AI Article Synopsis
- A new near-infrared laser heterodyne radiometer (LHR) was developed to measure atmospheric CO levels using a tunable diode laser as a local oscillator.
- High-resolution spectral data in the range of 6248.5-6256 cm helped calculate the column-averaged dry-air mixing ratio of CO in Dunkirk, France, yielding a result consistent with other data sources.
- This innovative LHR shows promise for creating advanced, unattended atmospheric sensors for both spacecraft and ground-based applications, with improved channel selection capabilities for better data inversion.
Article Abstract
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) LHR spectra in the spectral region of 6248.5-6256 cm were recorded for the observation of atmospheric CO. 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 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.
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| http://dx.doi.org/10.1364/OE.482131 | DOI Listing |
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