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Proceedings Paper

Optical displacement sensor (ODS): an inertial reference sensor candidate for LISA
Author(s): Meng P. Chiao; Frank G. Dekens; Alexander R. Abramovici
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Paper Abstract

We propose here an optical displacement sensor (ODS) as a supplemental or backup sensor for the LISA inertial reference sensor concept. This simple ODS consists of a laser diode and a quad-cell photodiode (both commercially available). The inertial mass' reflective surface directs the laser beam onto the quad-cell photodiode. Changes in the inertial mass' position and orientation are then extracted from ratios of the differences and sums of the quad-cell photodiode outputs. A simpler proto-type using a 200 microns wide slit has demonstrated a resolution of 10 nm/square root Hz at 1 mHz and 1 nm/square root Hz above 5 mHz. The electronics noise was 1 nm/square root Hz at and above 1 mHz with simple and off the shelf electronics components. Although this ODS' current performance does not meet the LISA's system requirement1 of 1 nm/rtHz at 1 mHz, we think that is achievable in the near future.

Paper Details

Date Published: 26 February 2003
PDF: 9 pages
Proc. SPIE 4856, Gravitational-Wave Detection, (26 February 2003); doi: 10.1117/12.461494
Show Author Affiliations
Meng P. Chiao, Jet Propulsion Lab. (United States)
Frank G. Dekens, Jet Propulsion Lab. (United States)
Alexander R. Abramovici, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 4856:
Gravitational-Wave Detection
Peter Saulson; Adrian M. Cruise, Editor(s)

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