Abstract
Metallic piping in chemical plants has been used for a long term. In order to prevent serious accident, inspection techniques for maintenance are very important. This report presents a new technique to detect deformation of metallic piping using characteristics of electromagnetic wave propagation. In this method, metallic piping is considered as a electromagnetic circular waveguide, then characteristics of electromagnetic wave propagation through the piping under test is measured. Propagation characteristics depend on a shape of circular waveguide, therefore the deformation part in piping under test affects the characteristics as the transfer and reflection parameters (S-parameters). In order to perform the measurements of these characteristics, Vector Network Analyzer (VNA) which is usually used for measurement of electronic circuits is applied to fault detection on metallic piping. Measuring ports on the VNA are connected to both sides of piping, then transfer and reflection characteristics of the piping are measured as S-parameters using the VNA. In order to verify this method, we performed experiments on a metallic circular waveguide with a local deformation as piping under test. As a result, propagation characteristics of electromagnetic wave through the piping indicate the existence of deformation in piping under test.
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