Remote Sensing of Atmospheric Methane with IR OPO Lidar System

A differential absorption lidar (DIAL) system designed on the basis of optical parametric oscillators (OPO) with nonlinear KTiOAsO4 (KTA) and KTiOPO4 (KTP) crystals is described. The crystals allow laser radiation tuning in the infrared region (IR) wavelength region. The measurements in the 3.30–3.5...

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Bibliographic Details
Published in:Atmosphere 2020-01, Vol.11 (1), p.70
Main Authors: Yakovlev, Semyon, Sadovnikov, Sergey, Kharchenko, Olga, Kravtsova, Natalya
Format: Article
Language:English
Subjects:
Absorption
Absorption bands
Absorption spectra
Aerosols
Atmosphere
Atmospheric methane
Backscattering
Carbon dioxide
Crystals
dial
Differential absorption lidar
Experiments
Gases
Infrared radiation
ir lidar
Laboratories
Laser radiation
Lasers
Lidar
Measurement techniques
Methane
Optical Parametric Oscillators
Oscillators
Parametric amplifiers
Potassium titanyl orthophosphate
Radiation
Remote sensing
Spatial discrimination
Spatial resolution
Wavelength
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Description
Summary:A differential absorption lidar (DIAL) system designed on the basis of optical parametric oscillators (OPO) with nonlinear KTiOAsO4 (KTA) and KTiOPO4 (KTP) crystals is described. The crystals allow laser radiation tuning in the infrared region (IR) wavelength region. The measurements in the 3.30–3.50 μm spectral range, which includes a strong absorption band of methane, are carried out. Lidar backscattered signals in the spectral band 3.30–3.50 μm has been measured and analyzed along the horizontal path in the atmosphere. Based on the experimental results, CH4 concentrations ~2.085 ppm along a 800 m surface path are retrieved in the spectral range under study with a spatial resolution of 100 m.
ISSN:2073-4433
2073-4433
DOI:10.3390/atmos11010070