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Volume 41 Issue 7
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CHEN Ren-peng, CHEN Zhuo, LU Ming, LIU Hui-bin, WANG Chen-guang, LU Yu. Development of TDR based on stepped-frequency principle and its application in measurement of volumetric water content of soils[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(7): 1191-1199. DOI: 10.11779/CJGE201907002
Citation: CHEN Ren-peng, CHEN Zhuo, LU Ming, LIU Hui-bin, WANG Chen-guang, LU Yu. Development of TDR based on stepped-frequency principle and its application in measurement of volumetric water content of soils[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(7): 1191-1199. DOI: 10.11779/CJGE201907002
shu

Development of TDR based on stepped-frequency principle and its application in measurement of volumetric water content of soils

  • 1. MOE Key Laboratory of Building Safety and Energy Efficiency, Hunan University, Changsha 410082, China;
    2. National Joint Research Center for Building Safety and Environment, Hunan University, Changsha 410082, China;
    3. College of Civil Engineering, Hunan University, Changsha 410082, China;
    4. Tianjin Telepro Science Technology Co., Ltd., Tianjin 300384, China

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  • Received Date: July 18, 2018
  • Published Date: July 24, 2019
    Graphical Abstract
    • Abstract
  • The time-domain reflection method (TDR) based on the time-domain carrier-free pulse principle can test volumetric water content of soils timely and accurately and is widely applied in geotechnical engineering. But all the TDR testing instruments are imported at present, and some foreign countries implement blockade on the techniques. A set of TDR system based on the principle of stepped-frequency is recommended. The output frequency component of the signal source can be accurately known and the noise in the received signal can be effectively restrained. A reasonable probe converter is developed to avoid blind spots in normal testing area and to improve testing range and accuracy. Finally, the effectiveness of the new TDR testing equipment is verified by comparing the volumetric water contents of water, air and soil.
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    • References (24)
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