Thermo-structural analysis of stresses during fabrication of an optical element for the APF camera

Gerald Cabak; David Hilyard

doi:10.1117/12.924376

25 September 2012 Thermo-structural analysis of stresses during fabrication of an optical element for the APF camera

Gerald Cabak, David Hilyard

Proceedings Volume 8449, Modeling, Systems Engineering, and Project Management for Astronomy V; 84491M (2012) https://doi.org/10.1117/12.924376
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

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.

Citation Download Citation

Gerald Cabak and David Hilyard "Thermo-structural analysis of stresses during fabrication of an optical element for the APF camera", Proc. SPIE 8449, Modeling, Systems Engineering, and Project Management for Astronomy V, 84491M (25 September 2012); https://doi.org/10.1117/12.924376

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