Instrument predevelopment activities for FLEX mission

Coppo, P.; Pettinato, L.; Nuzzi, Davide; Fossati, Enrico; Taiti, A.; Gabrieli, Riccardo; Campa, Annamaria; Taccola, Matteo; Bézy, Jean‐Loup; François, M.; Erdmann, Lars; Triebel, Peter; Lehr, Dennis

doi:10.1117/1.oe.58.7.075102

Cited by 7 publications

(9 citation statements)

References 14 publications

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“…For example, NASA's VIIRS (Visible/Infrared Imager/RadiometerSuite's) obtains the polarization response of the remote sensor at different polarization angles, and then calculates the polarization sensitivity of the remote sensor [11] . The high-resolution fluorescence imaging spectrometer (FLORIS) developed by ESA also uses linearly polarized light for polarization sensitivity testing, and generates linearly polarized light through a stable and uniform light source combined with a polarizer [12] . The OCI (OceanColor Instrument) developed by NASA and Montana State University in the United States used an integrating sphere light source system to generate linearly polarized light through linear polarizers to complete polarization sensitivity testing when comparing the polarization responses of six hyperspectral imagers [13][14] .…”

Section:   mentioning

confidence: 99%

Analysis of the key techniques in polarization feature extraction and correction

Cui,

Zhang,

Liu

et al. 2023

AOPC 2023: Optical Spectroscopy and Imaging; And Atmospheric and Environmental Optics

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Section:   mentioning

confidence: 99%

Analysis of the key techniques in polarization feature extraction and correction

Cui,

Zhang,

Liu

et al. 2023

AOPC 2023: Optical Spectroscopy and Imaging; And Atmospheric and Environmental Optics

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“…This is essential for an innovative high spectral resolution spectrometer, like FLORIS, devoted to the measurement of the vegetation fluorescence, where optical performances as spectral resolution, image quality, polarization sensitivity, distortions and Stray-Light (SL) are of fundamental importance for the retrieval of the weak fluorescence signals emitted from vegetation within the total reflected and the atmospheric scattering contributions. To this scope a breadboard of the FLORIS instrument, including the optical bench, the telescope and the two HR and LR spectrometers, was built and tested in previous phases A-B1-B2 [8], [9]. An engineering model, called Optical Model Refurbished (OMR), for the High Resolution channel has been built in phases C-D, with the primary aim of improving the SL measurements and the SL-model correlation by an accurate validation of the end-to-end SL correction strategy, but also that of completing the performance measurements, allowing also tests in vacuum conditions.…”

Section: Icso 2022 International Conference On Space Opticsmentioning

confidence: 99%

Improving stray-light characterization beyond blooming: the experience of the FLORIS Optical Model Refurbished

Nuzzi¹,

Pettinato²,

Fossati³

et al. 2023

International Conference on Space Optics — ICSO 2022

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The FLuorescence EXplorer (FLEX) European Space Agency (ESA) mission with its payload, the FLuORescence Imaging Spectrometer (FLORIS), aims at performing quantitative measurements of the solar induced chlorophyll fluorescence from space, with the purpose of improving the monitoring of the health of Earth vegetation. The retrieval of a faint signal, such as the one from chlorophyll fluorescence, requires very low Stray-Light (SL) levels. The SL reduction in FLORIS implied constraints impacting the design, by means of using low roughness optical components, the integration, through a strict contamination control, but also the data processing with the need of a very accurate correction strategy making use of numerical models well correlated with experimental data, to be acquired during the On Ground Calibration (OGC) activities. In order to assess and validate the correction strategy, an accurate SL characterization has been anticipated during the FLORIS Optical Model Refurbished (OMR) campaign. Different methods, such as out-of-field and out-of-band measurements, have been investigated in order to avoid the detector blooming affecting measurements with high input signals. By combining the results from the different approaches, it has been possible to achieve up to 9-10 decades of explored dynamic range. The model, correlated with measurements, has finally proved to be capable to correct SL with a reduction factor >10, down to a level less than 40% of the required fluorescence error (10% of a fluorescence level of about 2 mW/m²/sr/nm).

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“…We choose the number of 4 different trap species; this translates into a total of 9 free parameters. The exact same calibration procedure was repeated with 3 3. Optimal set of parameters resulting from the described calibration procedure and the possible corresponding trap species (see 4 for a more complete overview and discussion of trap species).…”

Section: Calibration Of the Cte Modelmentioning

confidence: 99%

“…Both spectrometers have CCDs in their focal planes. 2,3 As reported for a number of ESA missions using CCDs either in operation or currently in development (e.g., Sentinel-4, 4 Sentinel-5, HST, 5 XMM, Gaia, [6][7][8] Euclid, [9][10][11] ), radiation effects may significantly impact their scientific performance if not properly studied and accounted for in the data processing. Indeed high-energy particles impacting the detectors result in the creation of CCD silicon lattice defects.…”

Section: Introductionmentioning

confidence: 99%

Proton-induced degradation of charge transfer efficiency on FLEX CCD detectors: measurement and impact on instrument performances

Bernard¹,

Arko²,

Prod’homme³

et al. 2021

International Conference on Space Optics — ICSO 2020

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The exposure of Charge-Coupled Devices (CCD) to high-energy particles in space leads to a degradation of their performances. One of the observed mechanisms is the creation of defects in the CCD silicon lattice by displacement damage, inducing a reduction of the Charge Transfer Efficiency (CTE), i.e. the ability of the device to efficiently transfer the photo-induced charge to the read-out output node. Hence a reduction of the imaging quality of the detector. We present here a comparison of the modelled and measured optical quality of the FLEX CCD exposed to a high energy proton flux. The optical quality was directly measured on an irradiated flight representative device. A physical model of the detector, including an accurate modelling of the charge trapping dynamic, is used to generate synthetic scenes affected by CTE degradation from which the optical quality is assessed and compared to the measurement. Eventually the correlation of the model and the measurement will allow to accurately assess the performances of a detector exposed to space radiation environment.

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Instrument predevelopment activities for FLEX mission

Cited by 7 publications

References 14 publications

Analysis of the key techniques in polarization feature extraction and correction

Analysis of the key techniques in polarization feature extraction and correction

Improving stray-light characterization beyond blooming: the experience of the FLORIS Optical Model Refurbished

Proton-induced degradation of charge transfer efficiency on FLEX CCD detectors: measurement and impact on instrument performances

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