Detecting Infrastructures Using GPR And Tomography Techniques

• Main Authors: Gin-Lon Dan, 鄧景龍
• Other Authors: Chieh-Hou Yang
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/30689993234109636984

碩士 === 國立中央大學 === 應用地質研究所 === 88 === Tomography is an image technique which generates a cross sectional picture of an object by utilizing the object’s response to the nondestructive, probing energy of an external source. Nowadays the theories and techniques of tomography have been well developed and applied to a number of fields such as Geophysics and Medicine. However, this technique is not well applied in Ground Penetrating Radar method (GPR). Therefore, the feasibility of detecting civil infrastructures by combined the GPR and tomography methods are being evaluated. Three steps involved in the testing of the cement concrete samples with different width of the crack; first, GPR tomographic sounding with different deploying of antenna or different sampling points is being studied. Second, the fractures of the sample are also inspected by reflection GPR survey. The difference between the tomography and reflection results can be recognized. Final, a field test is carried on a R.C. pillar by using both tomography and reflection GPR surveys. The distribution of the steel rabars is recognized. It indicates that the tomographic GPR has great potential for non-destructive inspection of infrastructure.