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Open AccessArticle

Design of a Carrier Wave for Capacitive Transducer with Large Dynamic Range

TianQin Research Center for Gravitational Physics and School of Physics and Astronomy, Sun Yat-sen University (Zhuhai Campus), Zhuhai 519082, China
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Sensors 2020, 20(4), 992; https://doi.org/10.3390/s20040992 (registering DOI)
Received: 17 January 2020 / Revised: 8 February 2020 / Accepted: 11 February 2020 / Published: 12 February 2020
(This article belongs to the Section Physical Sensors)
Capacitive transducers are widely used in fundamental physics experiments, seismology, Earth or planetary observations, and space scientific and technical applications because of their high precision, simple structure, and compatibility with various measurements. However, in real applications, there is a trade-off between their resolution and dynamic range. Therefore, this paper is aimed at enlarging the dynamic range while ensuring high resolution. In this paper, a noise analysis of a capacitive transducer is presented, which shows that the amplitude noise of the carrier wave is the main limiting factor. Hence, a new method of generating a carrier wave with lower-amplitude noise is proposed in the paper. Based on the experimental verification, it is found that the carrier wave produced through the new method performed significantly better than the typical digital carrier wave when they were compared in the same sensing circuit. With the carrier wave produced through the new method, the dynamic range of the capacitive transducer can reach 120.7 dB, which is 18.3 dB greater than for the typical direct digital synthesis (DDS) method. In addition, the resolution of the carrier wave is mainly limited by the voltage reference components. View Full-Text
Keywords: capacitive transducer; carrier wave; dynamic range; displacement measurement capacitive transducer; carrier wave; dynamic range; displacement measurement
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Li, Z.; Zhang, X.; Zou, S.; Huang, X.; Xue, C.; Liu, J.; Liu, Q.; Yang, S.; Tu, L. Design of a Carrier Wave for Capacitive Transducer with Large Dynamic Range. Sensors 2020, 20, 992.

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