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Sensors 2019, 19(6), 1297; https://doi.org/10.3390/s19061297

Using a Parallel Helical Sensing Cable for the Distributed Measurement of Ground Deformation

1
School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China
2
College of Mechanical and Electrical Engineering, China Jiliang University, Hangzhou, 310018, China
*
Author to whom correspondence should be addressed.
Received: 30 January 2019 / Revised: 4 March 2019 / Accepted: 11 March 2019 / Published: 14 March 2019
(This article belongs to the Section Physical Sensors)
PDF [1059 KB, uploaded 14 March 2019]   |   Review Reports

Abstract

Surface and underground stretched deformation is one of the most important physical measurement quantities for geological-disaster monitoring. In this study, a parallel helical sensing cable (PHSC) based on the time–domain reflectometry (TDR) technique is proposed and used to monitor large ground stretched deformation. First, the PHSC structure and manufacturing process are introduced, and then, distributed capacitance, distributed inductance, and characteristic impedance were derived based on the proposed stretched-structure model. Next, the relationship between characteristic impedance and stretched deformation was found, and the principle of distributed deformation measurement based on the TDR technique and PHSC characteristic impedance was analyzed in detail. The function of the stretched deformation and characteristic impedance was obtained by curve fitting based on the theoretically calculated results. A laboratory calibration test was carried out by the designed tensile test platform. The results of multi-point positioning and the amount of stretched deformation are presented by the tensile test platform, multi-point positioning measurement absolute errors were less than 0.01 m, and the amount of stretched deformation measurement absolute errors were less than 3 mm, respectively. The measured results are in good agreement with the theoretically calculated results, which verify the correctness of theoretical derivation and show that a PHSC is very suitable for the distributed measurement of the ground stretched deformation.
Keywords: geological monitoring; parallel helical sensing cable; time–domain reflectometry (TDR); distributed parameter; characteristic impedance; stretched deformation geological monitoring; parallel helical sensing cable; time–domain reflectometry (TDR); distributed parameter; characteristic impedance; stretched deformation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wu, X.; Tong, R.; Wang, Y.; Mei, C.; Li, Q. Using a Parallel Helical Sensing Cable for the Distributed Measurement of Ground Deformation. Sensors 2019, 19, 1297.

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