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Proceedings Paper

Aperture diameter as a function of relative obscuration for constant NETD and MRTD
Author(s): Per Fredin
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Paper Abstract

A central obscuration in a thermal imager will cause performance degradation. This paper presents diagrams showing the normalized aperture diameter as a function of obscuration ratio under a condition for constant NETD and MRTD. Typically, an increase in the relative obscuration from 40% to 60% of the aperture diameter will require a 20 to 30% larger diameter for constant NETD and a 25 to 25% larger diameter for constant MRTD.

Paper Details

Date Published: 16 September 1992
PDF: 7 pages
Proc. SPIE 1689, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing III, (16 September 1992); doi: 10.1117/12.137971
Show Author Affiliations
Per Fredin, Saab Missiles AB (Sweden)


Published in SPIE Proceedings Vol. 1689:
Infrared Imaging Systems: Design, Analysis, Modeling, and Testing III
Gerald C. Holst, Editor(s)

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