A procedure for stable electrical measurements on a rock sample against high contact resistance as a prerequisite for electrical tomography

• 資料種別: 記事
• タイトル: A procedure for stable electrical measurements on a rock sample against high contact resistance as a prerequisite for electrical tomography
• 著者・編者: Takeshi Suzuki; Ryokei Yoshimura; Ken’ichi Yamazaki
• 出版事項: 日本 : Springer Nature
• 出版年月日等: 2021-06-07
• 出版年（W3CDTF）: 2021-06-07
• タイトル（掲載誌）: EPS : Earth, Planets and Space
• 巻号年月日等（掲載誌）: 73(123)
• 掲載巻: 73(123)
• ISSN（掲載誌）: 1880-5981
• ISSN-L（掲載誌）: 1343-8832
• 本文の言語コード: eng
• DOI: 10.1186/s40623-021-01446-9; https://doi.org/10.1186/s40623-021-01446-9
• 国立国会図書館永続的識別子: info:ndljp/pid/11740881; https://dl.ndl.go.jp/pid/11740881
• コレクション（共通）: 障害者向け資料
• コレクション（障害者向け資料：レベル1）: テキストデータ
• コレクション（個別）: 国立国会図書館デジタルコレクション > 電子書籍・電子雑誌 > その他; https://dl.ndl.go.jp/collections/B00035
• 収集根拠: オンライン資料収集制度
• 受理日（W3CDTF）: 2021-10-05T00:13:24+09:00
• 保存日（W3CDTF）: 2021-10-01
• 記録形式（IMT）: application/pdf
• オンライン閲覧公開範囲: 国立国会図書館内限定公開
• デジタル化資料送信: 図書館・個人送信対象外
• 遠隔複写可否（NDL）: 可
• 掲載誌（URI）: https://earth-planets-space.springeropen.com/articles
• 掲載誌（国立国会図書館永続的識別子）: info:ndljp/pid/11667897; https://dl.ndl.go.jp/pid/11667897
• 連携機関・データベース: 国立国会図書館 : 国立国会図書館デジタルコレクション; https://dl.ndl.go.jp

• 要約等: As a basis for the electrical tomography of laboratory-scale rock samples (~ 10 cm), we developed a procedure for stable, multi-point, electrical measurement on rock samples that is effective even at high contact and sample resistance. Electrodes were strongly attached to the surface of high-resistivity rock using conductive and adhesive epoxy. Sustained current injection for long periods into high-resistance rocks was fulfilled using a constant direct current source with high internal resistance. Accurate voltage measurement across the high-resistance rock was accomplished by differential measurement using two high input resistance voltmeters. Measurements of high resistance also require a stable measurement environment: the temperature and humidity in the laboratory were controlled using an air conditioner, a humidifier, a dehumidifier, and a vinyl tent. Signal noise arising from human activities was eliminated by the remote operation of the measuring equipment and switching terminal. The proposed measurement procedure was evaluated in terms of the stability and accuracy of measured values and its applicability to electrical tomography. To assess measurement stability, we performed multiple measurements of a dry granite sample at various levels of absolute humidity. Our procedure recorded highly reproducible measurements under each humidity condition. The observed changes in measured values with absolute humidity indicate the importance of stabilising the temperature and humidity conditions in the laboratory. Applying our technique to multiple plastic samples with known resistivity confirmed its accuracy. To evaluate its applicability to electrical tomography, we measured the potential distribution on a dry granite surface in response to an injected current using a simple 40-electrode array. The potential distribution measured by our procedure agreed well with that predicted by forward modelling, demonstrating the robustness of our procedure in array measurements, and thus indicating its potential applicability to tomographic measurements for a variety of targets even under severe conditions including the relative dryness of ambient humidity.
• DOI: 10.1186/s40623-021-01446-9; https://doi.org/10.1186/s40623-021-01446-9; 10.21203/rs.3.rs-49036/v2; https://doi.org/10.21203/rs.3.rs-49036/v2; 10.21203/rs.3.rs-49036/v1; https://doi.org/10.21203/rs.3.rs-49036/v1
• オンライン閲覧公開範囲: インターネット公開
• 著作権情報: © The Author(s) 2021.; This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.
• 関連情報（URI）: http://hdl.handle.net/2433/274608; http://id.ndl.go.jp/digimeta/11740881; https://dl.ndl.go.jp/pid/11740881; https://link.springer.com/content/pdf/10.1186/s40623-021-01446-9.pdf; https://link.springer.com/article/10.1186/s40623-021-01446-9/fulltext.html
• 参照: Dependence of resistivity of natural rock samples on humidity; https://cir.nii.ac.jp/crid/1360584339762934016; 多孔質岩石の空隙構造と比抵抗の関係解明に向けたデジタル岩石物理の活用; https://cir.nii.ac.jp/crid/1390018053403111168; Using Digital Rock Physics for Elucidating the Relationship between Pore Microstructure and Resistivity in Porous Rocks; https://cir.nii.ac.jp/crid/1390023870191554688
• 連携機関・データベース: 国立情報学研究所 : CiNii Research; https://cir.nii.ac.jp/
• 提供元機関・データベース: 学術機関リポジトリデータベース; https://irdb.nii.ac.jp; 雑誌記事索引データベース; https://ndlsearch.ndl.go.jp; Crossref; https://www.crossref.org
• 書誌ID（NDLBibID）: 11740881; http://id.ndl.go.jp/bib/11740881