2021 Fiscal Year Final Research Report
High-precision defect detection method for metallic tubes using electromagnetic wave propagation inside the metallic tube
Project/Area Number |
19K04919
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 25020:Safety engineering-related
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Research Institution | Gunma University |
Principal Investigator |
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Project Period (FY) |
2019-04-01 – 2022-03-31
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Keywords | 電磁波伝達関数 / 円形導波管 / 電磁波伝搬位相特性 / 群遅延特性 / 配管き裂 |
Outline of Final Research Achievements |
The original idea in this research theme is to regard metallic tubes as circular waveguides which can propagate the electromagnetic wave inside of it. By radiating the electromagnetic wave inside the metallic tube, it can propagate the electromagnetic wave through the metallic tube with integrity. Main research results are follows: 1. the measurement method using the electromagnetic wave transmission characteristics propagating in the pipe is effective for detecting clogs, 2. electromagnetic wave propagation characteristic has well integrity, especially group delay characteristic is very valid for measurement for metallic tubes trouble, 3. this measurement method is possible to detect cracks occurred on the pipe wall. From the above results, a new measurement field using electromagnetic waves for detection of metal tube defects has been established.
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Free Research Field |
電磁波工学
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Academic Significance and Societal Importance of the Research Achievements |
大規模プラントでは多くの金属配管設備が利用されているが、それらを効率的に保守管理するための計測技術は、安全運用に欠かせない重要な技術である。従来の配管検査法はいづれも局所的な検査であり、配管全体を効率よく検査する計測方法が確立されておらず、安全管理上の問題点であった。 本研究成果では、金属配管を電磁波円形導波管に見立てて、その内部を伝搬する広帯域電磁波を利用することで、配管の両端で電磁波計測するだけで配管全体を容易に検査可能とする新たな計測方法であり、安全管理上有用な新たな計測分野の確立を可能とするものである。
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