Dr. Laurent Vial Profile

Dr. Laurent Vial

at LYNRED

SPIE Involvement:

Author

Publications (8)

Proceedings Article | 12 July 2023 Open Access

Results of the METimage HgCdTe flight photodetector test campaign

Rémi Rivière, Klaus-Werner Kruse, Henrique Candeias, Laurent Vial, Céline Riuné, Michael Skegg, Olivier Saint-Pé

Proceedings Volume 12777, 127773R (2023) https://doi.org/10.1117/12.2690563

KEYWORDS: Compliance, Photodetectors, Mercury cadmium telluride, Surface plasmons, Performance modeling, Astronomical imaging, Signal detection, Short wave infrared radiation, Equipment, Interference (communication)

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The METimage instrument is an Airbus-primed passive superspectral imaging radiometer measuring thermal radiance emitted by the Earth and solar backscattered radiation in 20 spectral channels from 0.44µm to 13.35µm. The instrument achieves the entire Earth coverage at a low-Earth polar-orbit on daily basis by constantly scanning with spatial resolution of 500m at nadir and constant spatial sampling angle (SSA) across a 2670km swath. In the thermal domain, the most crucial part of the system is the pair of cryogenically-cooled HgCdTe (MCT) photodetectors intended for thermal-domain SMWIR and LVWIR, the development and manufacturing of which was contracted to LYNRED, who have successfully delivered the flight models to Airbus. In this work, the results of the Airbus-hosted flight detection-chain level test campaign in nominal vacuum and cryogenic environment are presented. Their system impacts are evaluated to conclude the expected full flight-worthiness of both delivered photodetectors into the METimage optical payload. First, both dark currents and offsets are characterized: both parameter noise levels quantitatively outperform their predicted values, minimizing their impact on the system signal-to-noise ratio (SNR). Then the response linearity of both photodetectors over the required thermal radiance ranges has been measured and has shown better performances than predicted by design over the setup-accessible solar and 185K to 280K thermal radiance ranges. Finally, the random telegraph signal (RTS) signature of both photodetectors is thoroughly characterized based on a novel sharp-edge detection method in conditions mimicking in-orbit operation: after periodic cooldowns and at stable nominal temperatures. Based on these measurements, the sub-pixel selection map (SPSM) is generated, enabling to deselect image elements that are deemed to degrade overall performance from a system perspective. Thanks to a demanding flight model selection procedure applied by LYNRED, the RTS test results of the sorted out devices are significantly better than expected, hence ensuring compliance for system SNR and homogeneity. Full flight worthiness is therefore confirmed and final integration of both photodetectors in the first METimage flight instrument optical system is currently ongoing. Additional presentation content can be accessed on the supplemental content page.

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Proceedings Article | 14 December 2016 Paper

Space activity and programs at Sofradir

A. Bouakka-Manesse, N. Jamin, A. Delannoy, B. Fièque, C. Leroy, P. Pidancier, L. Vial, P. Chorier, N. Péré Laperne

Proceedings Volume 10000, 100000N (2016) https://doi.org/10.1117/12.2241789

KEYWORDS: Sensors, Infrared detectors, Visible radiation, Short wave infrared radiation, Neptune, Readout integrated circuits, Saturn, Retina, Mars, Infrared sensors

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Proceedings Article | 19 September 2016 Paper

Space activity and programs at SOFRADIR

A. Bouakka-Manesse, N. Jamin, A. Delannoy, B. Fieque, C. Leroy, P. Pidancier, L. Vial, P. Chorier, N. Péré-Laperne

Proceedings Volume 9981, 998109 (2016) https://doi.org/10.1117/12.2240657

KEYWORDS: Sensors, Infrared detectors, Visible radiation, Short wave infrared radiation, Neptune, Readout integrated circuits, Retina, Saturn, Infrared sensors, Mars

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Proceedings Article | 9 October 2008 Paper

Latest results of SOFRADIR MCT technology for space applications

L. Vial, P. Chorier, O. Gravrand

Proceedings Volume 7106, 71061L (2008) https://doi.org/10.1117/12.801075

KEYWORDS: Sensors, Infrared detectors, Staring arrays, Aerospace engineering, Antireflective coatings, Short wave infrared radiation, Standards development, Visible radiation, Infrared sensors, Satellites

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Proceedings Article | 29 October 2007 Paper

Shack-Hartmann wavefront sensor using IR extended source

Clélia Robert, Bruno Fleury, Vincent Michau, Jean-Marc Conan, Luc Veyssiere, Serge Magli, Laurent Vial

Proceedings Volume 6747, 67470H (2007) https://doi.org/10.1117/12.738296

KEYWORDS: Wavefront sensors, Adaptive optics, Sensors, Infrared sensors, Infrared imaging, Microlens array, Staring arrays, Mid-IR, Atmospheric turbulence, Spatial resolution

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Proceedings Article | 5 October 2006 Paper

Latest developments on MCT staring arrays

Laurent Vial, Agnes Combette, David Gohier, Frédéric Pistone, Philippe Tribolet, Michel Vuillermet, Gérard Destefanis

Proceedings Volume 6395, 63950E (2006) https://doi.org/10.1117/12.689672

KEYWORDS: Staring arrays, Nonuniformity corrections, Sensors, Mercury cadmium telluride, Jupiter, Modulation transfer functions, Semiconducting wafers, Optical transfer functions, Germanium, Infrared detectors

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Proceedings Article | 17 May 2006 Paper

Bi-color and dual-band HgCdTe infrared focal plane arrays at DEFIR

G. Destefanis, P. Ballet, J. Baylet, P. Castelein, O. Gravrand, J. Rothman, F. Rothan, G. Perrais, J.P. Chamonal, A. Million, P. Tribolet, B. Terrier, E. Sanson, P. Costa, L. Vial

Proceedings Volume 6206, 62060R (2006) https://doi.org/10.1117/12.669108

KEYWORDS: Staring arrays, Mid-IR, Diodes, Sensors, Long wavelength infrared, Mercury cadmium telluride, Indium, Etching, Photodiodes, Infrared radiation

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Proceedings Article | 9 February 2001 Paper

Instruments and system for CLOUDS: a cloud and radiation monitoring satellite

Bizzarro Bizzarri, Paolo Spera, Emanuele Maggi, Peter Coppo, Roberto Bonsignori, Peter Zimmermann, Thomas Rose, Norman Grant, Laurent Vial

Proceedings Volume 4169, (2001) https://doi.org/10.1117/12.417133

KEYWORDS: Clouds, Radiometry, Sensors, Satellites, Calibration, Polarization, Climatology, Data storage, Medium wave, Ultraviolet radiation

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