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Proceedings Paper

Development of a low-pass far-infrared filter for lunar observer horizon sensor application
Author(s): Sohrab Mobasser; Larry S. Horwitz; Dale K. Griffith
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Paper Abstract

A study was conducted to (1) determine the feasibility of design and fabrication of a low pass filter with a relatively sharp cut-on at higher wavelengths (i.e. 30-40 microns), using metallic mesh technique; and (2) investigate whether the combination of this filter and a suitable IR detector, as a part of a Lunar Observer (LO) horizon sensor, is capable of detecting radiation emanating from two blackbody sources kept at temperatures simulating space and the surface temperature of dark or lit sides of the moon. Various designs of multilayer metallic mesh filters with different mesh parameters and substrate thicknesses were simulated. Using mesh parameters corresponding to the optimum four-layer filter design, a filter was fabricated on a 6.35 micron thick mylar substrate. The transmission curve of the fabricated filter is very close to what the simulation predicted. Room temperature signal level tests were performed on the combination of filter-detector assemblies. The data obtained from these tests indicate that the assembly can detect temperature differences as low as few degrees K between two black bodies.

Paper Details

Date Published: 1 December 1991
PDF: 11 pages
Proc. SPIE 1540, Infrared Technology XVII, (1 December 1991); doi: 10.1117/12.48784
Show Author Affiliations
Sohrab Mobasser, Jet Propulsion Lab. (United States)
Larry S. Horwitz, Applied Modern Technologies Corp. (United States)
Dale K. Griffith, Applied Modern Technologies Corp. (United States)

Published in SPIE Proceedings Vol. 1540:
Infrared Technology XVII
Bjorn F. Andresen; Marija Scholl; Irving J. Spiro, Editor(s)

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