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Article Dans Une Revue Optics Express Année : 2023

External-cavity diode laser-based near-infrared broadband laser heterodyne radiometer for remote sensing of atmospheric CO 2

Résumé

A near-infrared broadband (1500–1640 nm) laser heterodyne radiometer (LHR) with a tunable external-cavity diode laser as the local oscillator is developed and the relative transmittance, which represents the absolute relationship between the measured spectral signals and the atmospheric transmittance, is derived. High-resolution (0.0087 cm -1 ) LHR spectra in the spectral region of 6248.5–6256 cm −1 were recorded for the observation of atmospheric CO 2 . Combined with the relative transmittance, the preprocessed measured LHR spectra, the optimal estimation method, and the Python scripts for computational atmospheric spectroscopy, the column-averaged dry-air mixing ratio of CO 2 of 409.09 ± 8 ppmv in Dunkirk, France on February 23, 2019, was retrieved, which is consistent with GOSAT and TCCON data. The near-infrared external-cavity LHR demonstrated in the present work has a high potential for use in developing a robust, broadband, unattended, and all-fiber LHR for spacecraft and ground-based atmospheric sensing that offers more channel selection for inversion.

Dates et versions

hal-04025880 , version 1 (13-03-2023)

Identifiants

Citer

Jingjing Wang, Tan Tu, Feng Zhang, Fengjiao Shen, Jian Xu, et al.. External-cavity diode laser-based near-infrared broadband laser heterodyne radiometer for remote sensing of atmospheric CO 2. Optics Express, 2023, 31 (6), pp.9251. ⟨10.1364/OE.482131⟩. ⟨hal-04025880⟩
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