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The gravitational wave detector LISA utilizes as current baseline a high sensitivity Optical Readout (ORO) for measuring the relative position and tilt of a free flying proof mass with respect to the satellite housing. The required sensitivities in the frequency band from 30 muHz to 1 Hz are in the picometer range for the translation and in the nanoradiant range for the tilt measurement. EADS Astrium,...
The spaceborne gravitational wave detector LISA (Laser Interferometer Space Antenna) utilizes free floating proof masses as inertial references for its 5 million km long interferometer arms. In the current baseline design their position and tilt with respect to the appropriate optical bench is measured by an optical readout which needs picometer sensitivity in translation measurement and nanoradian...
This study develops a heterodyne interferometer utilizing differential wavefront sensing for tilt measurement. The interferometer has sub-nm sensitivity in translation measurement and sub-μrad sensitivity in tilt measurement for the LISA (laser interferometer space antenna) inertial sensor. The interferometer design is based on maximum symmetry where reference and measurement arm have the same optical...
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