Volume 29, Issue 4 (July 2006)

    Development of TDR Penetrometer Through Theoretical and Laboratory Investigations: 1. Measurement of Soil Dielectric Permittivity

    (Received 10 March 2005; accepted 30 March 2006)

    Published Online: 2006

    CODEN: GTJOAD

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    Abstract

    To better characterize a bulk soil electrically, both the electrical conductivity and dielectric permittivity should be measured. This study developed a time domain reflectometry (TDR) penetrometer to allow simultaneous measurements of dielectric permittivity and electrical conductivity during cone penetration. A TDR penetrometer is formed by placing a multiple-conductor waveguide around a nonconducting shaft. Probe design considerations and calibration methods for measuring dielectric constant were first theoretically discussed and then evaluated through laboratory investigations. A prototype TDR penetrometer was fabricated and used to perform simulated penetration tests in a calibration chamber. The effect of penetration disturbance on dielectric constant is quantitatively reported and explained. The implications of the data that can be measured by the TDR penetrometer are also discussed.


    Author Information:

    Lin, CP
    Associate Professor and Graduate Students, Civil Engineering, National Chiao Tung University, Hsinchu,

    Tang, SH
    Associate Professor and Graduate Students, Civil Engineering, National Chiao Tung University, Hsinchu,

    Chung, CC
    Associate Professor and Graduate Students, Civil Engineering, National Chiao Tung University, Hsinchu,


    Stock #: GTJ14093

    ISSN: 0149-6115

    DOI: 10.1520/GTJ14093

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    Author
    Title Development of TDR Penetrometer Through Theoretical and Laboratory Investigations: 1. Measurement of Soil Dielectric Permittivity
    Symposium , 0000-00-00
    Committee D18