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Proceedings Paper

Compact laser interferometer for translation and tilt measurement as optical readout for the LISA inertial sensor
Author(s): Thilo Schuldt; Martin Gohlke; Dennis Weise; Ulrich Johann; Achim Peters; Claus Braxmaier
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Paper Abstract

The space mission LISA (Laser Interferometer Space Antenna) aims at detecting gravitational waves in the frequency range 30 μ Hz to 1Hz. Free flying proof masses inside the satellites act as inertial sensors and represent the end mirrors of the interferometer. In the current baseline design, LISA utilizes an optical readout of the position and tilt of the proof mass with respect to the satellite housing. This readout must have ~ 5pm/√Hz sensitivity for the translation measurement (for frequencies above 2.8mHz with an ƒ-2 relaxation down to 30 μHz) and ~ 10 nrad/√Hz sensitivity for the tilt measurement (for frequencies above 0.1mHz with an ƒ-1 relaxation down to 30 μHz). The University of Applied Sciences Konstanz (HTWG) ‐ in collaboration with Astrium GmbH, Friedrichshafen, and the Humboldt-University Berlin ‐ therefore develops a highly symmetric heterodyne interferometer implementing differential wavefront sensing for the tilt measurement. We realized a mechanically highly stable and compact setup. In a second, improved setup we measured initial noise levels below 5 pm/√Hz and 10 nrad/√Hz, respectively, for frequencies above 10mHz.

Paper Details

Date Published: 10 October 2007
PDF: 9 pages
Proc. SPIE 6716, Optomechatronic Sensors and Instrumentation III, 67160F (10 October 2007); doi: 10.1117/12.754211
Show Author Affiliations
Thilo Schuldt, Humboldt-Univ. zu Berlin (Germany)
Hochschule für Technik, Wirtschaft und Gestaltung (Germany)
Martin Gohlke, Humboldt-Univ. zu Berlin (Germany)
Astrium GmbH (Germany)
Dennis Weise, Astrium GmbH (Germany)
Ulrich Johann, Astrium GmbH (Germany)
Achim Peters, Humboldt-Univ. zu Berlin (Germany)
Claus Braxmaier, Hochschule für Technik, Wirtschaft und Gestaltung (Germany)
Astrium GmbH (Germany)

Published in SPIE Proceedings Vol. 6716:
Optomechatronic Sensors and Instrumentation III

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