7 March 2003 Thermal effects and thermal compensation in the OSIRIS camera
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Abstract
Tight stability requirements for the imager/spectrograph OSIRIS (a Day One optical instrument for the GTC telescope) demand a careful treatment of thermal effects within the OSIRIS camera. Mostly due to the thermal response of refraction indices of its glasses (and not so much to curvature, spacing or thickness variations of the lenses), the camera optics alone degrades beyond requirements the image quality and plate scale under the expected ambient temperature variations (about 1.8 °C/hour). Thermal effects and thermal compensator studies of the OSIRIS camera are first summarized, before discussing how the motion (of a few microns per °C) of the 3rd camera doublet, as a sole compensator, practically eliminates thermal influences on both image quality and plate scale. A concept for the passive implementation of the compensator is also discussed.
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J. Jesus Gonzalez, J. Jesus Gonzalez, Carlos Tejada, Carlos Tejada, Alejandro Farah, Alejandro Farah, Jose Luis Rasilla, Jose Luis Rasilla, F. Javier Fuentes, F. Javier Fuentes, } "Thermal effects and thermal compensation in the OSIRIS camera", Proc. SPIE 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, (7 March 2003); doi: 10.1117/12.461439; https://doi.org/10.1117/12.461439
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