Hannover 2010 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 14: Precision Measurements and Metrology II
Q 14.4: Vortrag
Dienstag, 9. März 2010, 15:00–15:15, A 310
Interferometry based high-precision dilatometry — •Eugen Stoppel1,3, Martin Gohlke1,2, Thilo Schuldt2,3, Dennis Weise1, Ulrich Johann1, and Claus Braxmaier3 — 1EADS Astrium — 2Humboldt-Universität zu Berlin — 3HTWG Konstanz
In the scope of the gravitational wave detector LISA (Laser Interferometer Space Antenna), EADS Astrium in collaboration with the Humboldt-University Berlin and the University of Applied Sciences Konstanz (HTWG) developed a heterodyne interferometer, combined with technique of the so-called differential wavefront sensing for angle measurements. Based on the heterodyne interferometer, an optical dilatometer for high-accuracy and high-resolution measurement of the linear coefficient of thermal expansion (CTE) was realized.
With the first setup a CTE below 0.1 × 10−6 1/K can be measured. In a new design all main parts are made of ultra stable glass ceramic instead of aluminum, in order to bring the noise performance to the theoretical limit of 10−9 1/K.
In this presentation, the dilatometer and first results of the measurements will be presented.