Computer Science – Performance
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009phdt.........4a&link_type=abstract
Proquest Dissertations And Theses 2009. Section 0212, Part 0606 177 pages; [Ph.D. dissertation].United States -- California: St
Computer Science
Performance
1
Drag-Free Satellites, Gravitational Waves, Acceleration Noise
Scientific paper
The detection of gravitational waves in space uses the proof-mass of a drag- free satellite as an inertial reference. The Laser Interferometer Space Antenna (LISA) mission requires a drag-free proof-mass with residual acceleration noise less than 3×10^-15 m s -1 /[Special characters omitted.] and position sensing of 4×10^-11 m/[Special characters omitted.] in a frequency band from 1 mHz to 1 Hz.
The Modular Gravitational Reference Sensor (MGRS) uses a single, optically sensed, spinning sphere as a drag-free reference. By eliminating the need for control forces and torques, we estimate the MGRS residual acceleration noise to be less than 9×10^-16 m s -2 /[Special characters omitted.] , limited by direct disturbances to the proof-mass. We have developed a numeric simulation which demonstrates mass center position determination to better than 3 pm/[Special characters omitted.] limited by the performance of the individual optical sensors.
The Littrow grating cavity sensor is an experimental demonstration of a compact optical sensor designed to have a noise floor below 3 pm/[Special characters omitted.] . Using a Fabry-Perot cavity formed between a Littrow mounted diffraction grating and a reference surface, we have demonstrated a displacement noise of 10 pm/[Special characters omitted.] above 1 Hz. The sensor performance was limited by the laser frequency stability and could be reduced to below 1 pm/[Special characters omitted.] with a stabilized laser source.
This thesis establishes the foundations for the MGRS by investigating noise sources of the MGRS, data analysis techniques required to determine the mass center motion of a spinning sphere, and finally, the experimental demonstration of an optical sensor with displacement noise less than 10 pm/[Special characters omitted.] .
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