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Proceedings Paper

Thin Film Deployable Reflector Model For ET Gamma Ray Imaging Telescope System (ET-GRITS)
Author(s): Vinson B. Huegele
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Paper Abstract

The Marshall Space Flight Center is developing a thin film reflector for a Gamma Ray Imaging Telescope System (GRITS) using the Shuttle External Tank (ET). The concept is to install an inflatable reflector in the ET that could be transferred from the orbiter in orbit. This is a study of a scale model reflector for the ET GRITS application. The approach is to form 1/2 mil film into a spherical mirror mounted on a seven foot diameter metal ring. The ring mount is sealed and slightly evacuated to pressurize the film into shape. Several different fabrication techniques were investigated using seamed gore designs to form the reflector. Also studied was casting a film into a seamless circular sheet. The goal for this model was to achieve a one milliradian (RMS) surface curvature error over 90% of the reflector area. This curvature was measured by a laser scanning instrument.The results show how different reflector designs and fabrication techniques contribute to surface curvature and focusing errors.

Paper Details

Date Published: 11 October 1989
PDF: 5 pages
Proc. SPIE 1113, Reflective Optics II, (11 October 1989); doi: 10.1117/12.955574
Show Author Affiliations
Vinson B. Huegele, Marshall Space Flight Center (United States)

Published in SPIE Proceedings Vol. 1113:
Reflective Optics II
Dietrich G. Korsch, Editor(s)

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