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Proceedings Paper

Optical scatter due to impact effects
Author(s): Alan J. Watts; D. R. Atkinson; C. R. Coombs; L. B. Crowell; Michael Black
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Paper Abstract

Much recent data from the Long Duration Exposure Facility (LDEF) have confirmed that for multiyear periods in low earth orbit (LEO) many satellite surfaces (especially the leading edge, or RAM) are subjected to significant bombardment by small particles in the 1 to 100 micron size domain. These particles are both micrometeoroids and man-made debris. Of interest is the consequential effects on precision surfaces such as high-resolution optics. The damage produced does not necessarily seriously downgrade the reflectivity (for mirrors) or transmissivity (for lenses), but can significantly worsen optical scatter. Since many optics are not simple metal mirrors, for which the major response is near-hemispherical cratering, but are frequently comprised of brittle dielectrics (including multilayer coatings) which suffer conchoidal cratering, star cracking, and interlayer differential delamination, the correlation between the induced mechanical damage and the resulting optical scatter is complex. An approach is given which attempts to analytically predict the material damage modes for various impact conditions, and also correlate this damage with optical scatter.

Paper Details

Date Published: 11 January 1993
PDF: 10 pages
Proc. SPIE 1761, Damage to Space Optics, and Properties and Characteristics of Optical Glass, (11 January 1993); doi: 10.1117/12.142664
Show Author Affiliations
Alan J. Watts, POD Associates, Inc. (United States)
D. R. Atkinson, POD Associates, Inc. (United States)
C. R. Coombs, POD Associates, Inc. (United States)
L. B. Crowell, POD Associates, Inc. (United States)
Michael Black, Air Force Phillips Lab. (United States)

Published in SPIE Proceedings Vol. 1761:
Damage to Space Optics, and Properties and Characteristics of Optical Glass
James B. Breckinridge; Alexander J. Marker III, Editor(s)

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