A compact, large-range interferometer for precision measurement and inertial sensing
S. J. Cooper, A. C. Green, C. Collins, D. Hoyland, C. C. Speake, A., Freise, C. M. Mow-Lowry

TL;DR
This paper introduces a compact, fibre-coupled interferometer with high sensitivity and large range, suitable for inertial sensing and precision positioning, capable of reducing noise sources in these applications.
Contribution
The paper presents a novel, compact interferometer design that enhances sensitivity and range, and proposes its use as a readout for inertial sensors to improve measurement accuracy.
Findings
Peak sensitivity of 2×10^{-14} m/√Hz at 70 Hz
Sensitivity of 8×10^{-11} m/√Hz at 10 mHz
Inertial sensing dominated by suspension thermal noise from 50 mHz to 2 Hz
Abstract
We present a compact, fibre-coupled interferometer with high sensitivity and a large working range. We propose to use this interferometer as a readout mechanism for future inertial sensors, removing a major limiting noise source, and in precision positioning systems. The interferometers peak sensitivity is m/ at 70 Hz and m/ at 10 mHz. If deployed on a GS-13 geophone, the resulting inertial sensing output will be dominated by suspension thermal noise from 50 mHz to 2 Hz.
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