Structural and optical properties for typical solid mirror shapes

Details Structural and optical properties for typical solid mirror shapes Structural and optical properties for typical solid mirror shapes

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1303...78c&link_type=abstract

IN: Advances in optical structure systems; Proceedings of the Meeting, Orlando, FL, Apr. 16-19, 1990 (A91-36651 15-74). Bellingh

Physics

Optics

1

Computer Aided Design, Mirrors, Optical Properties, Surface Geometry, Finite Element Method, Geometrical Optics, Scaling Laws, Shapes, Thermal Stresses, Wave Front Deformation

Scientific paper

A method is developed to determine the weight, center of gravity, areal properties, and mass inertial properties for typical mirrors. A number of support conditions were considered to examine optical surface deflections, surface quality, and fundamental natural frequency for single- and double-arch mirror shapes. Structural performance estimates were made with the NASTRAN program, and optical performances were evaluated with the FRINGE program, using an SXA 40-in mirror. To show the behavior of element types from the NASTRAN program, finite element validity and sensitivity studies were performed in optical model applications. Material parameters, contoured back shapes, and support locations are shown to have significant effects on structural and optical performances. Optimal support locations and support points are given. Fundamental natural frequencies for some shapes are found with the closed-form solution. The plate models results may not be acceptable for determining real mirror optical performances.

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