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Proceedings Paper • Open Access

Mechanical design and qualification of IR filter mounts and filter wheel of INSAT-3D sounder for low temperature
Author(s): A. P. Vora; J. B. Rami; A. K. Hait; C. P. Dewan; D. Subrahmanyam; A. S. Kirankumar

Paper Abstract

Next generation Indian Meteorological Satellite will carry Sounder instrument having subsystem of filter wheel measuring Ø260mm and carrying 18 filters arranged in three concentric rings. These filters made from Germanium, are used to separate spectral channels in IR band. Filter wheel is required to be cooled to 214K and rotated at 600 rpm.

This Paper discusses the challenges faced in mechanical design of the filter wheel, mainly filter mount design to protect brittle germanium filters from failure under stresses due to very low temperature, compactness of the wheel and casings for improved thermal efficiency, survival under vibration loads and material selection to keep it lighter in weight. Properties of Titanium, Kovar, Invar and Aluminium materials are considered for design.

The mount has been designed to accommodate both thermal and dynamic loadings without introducing significant aberrations into the optics or incurring permanent alignment shifts. Detailed finite element analysis of mounts was carried out for stress verification.

Results of the qualification tests are discussed for given temperature range of 100K and vibration loads of 12g in Sine and 11.8grms in Random at mount level. Results of the filter wheel qualification as mounted in Electro Optics Module (EOM) are also presented.

Paper Details

Date Published: 21 November 2017
PDF: 8 pages
Proc. SPIE 10566, International Conference on Space Optics — ICSO 2008, 105662O (21 November 2017); doi: 10.1117/12.2308193
Show Author Affiliations
A. P. Vora, Space Applications Ctr. (India)
J. B. Rami, Space Applications Ctr. (India)
A. K. Hait, Space Applications Ctr. (India)
C. P. Dewan, Space Applications Ctr. (India)
D. Subrahmanyam, Space Applications Ctr. (India)
A. S. Kirankumar, Space Applications Ctr. (India)

Published in SPIE Proceedings Vol. 10566:
International Conference on Space Optics — ICSO 2008
Josiane Costeraste; Errico Armandillo; Nikos Karafolas, Editor(s)

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