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Modeling and Analysis of the Noise Performance of the Capacitive Sensing Circuit with a Differential Transformer

Capacitive sensing is a key technique to measure the test mass movement with a high resolution for space-borne gravitational wave detectors, such as Laser Interferometer Space Antenna (LISA) and TianQin. The capacitance resolution requirement of TianQin is higher than that of LISA, as the arm length...

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Autores principales: Xie, Yafei, Fan, Ji, Zhao, Chun, Yan, Shitao, Hu, Chenyuan, Tu, Liangcheng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6562533/
https://www.ncbi.nlm.nih.gov/pubmed/31096645
http://dx.doi.org/10.3390/mi10050325
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author Xie, Yafei
Fan, Ji
Zhao, Chun
Yan, Shitao
Hu, Chenyuan
Tu, Liangcheng
author_facet Xie, Yafei
Fan, Ji
Zhao, Chun
Yan, Shitao
Hu, Chenyuan
Tu, Liangcheng
author_sort Xie, Yafei
collection PubMed
description Capacitive sensing is a key technique to measure the test mass movement with a high resolution for space-borne gravitational wave detectors, such as Laser Interferometer Space Antenna (LISA) and TianQin. The capacitance resolution requirement of TianQin is higher than that of LISA, as the arm length of TianQin is about 15 times shorter. In this paper, the transfer function and capacitance measurement noise of the circuit are modeled and analyzed. Figure-of-merits, including the product of the inductance L and the quality factor Q of the transformer, are proposed to optimize the transformer and the capacitance measurement resolution of the circuit. The LQ product improvement and the resonant frequency augmentation are the key factors to enhance the capacitance measurement resolution. We fabricated a transformer with a high LQ product over a wide frequency band. The evaluation showed that the transformer can generate a capacitance resolution of 0.11 aF/Hz(1/2) at a resonant frequency of 200 kHz, and the amplitude of the injection wave would be 0.6 V. This result supports the potential application of the proposed transformer in space-borne gravitational wave detection and demonstrates that it could relieve the stringent requirements for other parameters in the TianQin mission.
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spelling pubmed-65625332019-06-17 Modeling and Analysis of the Noise Performance of the Capacitive Sensing Circuit with a Differential Transformer Xie, Yafei Fan, Ji Zhao, Chun Yan, Shitao Hu, Chenyuan Tu, Liangcheng Micromachines (Basel) Article Capacitive sensing is a key technique to measure the test mass movement with a high resolution for space-borne gravitational wave detectors, such as Laser Interferometer Space Antenna (LISA) and TianQin. The capacitance resolution requirement of TianQin is higher than that of LISA, as the arm length of TianQin is about 15 times shorter. In this paper, the transfer function and capacitance measurement noise of the circuit are modeled and analyzed. Figure-of-merits, including the product of the inductance L and the quality factor Q of the transformer, are proposed to optimize the transformer and the capacitance measurement resolution of the circuit. The LQ product improvement and the resonant frequency augmentation are the key factors to enhance the capacitance measurement resolution. We fabricated a transformer with a high LQ product over a wide frequency band. The evaluation showed that the transformer can generate a capacitance resolution of 0.11 aF/Hz(1/2) at a resonant frequency of 200 kHz, and the amplitude of the injection wave would be 0.6 V. This result supports the potential application of the proposed transformer in space-borne gravitational wave detection and demonstrates that it could relieve the stringent requirements for other parameters in the TianQin mission. MDPI 2019-05-15 /pmc/articles/PMC6562533/ /pubmed/31096645 http://dx.doi.org/10.3390/mi10050325 Text en © 2019 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Xie, Yafei
Fan, Ji
Zhao, Chun
Yan, Shitao
Hu, Chenyuan
Tu, Liangcheng
Modeling and Analysis of the Noise Performance of the Capacitive Sensing Circuit with a Differential Transformer
title Modeling and Analysis of the Noise Performance of the Capacitive Sensing Circuit with a Differential Transformer
title_full Modeling and Analysis of the Noise Performance of the Capacitive Sensing Circuit with a Differential Transformer
title_fullStr Modeling and Analysis of the Noise Performance of the Capacitive Sensing Circuit with a Differential Transformer
title_full_unstemmed Modeling and Analysis of the Noise Performance of the Capacitive Sensing Circuit with a Differential Transformer
title_short Modeling and Analysis of the Noise Performance of the Capacitive Sensing Circuit with a Differential Transformer
title_sort modeling and analysis of the noise performance of the capacitive sensing circuit with a differential transformer
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6562533/
https://www.ncbi.nlm.nih.gov/pubmed/31096645
http://dx.doi.org/10.3390/mi10050325
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