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Proceedings Paper

Design and development of a cryogenic high-accuracy refractometer
Author(s): Paolo Spanò; Andrea Bianco; Giorgio Toso; Marco Canetti; Alessandro Battocchio
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Paper Abstract

We present the development of a demonstration prototype for a compact and relatively cheap system capable to measure the refraction index of glasses, between 0.4 to 1.7 micron, at room and cryogenic temperatures (T=100-300 K), with an absolute precision of few parts of 10-5. The basic concept is the measurement of the deviation angle of monochromatic light passing through a prism sample placed in the cryogenic chamber. The precision of the measurements depends on many factors, in particular the angle measurement and the thermal stability, therefore the system can control its alignment. The main issue is the trade-off between the simplicity of the set-up and the precision of the refractive index measurement.

Paper Details

Date Published: 23 July 2008
PDF: 8 pages
Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70184K (23 July 2008); doi: 10.1117/12.789279
Show Author Affiliations
Paolo Spanò, INAF-Osservatorio Astronomico di Brera (Italy)
Andrea Bianco, INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica (Italy)
Giorgio Toso, INAF-Osservatorio Astronomico di Brera (Italy)
Marco Canetti, Rial Vacuum S.p.A. (Italy)
Alessandro Battocchio, SKG Italia S.p.A. (Italy)

Published in SPIE Proceedings Vol. 7018:
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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