2023 Fiscal Year Final Research Report
Challenge to extract features by imaging information for arbitrary underground structure with cavities and metallic scatterer
| Project/Area Number |
21K04239
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 22020:Structure engineering and earthquake engineering-related
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| Research Institution | Nihon University |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 時間応答解析 / 高速逆ラプラス変換法 / 反射信号の差分波形 / イメージング解析 / 物理現象の解明 / 非破壊検査 / 波動信号の情報処理 |
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| Outline of Final Research Achievements |
In this study, we have been developed both formulation and numerically technique to analyze for scattering problem of transient electromagnetic fields. The purpose of this study is to obtain the extract features for cavities and metallic scatterer buried in underground structure by using our developed method such as imaging information analysis method.
The main research results are as following items. (1) We developed a numerical analysis method for cavities buried in subsurface structure. (2) It is possible to estimate cavity size from amplitude difference for differential waveform of electric and magnetic fields. (3) We developed a numerical technique for many metallic objects buried in underground structure. (4) We established features detection method by using imaging analysis for many metallic objects buried in underground structure.
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| Free Research Field |
光・波動情報工学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では，任意な空洞や金属物体がある地中構造によってモデル化を行い，過渡電磁界の散乱問題における定式化ならびに高精度に解析できる数値解析手法を開発した．本研究で開発した数値解析法を用いて得られた成果により，地中埋設物の空洞や金属物体の特徴検出において電磁界時間応答による差分波形の振幅差から空洞サイズを識別できることを示した．またイメージング解析から地中構造内の金属物体からの散乱回折現象を可視化することで特徴検出を行える知見を得られた点に学術的意義がある．これは地中レーダ探査の分解能向上に期待できる成果であり社会インフラ整備の観点から社会的意義がある．
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