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| 講演名 | 2023-12-08 13:30 Multiple Scattering Effect Analysis of Circularly Polarized Radar for Volcanic Lava Observation ○Yuki Yoshimoto（SMM/Chiba Univ.）・Motoyuki Naito（SMM）・Josaphat Tetuko Sri Sumantyo（Chiba Univ./UNS）  SANE2023-80 |
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| 抄録 | （和） | Estimation of eruption size is important for mitigation of eruption hazards, and for this purpose, it is necessary to clarify the dominant factors of eruption style and its transition process from the viewpoint of chemical reaction, but there are still many unknowns, such as the correspondence with thermal history. To solve this problem, we are developing a microwave observation system suitable for in situ observation of volcanic products including lava in a high-temperature closed environment. When observing the volcanic crater, multiple scattering waves from other objects appear due to the influence of rock walls, etc., and these waves interfere with the acquisition of dielectric permittivity information of the object. In this study, we investigate the effect of multiple scattering by a simple cylindrical wall that simulates a crater or fumarole, and the scattering characteristics of circularly polarized waves in a lava layer by electromagnetic field analysis. The results show that in a smooth and uniform dielectric layer simulating a lava layer, the co-polarization component tends to have a scattering distribution with weak backscattering and large side lobes, regardless of the relative permittivity. Analysis of the polarization dependence of the received power of the scattered wave in a system in which a cylindrical wall surface is introduced shows that the cross-polarization received wave can reduce the effect of multiple scattering from the wall surface. This result is presumably due to the circular polarization dependence of the scattering intensity distribution of the smooth dielectric layer. |
| （英） | Estimation of eruption size is important for mitigation of eruption hazards, and for this purpose, it is necessary to clarify the dominant factors of eruption style and its transition process from the viewpoint of chemical reaction, but there are still many unknowns, such as the correspondence with thermal history. To solve this problem, we are developing a microwave observation system suitable for in situ observation of volcanic products including lava in a high-temperature closed environment. When observing the volcanic crater, multiple scattering waves from other objects appear due to the influence of rock walls, etc., and these waves interfere with the acquisition of dielectric permittivity information of the object. In this study, we investigate the effect of multiple scattering by a simple cylindrical wall that simulates a crater or fumarole, and the scattering characteristics of circularly polarized waves in a lava layer by electromagnetic field analysis. The results show that in a smooth and uniform dielectric layer simulating a lava layer, the co-polarization component tends to have a scattering distribution with weak backscattering and large side lobes, regardless of the relative permittivity. Analysis of the polarization dependence of the received power of the scattered wave in a system in which a cylindrical wall surface is introduced shows that the cross-polarization received wave can reduce the effect of multiple scattering from the wall surface. This result is presumably due to the circular polarization dependence of the scattering intensity distribution of the smooth dielectric layer. | |
| キーワード | （和） | Volcanic lava monitoring / Microwave scattering / Circularly polarization / Electromagnetic field analysis / / / / |
| （英） | Volcanic lava monitoring / Microwave scattering / Circularly polarization / Electromagnetic field analysis / / / / | |
| 文献情報 | 信学技報, vol. 123, no. 298, SANE2023-80, pp. 110-115, 2023年12月. | |
| 資料番号 | SANE2023-80 | |
| 発行日 | 2023-11-30 (SANE) | |
| ISSN | Online edition: ISSN 2432-6380 | |
| 著作権に ついて |
技術研究報告に掲載された論文の著作権は電子情報通信学会に帰属します．(許諾番号：10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| PDFダウンロード | SANE2023-80 |
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| 研究会情報 | |
| 研究会 | SANE |
| 開催期間 | 2023-12-07 - 2023-12-09 |
| 開催地（和） | インドネシア ジャワ県ソロ市 |
| 開催地（英） | Surakarta, Indonesia |
| テーマ（和） | ICSANE |
| テーマ（英） | ICSANE |
| 講演論文情報の詳細 | |
| 申込み研究会 | SANE |
| 会議コード | 2023-12-SANE |
| 本文の言語 | 英語 |
| タイトル（和） | |
| サブタイトル（和） | |
| タイトル（英） | Multiple Scattering Effect Analysis of Circularly Polarized Radar for Volcanic Lava Observation |
| サブタイトル（英） | |
| キーワード(1)（和/英） | Volcanic lava monitoring / Volcanic lava monitoring |
| キーワード(2)（和/英） | Microwave scattering / Microwave scattering |
| キーワード(3)（和/英） | Circularly polarization / Circularly polarization |
| キーワード(4)（和/英） | Electromagnetic field analysis / Electromagnetic field analysis |
| キーワード(5)（和/英） | / |
| キーワード(6)（和/英） | / |
| キーワード(7)（和/英） | / |
| キーワード(8)（和/英） | / |
| 第1著者 氏名（和/英/ヨミ） | 吉本 有輝 / Yuki Yoshimoto / ヨシモト ユウキ |
| 第1著者 所属（和/英） | 住友金属鉱山株式会社/千葉大学 (略称： 住友金属鉱山/千葉大) Sumitomo Metal Mining Co., Ltd./Chiba University (略称： SMM/Chiba Univ.) |
| 第2著者 氏名（和/英/ヨミ） | 内藤 大志 / Motoyuki Naito / ナイトウ モトユキ |
| 第2著者 所属（和/英） | 住友金属鉱山株式会社 (略称： 住友金属鉱山) Sumitomo Metal Mining Co., Ltd. (略称： SMM) |
| 第3著者 氏名（和/英/ヨミ） | ヨサファット テトォコ スリ スマンティヨ / Josaphat Tetuko Sri Sumantyo / ヨサファット テトォコ スリ スマンティヨ |
| 第3著者 所属（和/英） | 千葉大学/セベラスマレット大学 (略称： 千葉大/セベラスマレット大) Chiba University/Sebelas Maret University (略称： Chiba Univ./UNS) |
| 講演者 | 第1著者 |
| 発表日時 | 2023-12-08 13:30:00 |
| 発表時間 | 20分 |
| 申込先研究会 | SANE |
| 資料番号 | SANE2023-80 |
| 巻番号（vol） | vol.123 |
| 号番号（no） | no.298 |
| ページ範囲 | pp.110-115 |
| ページ数 | 6 |
| 発行日 | 2023-11-30 (SANE) |
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