부산대학교 도서관

Frequency Domain Reflectometry (FDR) is a nondestructive and non-intrusive technology and is widely used to maintain coaxial cables and antennas. In this work, FDR was expanded to maintain anchor rods. Such rods are buried in soil to provide fixed support for multiple buildings (such as power transmission towers). Transmission line theory is used to detect and locate wear in metal structures. A high-frequency connector called MDSC (Microwave Device for Support and Connection) was previously designed to allow electromagnetic waves to propagate on two rods, one of which is the rod under test. Tests were performed by applying FDR to two rods manufactured with different fault locations. The results show the efficiency of using this technology to perform preventive maintenance and effectively locate failures on the rods. In addition, the measurement results have been reproduced in a simulation software. Both measured and simulated results are compared with each other and the difference between them is up to 11.24% of Voltage Standing Wave Ratio (VSWR).