Experimental determination of the refractive index spectral and thermal variation and transparency quantification of fluorine fluids for the MezzoCielo telescope

Silvio Di Rosa; Roberto Ragazzoni; Maria G. Pelizzo; Alain J. Corso; Giovanni Santi; Carmelo Arcidiacono; Demetrio Magrin; Marco Dima

doi:10.1117/12.3020040

26 August 2024 Experimental determination of the refractive index spectral and thermal variation and transparency quantification of fluorine fluids for the MezzoCielo telescope

Silvio Di Rosa, Roberto Ragazzoni, Maria G. Pelizzo, Alain J. Corso, Giovanni Santi, Carmelo Arcidiacono, Demetrio Magrin, Marco Dima

Author Affiliations +

Proceedings Volume 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI; 1310046 (2024) https://doi.org/10.1117/12.3020040
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

MezzoCielo (or “half of the sky”), novel concept of extremely large field-of-view monocentric optical devices designed to continuously patrol the whole sky, is an optical sphere which requires the filling of its inner volume with special fluid in order to be actually convergent with reasonable focal ratio (for spherical aberration reduction). This fluid has to be characterized by two main properties, namely low refractive index and extremely high transparency in the visible range, but, of course, many other characteristics, such as thermal and chemical stability over time, no toxicity or flammability, compatibility with glass and metals, are also desirable. By virtue of these considerations, two fluorine liquids have been selected: the fluids commercially known as FC-72, perfluorohexane with n_d = 1.251 at T = 25°C, and Novec7200, ethoxy-nonafluorobutane with n_d = 1.282 at T = 25°C. In this work, the experimental evaluation of their optical properties (refractive index and transparency) in the visible range and in the thermal interval [-10,+25]°C has been carried out in order to verify the data supplied by the manufacturer and to fully characterize their optical behaviour both spectrally and thermally.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Silvio Di Rosa, Roberto Ragazzoni, Maria G. Pelizzo, Alain J. Corso, Giovanni Santi, Carmelo Arcidiacono, Demetrio Magrin, and Marco Dima "Experimental determination of the refractive index spectral and thermal variation and transparency quantification of fluorine fluids for the MezzoCielo telescope", Proc. SPIE 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI, 1310046 (26 August 2024); https://doi.org/10.1117/12.3020040

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