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Interferometric sensing of a commercial geophone

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arxiv 2109.03147 v1 pith:DTLBBBI6 submitted 2021-09-07 physics.ins-det astro-ph.IM

S. J. Cooper , C. J. Collins , L. Prokhorov , J. Warner , D. Hoyland , C. M. Mow-Lowry This is my paper · ORCID
classification physics.ins-detastro-ph.IM
keywords vibrationcommercialfrequenciesgeophoneinterferometricisolationlowermodified
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We present a modified commercial L-4C geophone with interferometric readout that demonstrated a resolution 60 times lower than the included coil-magnet readout at low frequencies. The intended application for the modified sensor is in vibration isolation platforms that require improved performance at frequencies lower than 1 Hz. A controls and noise-model of an Advanced LIGO 'HAM-ISI' vibration isolation system was developed, and it shows that our sensor can reduce the residual vibration by a factor of 70 at 0.1 Hz

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