Thermal effects in the Solar Disk Sextant telescope

Year: 2004

Authors: Spagnesi C., Vannoni M., Molesini G., Righini A.

Autors Affiliation: Ist. Nazionale di Ottica Applicata, Largo E. Fermi 6, 50125 Firenze, Italy; Dipartimento di Astronomia, Largo E. Fermi 2, 50125 Firenze, Italy

Abstract: The Solar Disk Sextant (SDS) is an instrument conceived to monitor the diameter of the Sun and its oscillations. A key component of the SDS is the Beam Splitting Wedge (BSW), whose function is to provide calibration to the geometry of the focal plane. The thermal behavior of the BSW is critical, as it affects the overall performance of the instrument. Modelling the elements of the BSW and the basic thermal processes is shown to account for experimental evidences of defocusing observed in early measurements with a balloon borne prototype. Basic requirements for accurate thermal stabilization on board of the final instrument are derived.

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KeyWords: Aberrations; Computer simulation; Imaging techniques; Optical beam splitters; Optical systems; Oscillations; Polynomials; Sun; Thermodynamic stability; Optomechanical engineering; Plate modeling; Solar disk sextant; Thermal bending, Optical telescopes
DOI: 10.1117/12.512389

Citations: 2
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