2 August 2014 Heating of polymer-based filters in sub-mm space optics
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The heating of polymer-based filters for experiment working in mm and FIR bands will be described in this paper. This effect was assessed by doing a comparison between a computer model and data available in literature. Firstly, a theoretical study of the physical quantities relevant to the filters materials such as Polypropylene and Polytetrafluoroethylene was performed. These were then used to create a multi-physics computer model that takes into account thermal and radiative heating of large optical elements such as filters and lenses, the geometry of which was suggested by the large format array instruments designed for future post-Planck CMB space missions. Overall, it was found that all the filters reached a different equilibrium temperature depending on the model considered, with time constant values between 1000 and 1300 s. The maximum deviation from the initial condition was measured between 0.09 K and 1.3 K in the worst cases and the amplitude and phase caused by the period of the heat source were also measured.
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Nicola Baccichet, Nicola Baccichet, Giorgio Savini, Giorgio Savini, } "Heating of polymer-based filters in sub-mm space optics", Proc. SPIE 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave, 91434K (2 August 2014); doi: 10.1117/12.2055842; https://doi.org/10.1117/12.2055842

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