TL;DR
This paper describes the design, error analysis, and experimental validation of the ST7 interferometer system on LISA Pathfinder, achieving high-precision measurements of test mass separation for gravitational wave detection.
Contribution
It introduces a homodyne Michelson interferometer setup with detailed error analysis and experimental results, advancing precision measurement techniques for space-based gravitational wave observatories.
Findings
Achieved 30 pm/√Hz sensitivity at 10 mHz
Identified key error sources affecting measurement accuracy
Validated interferometer performance through experiments
Abstract
Two homodyne Michelson interferferometers aboard the LISA Pathfinder spacecraft will measure the the positions of two free-floating test masses, as part of the NASA ST7 mission. The interferometer is required to measure the separation between the test masses with sensitivity of 30 pm/sqrt(Hz) at 10 mHz. The readout scheme is described, error sources are analyzed, and experimental results are presented.
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