A vertical inertial sensor with interferometric readout
S.L. Kranzhoff, J. Lehmann, R. Kirchhoff, M. Carlassara, S.J. Cooper,, P. Koch, S. Leavey, H. Lueck, C.M. Mow-Lowry, J. Woehler, J. von Wrangel,, D.S. Wu

TL;DR
This paper introduces a high-sensitivity vertical inertial sensor with interferometric readout, capable of detecting ground motion at very low frequencies, which could improve seismic isolation in gravitational-wave detectors.
Contribution
The paper presents a novel interferometric vertical inertial sensor with low noise and large dynamic range, enhancing seismic sensing capabilities for gravitational-wave detection.
Findings
Sensitivity of 10^{-10} m/√Hz at 100 mHz
Sensitivity of 10^{-12} m/√Hz at 1 Hz
Potential two orders of magnitude improvement over geophones
Abstract
High precision interferometers such as gravitational-wave detectors require complex seismic isolation systems in order to decouple the experiment from unwanted ground motion. Improved inertial sensors for active isolation potentially enhance the sensitivity of existing and future gravitational-wave detectors, especially below 30 Hz, and thereby increase the range of detectable astrophysical signals. This paper presents a vertical inertial sensor which senses the relative motion between an inertial test mass suspended by a blade spring and a seismically isolated platform. An interferometric readout was used which introduces low sensing noise, and preserves a large dynamic range due to fringe-counting. The expected sensitivity is comparable to other state-of-the-art interferometric inertial sensors and reaches values of at 100 mHz and…
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Taxonomy
TopicsStructural Health Monitoring Techniques · Geophysics and Gravity Measurements · Pulsars and Gravitational Waves Research
