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Using DWS Optical Readout to Improve the Sensitivity of Torsion Pendulum

In space gravitational wave detection missions, a drag-free system is used to keep the test mass (TM) free-falling in an ultralow-noise environment. Ground verification experiments should be carried out to clarify the shielding and compensating capabilities of the system for multiple stray force noi...

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Autores principales: Wang, Shaoxin, Liu, Heshan, Dai, Lei, Luo, Ziren, Xu, Peng, Li, Pan, Gao, Ruihong, Li, Dayu, Qi, Keqi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10575363/
https://www.ncbi.nlm.nih.gov/pubmed/37836917
http://dx.doi.org/10.3390/s23198087
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author Wang, Shaoxin
Liu, Heshan
Dai, Lei
Luo, Ziren
Xu, Peng
Li, Pan
Gao, Ruihong
Li, Dayu
Qi, Keqi
author_facet Wang, Shaoxin
Liu, Heshan
Dai, Lei
Luo, Ziren
Xu, Peng
Li, Pan
Gao, Ruihong
Li, Dayu
Qi, Keqi
author_sort Wang, Shaoxin
collection PubMed
description In space gravitational wave detection missions, a drag-free system is used to keep the test mass (TM) free-falling in an ultralow-noise environment. Ground verification experiments should be carried out to clarify the shielding and compensating capabilities of the system for multiple stray force noises. A hybrid apparatus was designed and analyzed based on the traditional torsion pendulum, and a technique for enhancing the sensitivity of the torsion pendulum system by employing the differential wavefront sensing (DWS) optical readout was proposed. The readout resolution experiment was then carried out on an optical bench that was designed and established. The results indicate that the angular resolution of the DWS signal in optical readout mode can reach the level of 10 nrad/Hz(1/2) over the full measurement band. Compared with the autocollimator, the sensitivity of the torsional pendulum is noticeably improved, and the background noise is expected to reach 4.5 × 10(−15) Nm/Hz(1/2)@10 mHz. This method could also be applied to future upgrades of similar systems.
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spelling pubmed-105753632023-10-14 Using DWS Optical Readout to Improve the Sensitivity of Torsion Pendulum Wang, Shaoxin Liu, Heshan Dai, Lei Luo, Ziren Xu, Peng Li, Pan Gao, Ruihong Li, Dayu Qi, Keqi Sensors (Basel) Article In space gravitational wave detection missions, a drag-free system is used to keep the test mass (TM) free-falling in an ultralow-noise environment. Ground verification experiments should be carried out to clarify the shielding and compensating capabilities of the system for multiple stray force noises. A hybrid apparatus was designed and analyzed based on the traditional torsion pendulum, and a technique for enhancing the sensitivity of the torsion pendulum system by employing the differential wavefront sensing (DWS) optical readout was proposed. The readout resolution experiment was then carried out on an optical bench that was designed and established. The results indicate that the angular resolution of the DWS signal in optical readout mode can reach the level of 10 nrad/Hz(1/2) over the full measurement band. Compared with the autocollimator, the sensitivity of the torsional pendulum is noticeably improved, and the background noise is expected to reach 4.5 × 10(−15) Nm/Hz(1/2)@10 mHz. This method could also be applied to future upgrades of similar systems. MDPI 2023-09-26 /pmc/articles/PMC10575363/ /pubmed/37836917 http://dx.doi.org/10.3390/s23198087 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Wang, Shaoxin
Liu, Heshan
Dai, Lei
Luo, Ziren
Xu, Peng
Li, Pan
Gao, Ruihong
Li, Dayu
Qi, Keqi
Using DWS Optical Readout to Improve the Sensitivity of Torsion Pendulum
title Using DWS Optical Readout to Improve the Sensitivity of Torsion Pendulum
title_full Using DWS Optical Readout to Improve the Sensitivity of Torsion Pendulum
title_fullStr Using DWS Optical Readout to Improve the Sensitivity of Torsion Pendulum
title_full_unstemmed Using DWS Optical Readout to Improve the Sensitivity of Torsion Pendulum
title_short Using DWS Optical Readout to Improve the Sensitivity of Torsion Pendulum
title_sort using dws optical readout to improve the sensitivity of torsion pendulum
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10575363/
https://www.ncbi.nlm.nih.gov/pubmed/37836917
http://dx.doi.org/10.3390/s23198087
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