Direct measurement of total emissivities at cryogenic temperatures: Application to satellite coatings |
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| Authors: | P Herve N Rambure A Sadou D Ramel L Francou P Delouard E Gavila |
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| Affiliation: | 1. Université Paris 10, 1 Chemin Desvallières, 92410 Ville d’Avray, France;2. Contraves Space AG, Schaffhauserstrasse, 580 CH-8052 Zürich, Switzerland;3. Alcatel Space, 100 boulevard du Midi, BP99-06322 Cannes La Bocca, France;1. Departamento de Física de la Materia Condensada, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Barrio Sarriena s/n, 48940 Leioa, Bizkaia, Spain;2. Instituto de Síntesis y Estudio de Materiales, Universidad del País Vasco, Apdo. 644, 48080 Bilbao, Spain;3. Instituto de Ciencia de Materiales de Madrid, (ICMM-CSIC), Campus Cantoblanco, 28049 Madrid, Spain;1. Department of Civil, Environmental and Mechanical Engineering, University of Trento, Via Mesiano 77, 38123 Trento, Italy;2. Engineer Self-employee, via Miramonti 4, 38068 Rovereto (Tn), Italy;3. Department of Industrial Engineering, University of Trento, Via Mesiano 77, 38123 Trento, Italy;1. Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology, School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China;2. Infrared Optoelectronic Science and Technology Key Laboratory of Henan Province, College of Physics and Materials Science, Henan Normal University, Xinxiang, Henan 453007, China |
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| Abstract: | This paper presents a direct measurement method for optical properties of different materials at cryogenic temperatures from 20 K to 200 K. It has been developed within the framework of the design of Planck program. Planck is a satellite of the European Space Agency (ESA) that will be launched in 2008. The scientific goal of the Planck mission is to make observations of the temperature anisotropy and polarisation of the Cosmic Microwave Background. The equivalent temperature of the observed radiation is about 3 K and the telescope baffle temperature should not exceed 60 K in order to work properly. The large Planck telescope is passively cooled by radiating to the Deep Space, so that a good knowledge of the thermo-optical properties of its coating is of utmost importance for thermal modelling. However, up to now, few measurements have been done at such low temperatures. We derived a direct measurement method for the total directional emissivity of various coatings of interest for satellites applications. The effective spectral range chosen the measurements covers 6–800 μm. We will describe the design of the measurement apparatus and present results for several coatings. |
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