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Remote Sens. 2018, 10(2), 289; https://doi.org/10.3390/rs10020289

Optimized Spectrometers Characterization Procedure for Near Ground Support of ESA FLEX Observations: Part 1 Spectral Calibration and Characterisation

1
CETAL, Photonic Investigations Laboratory, National Institute for Laser, Plasma and Radiation Physics, Măgurele 77125, Romania
2
School of Geosciences, University of Edinburgh, Edinburgh EH9 3FF, UK
3
Remote Sensing Laboratories, Department of Geography, University of Zurich, 8057 Zurich, Switzerland
4
Rutherford Appleton Laboratory Space Science and Technology Department, Harwell Campus, Didcot, Oxfordshire OX11 0QX, UK
*
Author to whom correspondence should be addressed.
Received: 31 December 2017 / Revised: 3 February 2018 / Accepted: 10 February 2018 / Published: 13 February 2018
(This article belongs to the Special Issue Recent Progress and Developments in Imaging Spectroscopy)
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Abstract

The paper presents two procedures for the wavelength calibration, in the oxygen telluric absorption spectral bands (O2-A, λc = 687 nm and O2-B, λc = 760.6 nm), of field fixed-point spectrometers used for reflectance and Sun-induced fluorescence measurements. In the first case, Ne and Ar pen-type spectral lamps were employed, while the second approach is based on a double monochromator setup. The double monochromator system was characterized for the estimation of errors associated with different operating configurations. The proposed methods were applied to three Piccolo Doppio-type systems built around two QE Pros and one USB2 + H16355 Ocean Optics spectrometers. The wavelength calibration errors for all the calibrations performed on the three spectrometers are reported and potential methodological improvements discussed. The suggested calibration methods were validated, as the wavelength corrections obtained by both techniques for the QE Pro designed for fluorescence investigations were similar. However, it is recommended that a neon emission line source, as well as an argon or mercury-argon source be used to have a reference wavelength closer to the O2-B feature. The wavelength calibration can then be optimised as close to the O2-B and O2-A features as possible. The monochromator approach could also be used, but that instrument would need to be fully characterized prior to use, and although it may offer a more accurate calibration, as it could be tuned to emit light at the same wavelengths as the absorption features, it would be more time consuming as it is a scanning approach. View Full-Text
Keywords: ESA Fluorescence Explorer (FLEX) mission; field fixed-point spectrometers; oxygen telluric absorption lines; Sun-induced fluorescence; wavelength calibration ESA Fluorescence Explorer (FLEX) mission; field fixed-point spectrometers; oxygen telluric absorption lines; Sun-induced fluorescence; wavelength calibration
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Mihai, L.; Mac Arthur, A.; Hueni, A.; Robinson, I.; Sporea, D. Optimized Spectrometers Characterization Procedure for Near Ground Support of ESA FLEX Observations: Part 1 Spectral Calibration and Characterisation. Remote Sens. 2018, 10, 289.

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