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Proceedings Paper • Open Access

Technological development of multispectral filter assemblies for micro bolometer
Author(s): Roland Le Goff; François Tanguy; Philippe Fuss; Pierre Etcheto

Paper Abstract

Since 2007 Sodern has successfully developed visible and near infrared multispectral filter assemblies for Earth remote sensing imagers. Filter assembly is manufactured by assembling several sliced filter elements (so-called strips), each corresponding to one spectral band. These strips are cut from wafers using a two dimensional accuracy precision process.

In the frame of a 2011 R&T preparatory initiative undertaken by the French agency CNES, the filter assembly concept was adapted by Sodern to the long wave infrared spectral band taken into account the germanium substrate, the multilayer bandpass filters and the F-number of the optics.

Indeed the current trend in space instrumentation toward more compact uncooled infrared radiometer leads to replace the filter wheel with a multispectral filter assembly mounted directly above the micro bolometer window. The filter assembly was customized to fit the bolometer size. For this development activity we consider a ULIS VGA LWIR micro bolometer with 640 by 480 pixels and 25 microns pixel pitch. The feasibility of the concept and the ability to withstand space environment were investigated and demonstrated by bread boarding activities.

The presentation will contain a detailed description of the bolometer and filter assembly design, the stray light modeling analysis assessing the crosstalk between adjacent spectral bands and the results of the manufacturing and environmental tests (damp heat and thermal vacuum cycling).

Paper Details

Date Published: 20 November 2017
PDF: 5 pages
Proc. SPIE 10564, International Conference on Space Optics — ICSO 2012, 105640P (20 November 2017); doi: 10.1117/12.2309068
Show Author Affiliations
Roland Le Goff, SODERN (France)
François Tanguy, SODERN (France)
Philippe Fuss, SODERN (France)
Pierre Etcheto, Ctr. National d'Études Spatiales (France)

Published in SPIE Proceedings Vol. 10564:
International Conference on Space Optics — ICSO 2012
Bruno Cugny; Errico Armandillo; Nikos Karafolas, Editor(s)

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