Interferometric sensing of a commercial geophone. (7th April 2022)

• Record Type: Journal Article
• Authors: Cooper, S J; Collins, C J; Prokhorov, L; Warner, J; Hoyland, D; Mow-Lowry, C M
• Is Part Of: Classical and quantum gravity. Volume 39:Number 7(2022)
• Publication Date: 2022-04-07
• Subjects: interferometry -- inertial sensing -- homodyne detection; Quantum gravity -- Periodicals; Gravitation -- Periodicals; Relativity (Physics) -- Periodicals; Space and time -- Periodicals; Periodicals; 521.1
• DOI: 10.1088/1361-6382/ac595c
• Languages: English
• ISSNs: 0264-9381

Abstract

Abstract: We present a modified commercial L-4C geophone with interferometric readout that demonstrates 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. To illustrate it's application a controls- and noise-model of an Advanced LIGO 'HAM-ISI' vibration isolation system was developed, and shows that our sensor can reduce the residual motion of the platforms by a factor of 70 at 0.1 Hz.