Details
| Originalsprache | Englisch |
|---|---|
| Aufsatznummer | 015007 |
| Seitenumfang | 18 |
| Fachzeitschrift | Classical and quantum gravity |
| Jahrgang | 40 |
| Ausgabenummer | 1 |
| Frühes Online-Datum | 5 Dez. 2022 |
| Publikationsstatus | Veröffentlicht - 5 Jan. 2023 |
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 10 − 10 m ( H z 1 / 2 ) − 1 at 100 mHz and 10 − 12 m ( H z 1 / 2 ) − 1 at 1 Hz. The potential sensitivity improvement compared to commercial L-4C geophones is shown to be about two orders of magnitude at 10 mHz and 100 mHz and one order of magnitude at 1 Hz. The noise performance is expected to be limited by thermal noise of the inertial test mass suspension below 10 Hz. Further performance limitations of the sensor, such as tilt-to-vertical coupling from a non-perfect levelling of the test mass and nonlinearities in the interferometric readout, are also quantified and discussed.
ASJC Scopus Sachgebiete
- Physik und Astronomie (insg.)
- Physik und Astronomie (sonstige)
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in: Classical and quantum gravity, Jahrgang 40, Nr. 1, 015007, 05.01.2023.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - A vertical inertial sensor with interferometric readout
AU - Kranzhoff, S. Luise
AU - Lehmann, Johannes
AU - Kirchhoff, Robin
AU - Carlassara, Mateo
AU - Cooper, S. J.
AU - Koch, P.
AU - Leavey, S.
AU - Lück, H.
AU - Mow-Lowry, C. M.
AU - Wöhler, Janis
AU - von Wrangel, Juliane
AU - Wu, D. S.
N1 - Funding Information: The authors are grateful for the support from the International Max Planck Research School (IMPRS) on Gravitational Wave Astronomy, QUEST, the Center for Quantum Engineering and Space-Time Research and Quantum Frontiers. Funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy—EXC-2123 QuantumFrontiers—390837967. The authors would like to thank D Hoyland from University of Birmingham for providing schematics for the HoQI readout electronics.
PY - 2023/1/5
Y1 - 2023/1/5
N2 - 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 10 − 10 m ( H z 1 / 2 ) − 1 at 100 mHz and 10 − 12 m ( H z 1 / 2 ) − 1 at 1 Hz. The potential sensitivity improvement compared to commercial L-4C geophones is shown to be about two orders of magnitude at 10 mHz and 100 mHz and one order of magnitude at 1 Hz. The noise performance is expected to be limited by thermal noise of the inertial test mass suspension below 10 Hz. Further performance limitations of the sensor, such as tilt-to-vertical coupling from a non-perfect levelling of the test mass and nonlinearities in the interferometric readout, are also quantified and discussed.
AB - 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 10 − 10 m ( H z 1 / 2 ) − 1 at 100 mHz and 10 − 12 m ( H z 1 / 2 ) − 1 at 1 Hz. The potential sensitivity improvement compared to commercial L-4C geophones is shown to be about two orders of magnitude at 10 mHz and 100 mHz and one order of magnitude at 1 Hz. The noise performance is expected to be limited by thermal noise of the inertial test mass suspension below 10 Hz. Further performance limitations of the sensor, such as tilt-to-vertical coupling from a non-perfect levelling of the test mass and nonlinearities in the interferometric readout, are also quantified and discussed.
KW - active seismic isolation
KW - gravitational wave detection
KW - homodyne detection
KW - inertial sensing
KW - interferometry
UR - http://www.scopus.com/inward/record.url?scp=85144410976&partnerID=8YFLogxK
U2 - 10.48550/arXiv.2208.09320
DO - 10.48550/arXiv.2208.09320
M3 - Article
AN - SCOPUS:85144410976
VL - 40
JO - Classical and quantum gravity
JF - Classical and quantum gravity
SN - 0264-9381
IS - 1
M1 - 015007
ER -