Designing and testing a highly stable ceramic sensor platform for challenging thermoelastic requirements

Mathias Kroedel; Christoph Zauner

doi:10.1117/12.2311964

10 July 2018 Designing and testing a highly stable ceramic sensor platform for challenging thermoelastic requirements

Mathias Kroedel, Christoph Zauner

Proceedings Volume 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III; 107063D (2018) https://doi.org/10.1117/12.2311964
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

The Meteosat Third Generation’s extreme pointing requirements call for a highly stable bracket for mounting the Star Trackers. HB-Cesic^®, a chopped fibre reinforced silicon carbide, was selected as a base material for the sensor bracket. The high thermal conductivity and low thermal expansion of HB-Cesic^® were the key properties to fulfil the demanding thermo-elastic pointing requirements of below 1μrad/K for the Star Trackers mounting interfaces. Dominated by thermoelastic stability requirements, the design and analysis of the Bracket required a multidisciplinary approach with the focus on thermal and thermo-elastic analyses. Dedicated modal and thermal post-processing strategies have been applied in the scope of the light weighting process. The experimental verification of this thermo-elastic stable system has been a challenging task of its own. A thermo-elastic distortion measurement rig was developed with a stability of <0.1μrad/K in all three rotational degrees of freedom.

Citation Download Citation

Mathias Kroedel and Christoph Zauner "Designing and testing a highly stable ceramic sensor platform for challenging thermoelastic requirements", Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 107063D (10 July 2018); https://doi.org/10.1117/12.2311964

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