13 September 2012 CTE measurement setup with 10 ppb/K sensitivity for characterizing lightweight and highly stable materials for space applications
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Abstract
Structural materials with extremely low coecient of thermal expansion (CTE) are crucial to enable ultimate accuracy in terrestrial as well as in space-based optical metrology due to minimized temperature dependency. Typical materials, in particular in the context of space-based instrumentation are carbon-ber reinforced plastics (CFRP), C/SiC, and glass ceramics, e.g. Zerodur, ULE or Clearceram. To determine the CTE of various samples with high accuracy we utilize a highly symmetric heterodyne interferometer with a noise level below 2 pm√Hz at frequencies above 0.1 Hz. A sample tube made out of the material under investigation is vertically mounted in an ultra-stable support made of Zerodur. Measurement and reference mirrors of the interferometer are supported inside the tube using thermally compensated mounts made of Invar36. For determination of the CTE, a sinusoidal temperature variation is radiatively applied to the tube. One of the essential systematic limitations is a tilt of the entire tube as a result of temperature variation. This tilt can simultaneously be measured by the DWS technique and can be used to correct the measurement. Using a Zerodur tube as a reference, it is shown that this eect can be reduced in post processing to achieve a minimum CTE measurement sensitivity <10 ppb/K.
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Ruven Spannagel, Martin Gohlke, Thilo Schuldt, Ulrich Johann, Dennis Weise, Claus Braxmaier, "CTE measurement setup with 10 ppb/K sensitivity for characterizing lightweight and highly stable materials for space applications", Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 84500Q (13 September 2012); doi: 10.1117/12.926061; https://doi.org/10.1117/12.926061
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