Advances in Thermo-Time Domain Reflectometry Technique: Measuring Ice Content in Partially Frozen Soils

2019 ◽  
Vol 4 (1) ◽  
pp. 0 ◽  
Author(s):  
Zhengchao Tian ◽  
Yuki Kojima ◽  
Joshua L. Heitman ◽  
Robert Horton ◽  
Tusheng Ren
Keyword(s):  
Time Domain ◽  
Time Domain Reflectometry ◽  
Frozen Soils ◽  
Ice Content

scholarly journals Advances in thermo‐time domain reflectometry technique: Measuring ice content in partially frozen soils

2020 ◽  
Vol 84 (5) ◽  
pp. 1519-1526
Author(s):  
Zhengchao Tian ◽  
Yuki Kojima ◽  
Joshua L. Heitman ◽  
Robert Horton ◽  
Tusheng Ren
Keyword(s):  
Time Domain ◽  
Time Domain Reflectometry ◽  
Frozen Soils ◽  
Ice Content

scholarly journals A new thermo-time domain reflectometry approach to quantify soil ice content at temperatures near the freezing point

2020 ◽  
Vol 174 ◽  
pp. 103060 ◽  
Author(s):  
Yuki Kojima ◽  
Yuta Nakano ◽  
Chihiro Kato ◽  
Kosuke Noborio ◽  
Kohji Kamiya ◽  
...  
Keyword(s):  
Time Domain ◽  
Freezing Point ◽  
Time Domain Reflectometry ◽  
Ice Content ◽  
Soil Ice Content

The measurement of unfrozen water content by time domain reflectometry: results from laboratory tests

1981 ◽  
Vol 18 (1) ◽  
pp. 131-144 ◽  
Author(s):  
D. E. Patterson ◽  
M. W. Smith
Keyword(s):  
Dielectric Property ◽  
Water Content ◽  
Time Domain ◽  
Empirical Relationship ◽  
Time Domain Reflectometry ◽  
Unfrozen Water ◽  
Published Data ◽  
Frozen Soils ◽  
Unfrozen Water Content ◽  
Property Versus

A new technique for determining the volumetric unfrozen water content of frozen soils is reported, which uses time domain reflectometry (TDR) to measure the dielectric property. Using precise temperature control, the technique, which was developed previously by others for unfrozen soils, has been successfully applied to the measurement of unfrozen water contents of frozen soils. Curves of the dielectric property versus temperature show a close similarity to unfrozen water content curves, for a variety of soils. Results from experiments on ice–water mixtures and from combined TDR–dilatometry experiments on frozen soils suggest that an empirical relationship obtained by Topp, Davis, and Annan may be applicable to frozen media as well as unfrozen soils. Using this relationship, dielectric values were converted to unfrozen water content values, and the results agreed very closely with published data for similar soils, determined by other methods. For silt loams, agreement is typically within ± 1½% in volumetric water content, and for clays ± 3 %. Some of this difference is undoubtedly due to soil sample variations.

scholarly journals Applications of Thermo-TDR Sensors for Soil Physical Measurements

2021 ◽  
Author(s):  
Yili Lu ◽  
Wei Peng ◽  
Tusheng Ren ◽  
Robert Horton
Keyword(s):  
Electrical Properties ◽  
Time Domain ◽  
Structural Parameters ◽  
Time Domain Reflectometry ◽  
State Variables ◽  
Physical Measurements ◽  
Bulk Electrical Conductivity ◽  
Potential Applications ◽  
Thermal And Electrical Properties ◽  
Ice Content

Advanced sensors provide new opportunities to improve the understanding of soil properties and processes. One such sensor is the thermo-TDR sensor, which combines the functions of heat pulse probes and time domain reflectometry probes. Recent advancements in fine-scale measurements of soil thermal, hydraulic, and electrical properties with the thermo-TDR sensor enable measuring soil state variables (temperature, water content, and ice content), thermal and electrical properties (thermal diffusivity, heat capacity, thermal conductivity, and bulk electrical conductivity), structural parameters (bulk density and air-filled porosity) and fluxes (heat, water, and vapor) simultaneously. This chapter describes the theory, methodology, and potential applications of the thermo-TDR technique.

An improved thermo-time domain reflectometry method for determination of ice contents in partially frozen soils

2017 ◽  
Vol 555 ◽  
pp. 786-796 ◽  
Author(s):  
Zhengchao Tian ◽  
Tusheng Ren ◽  
Yuki Kojima ◽  
Yili Lu ◽  
Robert Horton ◽  
...  
Keyword(s):  
Time Domain ◽  
Time Domain Reflectometry ◽  
Frozen Soils

Advanced Non-Destructive Fault Isolation Techniques for PCB Substrates Using Magnetic Current Imaging and Terahertz Time Domain Reflectometry

2018 ◽  
Author(s):  
Daechul Choi ◽  
Yoonseong Kim ◽  
Jongyun Kim ◽  
Han Kim
Keyword(s):  
Time Domain ◽  
Quantum Interference ◽  
Flip Chip ◽  
Imaging System ◽  
Time Domain Reflectometry ◽  
Fault Isolation ◽  
Magnetic Current ◽  
Isolation Techniques ◽  
Super Conducting ◽  
Non Destructive

Abstract In this paper, we demonstrate cases for actual short and open failures in FCB (Flip Chip Bonding) substrates by using novel non-destructive techniques, known as SSM (Scanning Super-conducting Quantum Interference Device Microscopy) and Terahertz TDR (Time Domain Reflectometry) which is able to pinpoint failure locations. In addition, the defect location and accuracy is verified by a NIR (Near Infra-red) imaging system which is also one of the commonly used non-destructive failure analysis tools, and good agreement was made.

Sign in / Sign up

Export Citation Format

Share Document