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Proceedings Paper

Erosion studies of infrared dome materials
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Paper Abstract

The testing reported in this paper operationalized the material requirement: An infrared transparent dome material must be at least as good as magnesium fluoride in rain tests and substantially better than magnesium fluoride in sand tests. Sand erosion test conclusions, based on changes in midwave infrared transmission, are that CleartranTM with the protective coating system tested is not substantially more resistant to large grain sand erosion damage than magnesium fluoride. ALONTM and spinel are substantially more resistant to large grain sand erosion damage than magnesium fluoride. There is no significant transmission difference due to small grain sand erosion observed between any of the tested coupons. Qualitative analysis of coupon damage after exposure to an artificial rain field on a whirling arm showed that ALONTM and spinel are at least as rain erosion resistant as magnesium fluoride, but the coated CleartranTM coupons delaminated rapidly under the same rain test conditions. Testing coupons exposed sequentially to the milder sand condition followed by the whirling arm rain erosion test demonstrated that magnesium fluoride rain resistance is diminished in the combined test, but that ALONTM and spinel retain their robust resistance. Coated CleartranTM delaminated under the combined conditions as well. It is noteworthy that the results reported for the midwave infrared range also apply to the near infrared region above 1 micron.

Paper Details

Date Published: 2 May 2007
PDF: 11 pages
Proc. SPIE 6545, Window and Dome Technologies and Materials X, 65450G (2 May 2007); doi: 10.1117/12.719966
Show Author Affiliations
Roger M. Sullivan, Naval Air Warfare Ctr. (United States)
Andrew Phelps, Univ. of Dayton Research Institute (United States)
James A. Kirsch, U.S. Army Aviation and Missile RDEC (United States)
Earle A. Welsh, Lockheed Martin Missiles and Fire Control (United States)
Daniel C. Harris, Naval Air Systems Command (United States)

Published in SPIE Proceedings Vol. 6545:
Window and Dome Technologies and Materials X
Randal W. Tustison, Editor(s)

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