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4 November 1982 Metrology Mount Development And Verification For A Large Spaceborne Mirror
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This paper describes the development of a metrology mount system for large spaceborne optical elements operating at diffraction limit. Verification tests of the mount, together with confirmation of the finite element model of the mount and mirror system, demonstrate that it is capable of simulating a zero-g environment within an uncertainty band of λ/300 rms for a mirror whose characteristic gravity deformation is 12λ. Using a highly detailed finite element model of the sandwich mirror, the effects of stiffness and mass nonuniformity due to faceplate thickness variations and calibration uncertainties in each of the support points on gravity-release errors were assessed and/or compensated for. The mathematics of optimizing these forces to yield a minimum rms figure error and the method and results of the faceplate thickness mapping to determine the spatial weight and stiff-ness variations are also described. Finally, verification of the finite element model is discussed where predicted, and full aperture interferometrically measured figure changes due to discrete changes in the applied force field are compared.
© (1982) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael H. Krim "Metrology Mount Development And Verification For A Large Spaceborne Mirror", Proc. SPIE 0332, Advanced Technology Optical Telescopes I, (4 November 1982);

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