The MATISSE photometric slider: achieving sub-micrometer reproducibility under cryogenic conditions

Felix C. M. Bettonvil; G. Kroes; E. Elswijk; M. de Haan; R. ter Horst; J. Kragt; R. Navarro; M. Schuil; T. Tromp

doi:10.1117/12.2314106

10 July 2018 The MATISSE photometric slider: achieving sub-micrometer reproducibility under cryogenic conditions

Felix C. M. Bettonvil, G. Kroes, E. Elswijk, M. de Haan, R. ter Horst, J. Kragt, R. Navarro, M. Schuil, T. Tromp

Proceedings Volume 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III; 107061A (2018) https://doi.org/10.1117/12.2314106
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

MATISSE is the mid-infrared interferometric spectrograph and imager for ESO’s Very Large Telescope Interferometer (VLTI). A core mechanism inside the Cold Optical bench is the photometric slider, that enables the choice of observation with or without photometric beams which is achieved by sliding in 4 mirrors or 4 beam splitters into the four telescope beams. To achieve the stringent requirements on beam precision -which asks for mounting pad differences of order of 1 micrometer- all optical components were mounted on a single body and one lapped surface. Test results on the final instrument showed behavior significantly outside specification suggesting contact point height differences up to 6 micrometer. Also repeatability was non-compliant. We will present the cause analysis, the suspected culprit, unsuspected side effects and the implementation of the final solution which lead to a photometric slider well within specification.

Conference Presentation

Citation Download Citation

Felix C. M. Bettonvil, G. Kroes, E. Elswijk, M. de Haan, R. ter Horst, J. Kragt, R. Navarro, M. Schuil, and T. Tromp "The MATISSE photometric slider: achieving sub-micrometer reproducibility under cryogenic conditions", Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 107061A (10 July 2018); https://doi.org/10.1117/12.2314106

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