Infrared optical coatings for the EarthCARE Multispectral Imager

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Hawkins, G., Woods, D., Sherwood, R. and Djotni, K. (2014) Infrared optical coatings for the EarthCARE Multispectral Imager. Applied Optics, 53 (30). pp. 6983-6992. ISSN 0003-6935 doi: 10.1364/AO.53.006983

Abstract/Summary

The Earth Cloud, Aerosol and Radiation Explorer mission (EarthCARE) Multispectral Imager (MSI) is a radiometric instrument designed to provide the imaging of the atmospheric cloud cover and the cloud top surface temperature from a sun-synchronous low Earth orbit. The MSI forms part of a suite of four instruments destined to support the European Space Agency Living Planet mission on-board the EarthCARE satellite payload to be launched in 2016, whose synergy will be used to construct three-dimensional scenes, textures and temperatures of atmospheric clouds and aerosols. The MSI instrument contains seven channels: four solar channels to measure visible and short-wave infrared wavelengths, and three channels to measure infrared thermal emission. In this paper, we describe the optical layout of the infrared instrument channels, thin-film multilayer designs, the coating deposition method and the spectral system throughput for the bandpass interference filters, dichroic beam splitters, lenses and mirror coatings to discriminate wavelengths at 8.8, 10.8, & 12.0 µm. The rationale for the selection of thin-film materials, spectral measurement technique, and environmental testing performance are also presented.

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Item Type Article
URI https://reading-clone.eprints-hosting.org/id/eprint/38433
Identification Number/DOI 10.1364/AO.53.006983
Refereed Yes
Divisions Science > School of Mathematical, Physical and Computational Sciences > Department of Computer Science
Uncontrolled Keywords Space instrumentation, Infrared, Filters, Thin films, Interference Filters, Spectral properties
Publisher Optical Society of America
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