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- W751434624 abstract "Ground penetrating radar (GPR) is a non-destructive continuous detection technique, with wide applications in pavement condition evaluation, soil property characterization, and underground object detection. GPR technique is based on the measurement of travel time and reflection amplitude of a short electromagnetic (EM) pulse transmitted through the medium, which is a function of the medium properties: dielectric constant, conductivity, thickness and moisture content. Generally dielectric constant is estimated by using the surface reflectivity information. But for a ground coupling GPR, the method based on the surface reflectivity is not applicable. Most GPR thickness measurement is based on the priori knowledge of the dielectric constant of the pavement materials. However, the changes in pavement materials and moisture conditions make the fixed dielectric constant method inaccurate. In this paper, a new method to measure pavement dielectric constant accurately by ground coupling GPR is introduced. Such measurement is based on the time shift between the air wave and the underground surface wave. The existence of the underground surface wave has not been used in the GPR applications. In this paper, the existence of such underground surface wave is explained physically and verified by numerical simulation results. Also the application condition of this method and relationship with pavement structure are discussed. Finally, applications and field test results for pavement evaluation are presented." @default.
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- W751434624 date "2006-01-01" @default.
- W751434624 modified "2023-09-26" @default.
- W751434624 title "New Method for Pavement Dielectric Constant Measurement Using Ground-Penetrating Radar" @default.
- W751434624 hasPublicationYear "2006" @default.
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