The visible, near-infrared and short wave infrared channels of the EarthCARE multi-spectral imager
| Autor: | O. Marinescu, B.T.G. de Goeij, Rob Vink, J. Doornink, A. van ‘t Hof, E. W. Meijer, W.P. van Werkhoven |
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| Přispěvatelé: | TNO Industrie en Techniek |
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Infrared devices
Infrared Multispectral image Opto-mechanical design Optical radar Optics Calibration Solar radiation Direct solar radiation Performance requirements Radiometry Infrared radiation Spectroscopy Remote sensing instruments Remote sensing Physics Radiometer Instrument performance Industrial Innovation Stability requirements business.industry Detector Cloud profiling radar In-orbit calibrations Spectral bands Earth atmosphere Lidar Space & Scientific Instrumentation Satellite business |
| Zdroj: | Armandillo, E.Cugny, B.Karafolas, N., International Conference on Space Optics, ICSO 2010, 4-8 October 2010, Rhodes Island, Greece, 10565 |
| Popis: | The EarthCARE satellite mission objective is the observation of clouds and aerosols from low Earth orbit. The payload will include active remote sensing instruments being the W-band Cloud Profiling Radar (CPR) and the ATLID LIDAR. These are supported by the passive instruments Broadband Radiometer (BBR) and the Multispectral Imager (MSI) providing the radiometric and spatial context of the ground scene being probed. The MSI will form Earth images over a swath width of 150 km; it will image the Earth atmosphere in 7 spectral bands. The MSI instrument consists of two parts: the Visible, Near infrared and Short wave infrared (VNS) unit, and the Thermal InfraRed (TIR) unit. Subject of this paper is the VNS unit. In the VNS optical unit, the ground scene is imaged in four spectral bands onto four linear detectors via separate optical channels. Driving requirements for the VNS instrument performance are the spectral sensitivity including out-of-band rejection, the MTF, co-registration and the inter-channel radiometric accuracy. The radiometric accuracy performance of the VNS is supported by in-orbit calibration, in which direct solar radiation is fed into the instrument via a set of quasi volume diffusers. The compact optical concept with challenging stability requirements together with the strict thermal constraints have led to a sophisticated opto-mechanical design. This paper, being the second of a sequence of two on the Multispectral Imager describes the VNS instrument concept chosen to fulfil the performance requirements within the resource and accommodation constraints. |
| Databáze: | OpenAIRE |
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