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Proceedings Paper

Thermo-structural analysis of stresses during fabrication of an optical element for the APF camera
Author(s): Gerald Cabak; David Hilyard
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Paper Abstract

The Automated Planet Finder (APF) is a new telescope on Mount Hamilton with an instrument designed and built by UCO. During the development of the instrument's camera lens assembly the largest optical element fractured during fabrication. The glass grade is a relatively robust material and not known for any special sensitivity. Transient thermal and structural FEA modeling was performed on the element geometry for several glass materials to better understand the mechanics involved and the relative nature of the properties and response of the glass that failed. Results show that the glass in question yielded the highest surface stresses of all those considered and high internal stresses as well. The analysis technique described here is a simple tool that can be used to evaluate a material and make valid comparisons with others.

Paper Details

Date Published: 25 September 2012
PDF: 13 pages
Proc. SPIE 8449, Modeling, Systems Engineering, and Project Management for Astronomy V, 84491M (25 September 2012); doi: 10.1117/12.924376
Show Author Affiliations
Gerald Cabak, Univ. of California Observatories, Univ. of California, Santa Cruz (United States)
David Hilyard, Univ. of California Observatories, Univ. of California, Santa Cruz (United States)


Published in SPIE Proceedings Vol. 8449:
Modeling, Systems Engineering, and Project Management for Astronomy V
George Z. Angeli; Philippe Dierickx, Editor(s)

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