1 December 1991 Surface distortions of a 3.5-meter mirror subjected to thermal variations
Author Affiliations +
Abstract
Finite element analyses were performed to predict the optical surface distortions for a 3.5-meter borosilicate glass structured mirror due to the effects of thermal variations. In order to evaluate the performance of the mathematical mirror model, a parallel experimental study was conducted at the National Optical Astronomy Observatories (NOAO). A total of 666 thermal sensors was bonded to the mirror for the experiment. Temperature distributions measured by the thermal sensors were directly translated by an interface program into a set of the nodal temperatures for input for the numerical model, and the optical surface distortions were calculated. Excellent agreement between the experimental and numerical results were found. Additionally, an analytical approach for a linear thermal gradient along the optical axis was made, and the result agreed closely with that from the finite element analysis.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Myung K. Cho, Myung K. Cho, Gary A. Poczulp, Gary A. Poczulp, } "Surface distortions of a 3.5-meter mirror subjected to thermal variations", Proc. SPIE 1532, Analysis of Optical Structures, (1 December 1991); doi: 10.1117/12.48261; https://doi.org/10.1117/12.48261
PROCEEDINGS
9 PAGES


SHARE
RELATED CONTENT

Thermal stability of CVD-SiC lightweight optics
Proceedings of SPIE (October 22 1995)
Finite element analysis of lightweight active primary mirror
Proceedings of SPIE (October 14 2012)
Optimization of the ATST primary mirror support system
Proceedings of SPIE (July 05 2006)
Active optics system for a 3.5-meter structured mirror
Proceedings of SPIE (November 30 1991)
Thermo-elastic analysis of large optical systems
Proceedings of SPIE (December 27 1992)

Back to Top