattered signals were received and processed in the range of the spectrum of 3.30–3.43 μm for the horizontal route of atmospheric sensing. Based on the experimental data obtained, the absorption coefficients were estimated and the CH₄ concentrations were restored in the spectral range under study at a 800 m atmospheric path with a spatial resolution of 100 m.

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O. A. Romanovskii, Ya. O. Romanovskii, S. A. Sadovnikov, O. V. Kharchenko, and S. V. Yakovlev "Remote sensing of methane in the atmosphere by the OPO lidar system in 3.30–3.43 μm spectral range", Proc. SPIE 11152, Remote Sensing of Clouds and the Atmosphere XXIV, 1115211 (9 October 2019); https://doi.org/10.1117/12.2532111

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KEYWORDS

Methane

Absorption

Atmospheric sensing

Optical parametric oscillators

LIDAR

Remote sensing

Atmospheric laser remote sensing

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