Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/6015
Title: Opto-thermal analysis of a lightweighted mirror for solar telescope
Authors: Banyal, R. K
Ravindra, B
Chatterjee, S
Keywords: Optical design and fabrication;Telescopes;Mirror;Thermal effects;Optical materials;Aberration expansions
Issue Date: 25-Mar-2013
Publisher: Optical Society of America
Citation: Optics Express, Vol. 21, No. 6, pp. 7065-7081
Abstract: In this paper, an opto-thermal analysis of a moderately heated lightweighted solar telescope mirror is carried out using 3D finite element analysis (FEA). A physically realistic heat transfer model is developed to account for the radiative heating and energy exchange of the mirror with surroundings. The numerical simulations show the non-uniform temperature distribution and associated thermo-elastic distortions of the mirror blank clearly mimicking the underlying discrete geometry of the lightweighted substrate. The computed mechanical deformation data is analyzed with surface polynomials and the optical quality of the mirror is evaluated with the help of a ray-tracing software. The thermal print-through distortions are further shown to contribute to optical figure changes and mid-spatial frequency errors of the mirror surface. A comparative study presented for three commonly used substrate materials, namely, Zerodur, Pyrex and Silicon Carbide (SiC) is relevant to vast area of large optics requirements in ground and space applications.
Description: Restricted Access
URI: http://hdl.handle.net/2248/6015
ISSN: 1559-128X
???metadata.dc.rights???: © Optical Society of America
???metadata.dc.relation.uri???: http://dx.doi.org/10.1364/OE.21.007065
http://arxiv.org/abs/1302.6600
Appears in Collections:IIAP Publications

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