Thermal effects on beryllium mirrors

Details Thermal effects on beryllium mirrors Thermal effects on beryllium mirrors

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989spie.1118..101w&link_type=abstract

IN: Space optical materials and space qualification of optics; Proceedings of the Meeting, Orlando, FL, Mar. 30, 31, 1989 (A90-4

Physics

Optics

Beryllium, Mirrors, Thermal Degradation, Optical Equipment, Spacecraft Instruments

Scientific paper

When used as an optical surface, Be structures are Ni plated; this results in a coefficient of thermal expansion differential-based, deformation-inducing bimetallic effect which can significantly degrade optical system performance. Prospective large Ni-plated/Be-structure spaceborne optics' temperature-induced temporal deformations have prompted two sets of tests to ascertain the severity of the bimetallic effects. It is found that, over a surprisingly wide range of bulk steady-state temperatures (14-36 C), mirror surface deformations remain confined within encouragingly narrow limits.

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