Berlin 2005 – scientific programme
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Q: Quantenoptik und Photonik
Q 46: Optische Meßtechnik & Präzisionsmessungen I
Q 46.7: Talk
Tuesday, March 8, 2005, 15:30–15:45, HU 2002
Measuring Gravitational Waves with GEO600 — •Martin Hewitson — Max-Planck-Institut für Gravitationsphysik Albert-Einstein-Institut Callinstr. 38, 30167-Hannover, Deutschland
GEO600 is a long baseline, dual-recycled Michelson interferometer, which, when fully commissioned, will be able to measure differential displacements of the order of 1×10−19 m. The calibration of the main detector output(s) is one of the key steps in preparing the recorded data for analysis by the various astrophysical search groups involved in the GE0600 project and the wider community. This talk will describe a time-domain calibration scheme that reconstructs, in real-time, the apparent strain, h(t), of the detector.
The scheme uses injected calibration lines to continuously measure the optical response of the detector. By inverting this measured response, and by correcting for the effect of the detector control systems, we can determine the differential arm-length changes of the instrument, and from this, the apparent strain.