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- W606797504 abstract "i Abstract Metal pipes are used widely in industry. During recent twenty years, accidents caused by pipe wall thinning (PWT) have been reported frequently all over the world. PWT is one of the most serious defects in the pipes used in industry. Efficiently detecting and quantitatively evaluating the PWT locations and degrees (lengths and depths) in these pipes, especially for long-distance pipes, are mandatory for effective maintenance and lifetime prediction of the pipelines in order to avoid severe economical and social damages. This research aims to find an efficient, nondestructive and quantitative way of detecting the locations and degrees of PWT in a long-distance metal pipe. Since a conductive pipe (such as a metal pipe) can be taken as a circular waveguide of microwaves, microwave signals can propagate a long distance with low attenuation in the pipe. Meanwhile, a wavelength, group velocity, and wave impedance change will occur at the PWT section. When building up a resonance structure concerning the wavelength changes at the PWT section in the pipe under test (PUT), frequency domain measurement (FDM) of microwave signals is adopted to evaluate the PWT degrees (depths). When considering the time of flight (TOF) of microwave signals propagating in the PUT and that reflected from the PWT section, time domain measurement (TDM) of signals is adopted to evaluate the PWT locations and lengths (a length is obtained from the difference of the evaluated locations of the start and end points of a PWT section). To carry out the FDM and TDM, a microwave vector network analyzer (VNA) was employed and a pair of coaxial-line sensors was designed to generate microwave signals propagating in the pipe. The two coaxial-line sensors were utilized separately with the VNA working at S12 or S11 mode. A VNA can realize the FDM of microwave signals directly, and the TDM results are obtained from inverse fast Fourier transform (IFFT) of" @default.
- W606797504 created "2016-06-24" @default.
- W606797504 creator A5028315031 @default.
- W606797504 date "2012-03-26" @default.
- W606797504 modified "2023-09-24" @default.
- W606797504 title "Nondestructive measurement and quantitative evaluation of wall thinning in a long-distance metal pipe using microwaves" @default.
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