SMATT, a tool that measures the mechanical loads on the support points of the TMT primary mirror supports

Jan Nijenhuis; Nico van der Heiden; Wouter Jonker

doi:10.1117/12.2630162

6 September 2022 SMATT, a tool that measures the mechanical loads on the support points of the TMT primary mirror supports

Jan Nijenhuis, Nico van der Heiden, Wouter Jonker

Author Affiliations +

Proceedings Volume 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V; 121880L (2022) https://doi.org/10.1117/12.2630162
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

TMT will be a telescope with 492 segments making up the primary mirror. Each of these segments is supported with a highly sophisticated Segment Support Assembly (SSA) and each of them is to be tested for acceptance using a tool called SMATT. This tool will be mounted on top of each SSA and provides the load distribution applied to its 27 support points. These loads will vary slightly due to mechanical tolerances which is perfectly acceptable and can be predicted using FE-analysis. However manufacturing errors and parasitic stiffness contributions may cause unacceptable deviations. This should be avoided. The article will describe the functioning of SMATT. The tool is designed such that the segment support loads can be measured in any position. In the SSA, 21 Warping Harnesses (WH) are implemented to actively compensate for Surface Form Errors (SFE). These WH can also be verified for proper functioning when using SMATT.

Citation Download Citation

Jan Nijenhuis, Nico van der Heiden, and Wouter Jonker "SMATT, a tool that measures the mechanical loads on the support points of the TMT primary mirror supports", Proc. SPIE 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V, 121880L (6 September 2022); https://doi.org/10.1117/12.2630162

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