Active surface correction of metallic honeycomb sandwich mirrors

Brent J. Backhaus; Steven E. Forman

doi:10.1117/12.21539

1 October 1990 Active surface correction of metallic honeycomb sandwich mirrors

Brent J. Backhaus, Steven E. Forman

Proceedings Volume 1303, Advances in Optical Structure Systems; (1990) https://doi.org/10.1117/12.21539
Event: 1990 Technical Symposium on Optics, Electro-Optics, and Sensors, 1990, Orlando, FL, United States

Abstract

A common method for correcting wavefront aberrations in an optical system involves using an array of actuators to deform the optical surface of a mirror until the aberrations are reduced or eliminated. Recent interest in metallic sandwich mirrors, where the optical surface is separated from the back surface by a lightweighted core, has created the need for a method to correct wavefront aberrations other than by applying tuator forces. One possible way to deform the optical surface of a sandwich mirror is by ndependently pressurizing cells within the core of the mirror. A method of active correction utilizing independently ressithzed "mro-ce11s" in the core of an 18-inch di& aluminum honeycomb sandwich mirror has been attempted. This paper describes the experiments and the finite element analyses which were conducted on 6-inch mirror blanks containing progressively more complex single macro-cells; and the experiments condtxted on two 18-inch mirror blanks, one with a cellular honeycomb core and the other with a machined aluminum core, each containing 19 individual macro-cells. Results from the multiple macro-ceU mirror blanks show that establishing a spatially variable pressure distribution in the core of a sandwich mirror can be an effective active method for deforming the mirror's optical surface.

Citation Download Citation

Brent J. Backhaus and Steven E. Forman "Active surface correction of metallic honeycomb sandwich mirrors", Proc. SPIE 1303, Advances in Optical Structure Systems, (1 October 1990); https://doi.org/10.1117/12.21539

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