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README.txt

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http://eprints.org/relation/isVersionOf https://researchdata.gla.ac.uk/id/document/706 http://eprints.org/relation/isVolatileVersionOf https://researchdata.gla.ac.uk/id/document/706 http://eprints.org/relation/isIndexCodesVersionOf https://researchdata.gla.ac.uk/id/document/706 archive 5 disk0/00/00/02/02 2016-02-23 12:24:32 2026-03-16 09:15:17 2016-03-29 14:26:28 data_collection show Leavey Sean 35220 0000-0001-8253-0272 Danilishin S. L. Gläfke A. Barr B. W. 3053 Gräf C. Hennig J.-S. Houston E. A. Lück H. Pascucci D. Somiya K. Spencer A. 36610 Steinlechner Sebastian 31341 Strain Kenneth 8012 0000-0002-2066-5355 WRIGHT Jennifer 40293 Zhang Teng 42303 Hild Stefan 12325 glaresearchdata:2016-03-28-202 unpub 30601200 The Sagnac speed meter interferometer topology can potentially provide enhanced sensitivity to gravitational waves in the audio-band compared to equivalent Michelson interferometers. A challenge with the Sagnac speed meter interferometer arises from the intrinsic lack of sensitivity at low frequencies where the velocity-proportional signal is smaller than the noise associated with the sensing of the signal. Using as an example the on-going proof-of-concept Sagnac speed meter experiment in Glasgow, we quantify the problem and present a solution involving the extraction of a small displacement-proportional signal. This displacement signal can be combined with the existing velocity signal to enhance low frequency sensitivity, and we derive optimal filters to accomplish this for different signal strengths. We show that the extraction of the displacement signal for low frequency control purposes can be performed without reducing significantly the quantum non-demolition character of this type of interferometer. 2016-03-28 University of Glasgow 10.5525/gla.researchdata.202 Code Text European Research Council (ERC) ERC-2012-Stg-30 62434 1 Investigations in Gravitational Radiation / Particle Astrophysics Capital equipment Sheila Rowan Science & Technologies Facilities Council (STFC) ST/L000946/1 S&E P&A - PHYSICS & ASTRONOMY 61954 1 STFC Doctoral Training Grant 2012-17 Martin Hendry Science & Technologies Facilities Council (STFC) ST/K502005/1 S&E P&A - PHYSICS & ASTRONOMY FALSE en https://arxiv.org/abs/1603.07756 preprint 2036-02-29 R 2026-03-16 AA Original retention date 2026-03-28. Extended to 10 years from date of last access. FALSE FALSE