Passive Support Systems For Thin Mirrors

W. A. Grundmann

doi:10.1117/12.937980

3 November 1983 Passive Support Systems For Thin Mirrors

W. A. Grundmann

Proceedings Volume 0444, Advanced Technology Optical Telescopes II; (1983) https://doi.org/10.1117/12.937980
Event: 1983 Astronomy Conferences, 1983, London, United Kingdom

Abstract

Several different types of passive support systems, suitable for a thin meniscus type mirror in a 3-metre optical telescope, were investigated. A thin F/2 primary mirror with a diameter-to-thickness ratio of 25, as compared to the usual 6 to 8 ratio, is proposed. In order to minimize astigmatism in the mirror figure a support system for a thin mirror must exhibit very low friction or hysteresis effects. Comparisons on the advantages and disadvantages of using pneumatic supports, counterweighted lever supports and hydraulic supports for the axial support mode were made. For a more detailed assessment of the performance of a counterweighted lever system, utilizing commercial flexural pivots instead of ball bearings, full size prototype support units of the axial and radial type were built and tested. Friction and hysteresis losses were observed to be 0.02% for the axial support unit and 0.07% for the radial support unit. These values are low and they are consistent with the requirements of mirror support systems of high quality thin optics.

Citation Download Citation

W. A. Grundmann "Passive Support Systems For Thin Mirrors", Proc. SPIE 0444, Advanced Technology Optical Telescopes II, (3 November 1983); https://doi.org/10.1117/12.937980

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