13 May 2013 Fundamental performance determining factors of the ultrahigh-precision space-borne optical metrology system for the LISA Pathfinder mission
Author Affiliations +
Abstract
The LISA Pathfinder mission to space employs an optical metrology system (OMS) at its core to measure the distance and attitude between two freely floating test-masses to picometer and nanorad accuracy, respectively, within the measurement band of [1 mHz, 30 mHz]. The OMS is based upon an ultra-stable optical bench with 4 heterodyne interferometers from which interference signals are read-out and processed by a digital phase-meter. Laser frequency noise, power fluctuations and optical path-length variations are suppressed to uncritical levels by dedicated control loops so that the measurement performance approaches the sensor limit imposed by the phasemeter. The system design is such that low frequency common mode noise which affects the read-out phase of all four interferometers is generally well suppressed by subtraction of a reference phase from the other interferometer signals. However, high frequency noise directly affects measurement performance and its common mode rejection depends strongly on the relative signal phases. We discuss how the data from recent test campaigns point towards high frequency phase noise as a likely performance limiting factor which explains some important performance features.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gerald Hechenblaikner, Gerald Hechenblaikner, Reinhold Flatscher, Reinhold Flatscher, } "Fundamental performance determining factors of the ultrahigh-precision space-borne optical metrology system for the LISA Pathfinder mission", Proc. SPIE 8789, Modeling Aspects in Optical Metrology IV, 87890X (13 May 2013); doi: 10.1117/12.2020498; https://doi.org/10.1117/12.2020498
PROCEEDINGS
12 PAGES


SHARE
RELATED CONTENT

Novel payload architectures for LISA
Proceedings of SPIE (November 21 2017)
Elisa technology consolidation study overview
Proceedings of SPIE (November 17 2017)
Bench-top interferometric test bed for LISA
Proceedings of SPIE (February 26 2003)
LISA interferometry
Proceedings of SPIE (June 28 2006)

Back to Top