The Cassegrain Telescope primary mirror isostatic mount design for thermal stress

Details The Cassegrain Telescope primary mirror isostatic mount design for thermal stress The Cassegrain Telescope primary mirror isostatic mount design for thermal stress

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010spie.7813e..19h&link_type=abstract

Remote Sensing System Engineering III. Edited by Ardanuy, Philip E.; Puschell, Jeffery J. Proceedings of the SPIE, Volume 7813,

Physics

Scientific paper

The effect of iso-static mount (ISM) configuration of the Cassegrain telescope primary mirror under thermal stress has been studied. The material of mirror is selected to be Zerodur, and light weight ratio of mirror is 50%. The thermal stress can lead to the thermal deformation and degradation of system MTF. Thermal deformation distribution of the mirror has been calculated from the Finite Element Analysis software with the input of thermal distribution. Zernike polynomial was then used to represent the mirror deformation such that the system MTF can be predicted. It is found that MTF of the telescope system is sensitive for ISM arm angle ranging from 50 to 68 degrees.

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