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2 August 2004 Support schemes and thermal effects analyses of large-aperture interferometer mirrors
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The support schemes and thermoelastic deformation of 460-mm diameter interferometer mirrors are studied by means of finite element method. The surface deformation and stress distribution in a variety of support schemes are analyzed. By comparison, the band support with 180°wrap angle and a dentiform rubber-lined strip is accepted to be the optimum. In the optimal support scheme, the thermoelastic deformation analyses for mirrors are carried out at specified thermal gradients (axial, radial, circumferential temperature differences). The contours of surface deformation and the transmitted wavefront distortion are presented respectively. According to the results, it is clear that the influence of thermal effects is much greater than the ones of mechanical forces. Lastly, some suggestions are given to eliminate the effects of thermal turbulence.
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Rongwei Xu, Liren Liu, Luan Zhu, and Hongzhan Liu "Support schemes and thermal effects analyses of large-aperture interferometer mirrors", Proc. SPIE 5531, Interferometry XII: Techniques and Analysis, (2 August 2004);

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