The effects of thermal gradients on the Mars Observer Camera primary mirror

Details The effects of thermal gradients on the Mars Observer Camera primary mirror The effects of thermal gradients on the Mars Observer Camera primary mirror

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992spie.1690..376a&link_type=abstract

In: Design of optical instruments; Proceedings of the Meeting, Orlando, FL, Apr. 22-24, 1992 (A93-29781 11-74), p. 376-386.

Physics

Optics

Cameras, Graphite-Epoxy Composites, Mars Observer, Mirrors, Temperature Gradients, Thermal Expansion, Cassegrain Optics, Finite Element Method, Optical Properties

Scientific paper

The paper discusses the effect of thermal gradients on the optical performance of the primary mirror of Mars Observer Camera (MOC), which will be launched on the Mars Observer spacecraft in September 1992. It was found that mild temperature gradients can have a large effect on the mirror surface figure, even for relatively low coefficient-of-thermal-expansion materials. However, in the case of the MOC primary mirror, it was found that the radius of curvature (ROC) of the reflective surface of the mirror changed in a nearly linear fashion with the radial temperature gradient, with little additional aberration. A solid-state ROC controller using the thermal gradient effect was implemented and verified.

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