23 September 2009 A visible and NIR multilinear array dedicated to Sentinel 2 Multi Spectral Imager
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Abstract
Sentinel 2 is an EU/ESA LEO Earth observation mission currently developed in the framework of Global Measurement Environment and Security (GMES) program. The associated Multi Spectral Imager instrument is equipped with about 230 mm length VNIR and SWIR Focal Plane Arrays, each one being made of twelve detectors mechanically butted in staggered configuration. Each elementary VNIR detector features tens spectral bands with 10m, 20m or 60m spatial sampling, ranging from about 430 to 900 nm. The devices are currently manufactured using a 0.35 μm CMOS process optimised for imaging application and already space qualified, thanks to Astrium COBRA family development. For each spectral band, minimum SNR corresponding to reference flux and maximum integration time is required. Maximum flux and minimum MTF are also specified. The photo detector charge to voltage conversion factors and geometrical shapes have therefore been adjusted band per band in order to meet all these competing specifications. In addition, a per pixel Correlated Double Sampling readout circuit has been implemented to cancel photodiode reset noise, providing mean total readout noise lower than 200μV, and the output voltage swing has been improved in view of maximizing the device dynamics. Black coating has been deposited between the simple or double lines of photo detectors in order minimizing straight light effects. After a description of the multi linear detector architecture and functionality, its main performances will be presented. The current status of the industrial development will also be depicted.
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Michel Bréart de Boisanger, Olivier Saint-Pé, Franck Larnaudie, Saïprasad Guiry, Pierre Magnan, Philippe Martin-Gonthier, Franck Corbière, Neil Guyatt, "A visible and NIR multilinear array dedicated to Sentinel 2 Multi Spectral Imager", Proc. SPIE 7474, Sensors, Systems, and Next-Generation Satellites XIII, 74741A (23 September 2009); doi: 10.1117/12.834351; https://doi.org/10.1117/12.834351
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