VLT secondary mirror unit performance and test results

Reiner Barho; Stefano Stanghellini; Georg Jander

doi:10.1117/12.319277

25 August 1998 VLT secondary mirror unit performance and test results

Reiner Barho, Stefano Stanghellini, Georg Jander

Proceedings Volume 3352, Advanced Technology Optical/IR Telescopes VI; (1998) https://doi.org/10.1117/12.319277
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

Abstract

This paper explains the overall mechanical functions of the Very Large Telescope Secondary Mirror Unit (VLT-M2 Unit), and the method of their verification by tests inside two different test adapters. The cinematic mechanisms of the M2 Unit are the Focusing Stage, Centering Stage and the Chopping Assembly which enables to adjust the position of the secondary mirror along 5 degrees of freedom. All these mechanisms are characterized by very high stiffness and accuracy, long lifetime and high reliability. The presentation of the finally achieved performance test results of the M2 Unit, realized by their high precision mechanisms, are the major points of this presentation.

Citation Download Citation

Reiner Barho, Stefano Stanghellini, and Georg Jander "VLT secondary mirror unit performance and test results", Proc. SPIE 3352, Advanced Technology Optical/IR Telescopes VI, (25 August 1998); https://doi.org/10.1117/12.319277

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