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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/36543

Title: Identification of popelines from the secondary reflect wave travel time of ground penetrating radar waves
Authors: Lee;K. F.;T. K. Wang;Y. M. Kang;C. S. Wang;K. A. Lin
Contributors: NTOU:Institute of Applied Geosciences
Keywords: GPR;travel time;dielectric constants
Date: 2013
Issue Date: 2015-05-19T06:26:01Z
Publisher: Journal of Marine Science and Technology
Abstract: When using ground-penetrating radar to identify underground pipelines of similar dielectric constants (i.e. PE and PVC), misidentification is quite common. In this study, we apply reflected travel time of radar waves into the PE- and PVC- dielectric constants and the differentiation becomes possible. We have conducted the experiments using the nonmetal PE- and PVC- pipelines as well as the heavy metal (iron) pipelines in a water environment. Based on a travel- time calculation, the dielectric constants of non-metal pipelines with similar omposition (PE = 2.3 and PVC = 3.0) were quite close. The error between the experimental and theoretical values is acceptable in general engineering projects.
It is also compliant with the standard error by the U.S. ASTMD4748-98 (the error range is about ± 0.2 inches or ± 0.508 cm). Therefore, the result of this study not only can be applied to detect the metal pipes, but also may be used to distinguish non-metallic pipes in a water environment.
Relation: 21(4), pp.417-422
URI: http://ntour.ntou.edu.tw/handle/987654321/36543
Appears in Collections:[應用地球科學研究所] 期刊論文

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