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Proceedings Paper

Thermal Effects On Beryllium Mirrors
Author(s): Shep Weinswig
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Paper Abstract

Beryllium is probably the most frequently used material for spaceborne system scan mirrors. Beryllium's properties include lightweightedness, high Young's modulus, high stiffness value, high resonance value. As an optical surface, beryllium is usually nickel plated in order to produce a higher quality surface. This process leads to the beryllium mirror acting like a bimetallic device. The mirror's deformation due to the bimetallic property can possibly degrade the performance of the associated optical system. As larger space borne systems are designed and as temperature considerations become more crucial in the instruments, the concern about temporal deformation of the scan mirrors becomes a prime consideration. Therefore, two sets of tests have been conducted in order to ascertain the thermal effects on nickel plated beryllium mirrors. These tests are categorized as follows: 1. On seven small samples of nickel plated beryllium, the bimetallic effect was measured under very controlled conditions. 2. On a large (20" diameter) nickel plated beryllium space quality mirror, the bending of the mirror as a function of temperature was determined. The purpose of this paper is to present the values of the bimetallic effect on typical nickel plated beryllium mirrors.

Paper Details

Date Published: 26 October 1989
PDF: 12 pages
Proc. SPIE 1118, Space Optical Materials and Space Qualification of Optics, (26 October 1989); doi: 10.1117/12.960951
Show Author Affiliations
Shep Weinswig, E/O Systems (United States)

Published in SPIE Proceedings Vol. 1118:
Space Optical Materials and Space Qualification of Optics
Robert R. Hale, Editor(s)

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