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Infrared optical element mounting techniques for wide temperature ranges.

Authors
  • Saggin, Bortolino
  • Tarabini, Marco
  • Scaccabarozzi, Diego
Type
Published Article
Journal
Applied Optics
Publisher
The Optical Society
Publication Date
Jan 20, 2010
Volume
49
Issue
3
Pages
542–548
Identifiers
DOI: 10.1364/AO.49.000542
PMID: 20090823
Source
Medline
License
Unknown

Abstract

We describe the optimization of a mounting system for the infrared (IR) optics of a spaceborne interferometer working in the temperature range between -120 degrees C and +150 degrees C. The concept is based on an aluminum alloy frame with designed mechanical compliance, which allows for compensation of the different coefficient of thermal expansion between the optics and the holder; at the same time, the system provides for the high stiffness required to reach natural frequencies above 200 Hz, which are mandatory in most space missions. Thermal adapters with properly chosen thermomechanical characteristics are interposed between the metallic structure and the lens, so as to reduce the interface stresses on the mechanically weak IR material, due to both the thermoelastic and acceleration loads. With the proposed mount, the competitive requirements of stiffness and stress-free mounting can be matched in wide temperature ranges. The case study of the interferometer of a miniaturized Fourier transform IR spectrometer is presented.

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