Aperture diameter as a function of relative obscuration for constant NETD and MRTD

Per Fredin

doi:10.1117/12.137971

16 September 1992 Aperture diameter as a function of relative obscuration for constant NETD and MRTD

Per Fredin

Author Affiliations +

Proceedings Volume 1689, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing III; (1992) https://doi.org/10.1117/12.137971
Event: Aerospace Sensing, 1992, Orlando, FL, United States

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.

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Per Fredin "Aperture diameter as a function of relative obscuration for constant NETD and MRTD", Proc. SPIE 1689, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing III, (16 September 1992); https://doi.org/10.1117/12.137971

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