Pixelated filters for spatial imaging
| Autor: | Julien Lumeau, Isabelle Savin De Larclause, Michel Lequime, Laetitia Abel-Tiberini, Karine Mathieu, Jacques Berthon |
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| Přispěvatelé: | Centre National d'Études Spatiales [Toulouse] (CNES), RCMO (RCMO), Institut FRESNEL (FRESNEL), Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Lumeau, Julien |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Engineering
Pixel [SPI.OPTI] Engineering Sciences [physics]/Optics / Photonic business.industry Multispectral image Bandwidth (signal processing) Detector Rejection rate Dot pitch law.invention Metrology Optics law Electronic engineering [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic Photolithography business ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Optifab Optifab, Oct 2015, Rochester, United States. pp.963321 |
| Popis: | Small satellites are often used by spatial agencies to meet scientific spatial mission requirements. Their payloads are composed of various instruments collecting an increasing amount of data, as well as respecting the growing constraints relative to volume and mass; So small-sized integrated camera have taken a favored place among these instruments. To ensure scene specific color information sensing, pixelated filters seem to be more attractive than filter wheels. The work presented here, in collaboration with Institut Fresnel, deals with the manufacturing of this kind of component, based on thin film technologies and photolithography processes. CCD detectors with a pixel pitch about 30 μm were considered. In the configuration where the matrix filters are positioned the closest to the detector, the matrix filters are composed of 2x2 macro pixels (e.g. 4 filters). These 4 filters have a bandwidth about 40 nm and are respectively centered at 550, 700, 770 and 840 nm with a specific rejection rate defined on the visible spectral range [500 – 900 nm]. After an intense design step, 4 thin-film structures have been elaborated with a maximum thickness of 5 μm. A run of tests has allowed us to choose the optimal micro-structuration parameters. The 100x100 matrix filters prototypes have been successfully manufactured with lift-off and ion assisted deposition processes. High spatial and spectral characterization, with a dedicated metrology bench, showed that initial specifications and simulations were globally met. These excellent performances knock down the technological barriers for high-end integrated specific multi spectral imaging. |
| Databáze: | OpenAIRE |
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