Computer Science – Performance
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991spie.1532..137c&link_type=abstract
In: Analysis of optical structures; Proceedings of the Meeting, San Diego, CA, July 23, 24, 1991 (A93-38415 15-37), p. 137-145.
Computer Science
Performance
1
Finite Element Method, Mirrors, Telescopes, Temperature Effects, Bending Theory, Gratings (Spectra), Honeycomb Structures, Plate Theory, Temperature Distribution
Scientific paper
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.
Cho Myung K.
Poczulp Gary
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