The Concentration Measurement of Hydrogen Molecules in the Atmosphere: Lidar Equation Computer Simulation for the Differential Absorption and Scattering

The article discusses the concerns of improving the accuracy of lidar measurements of the concentration of hydrogen molecules in the atmosphere. A computer simulation of the lidar equation was performed for differential light absorption and scattering by hydrogen molecules during vertical sensing of...

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Bibliographic Details
Published in:Measurement techniques 2023-02, Vol.65 (11), p.827-833
Main Authors: Privalov, V. E., Shemanin, V. G.
Format: Article
Language:English
Subjects:
Absorption spectra
Analytical Chemistry
Characterization and Evaluation of Materials
Computer simulation
Computer-generated environments
Electromagnetic absorption
Emitters
Error analysis
Hydrogen
Lasers
Lidar
Measurement
Measurement Science and Instrumentation
Optical radar
Physical Chemistry
Physics
Physics and Astronomy
Remote sensing
Scattering
Simulation
Simulation methods
Two-wavelength lasers
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Summary:The article discusses the concerns of improving the accuracy of lidar measurements of the concentration of hydrogen molecules in the atmosphere. A computer simulation of the lidar equation was performed for differential light absorption and scattering by hydrogen molecules during vertical sensing of the atmosphere to a height of up to 1500 m taking into account the ratio of the halfwidths of the lasing lines and the function of the lidar apparatus. The article presents the optical scheme of a differential absorption and scattering lidar with a two-wavelength laser emitter; one wavelength of its radiation coincides with the maximum wavelength of the absorption band of the molecule under study, while the other wavelength is outside this band. Using computer simulation, it is demonstrated that the relative error in measuring the lidar signal of differential absorption and scattering when sensing hydrogen molecules in the atmosphere decreases sharply at a sensing distance of less than 50 m. At a sensing distance of more than 800 m, the relative error remains practically unchanged and does not exceed 0.02. The results obtained can be used to develop differential absorption and scattering lidars for sensing hydrogen molecules in the atmosphere.
ISSN:0543-1972
1573-8906
DOI:10.1007/s11018-023-02157-1