JP5170617B2 - 片側開放型磁気回路 - Google Patents
片側開放型磁気回路 Download PDFInfo
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- JP5170617B2 JP5170617B2 JP2007114796A JP2007114796A JP5170617B2 JP 5170617 B2 JP5170617 B2 JP 5170617B2 JP 2007114796 A JP2007114796 A JP 2007114796A JP 2007114796 A JP2007114796 A JP 2007114796A JP 5170617 B2 JP5170617 B2 JP 5170617B2
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- 238000005481 NMR spectroscopy Methods 0.000 claims description 28
- 230000035945 sensitivity Effects 0.000 claims description 26
- 230000005389 magnetism Effects 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 230000004907 flux Effects 0.000 description 8
- 230000007547 defect Effects 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 230000001066 destructive effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 241000283690 Bos taurus Species 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 235000015278 beef Nutrition 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 235000013372 meat Nutrition 0.000 description 2
- 238000000425 proton nuclear magnetic resonance spectrum Methods 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 241000167854 Bourreria succulenta Species 0.000 description 1
- 241001553014 Myrsine salicina Species 0.000 description 1
- 235000019693 cherries Nutrition 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Geophysics And Detection Of Objects (AREA)
Description
プロトンNMR表面スキャナーは、大きな試料表面(岩盤や農産物)をスキャンして、表面から数cm内部を屋外でしかも非破壊でリアルタイムにNMR分析できることを特徴とする。なお「NMR分析」とは、水素原子を含む物質の緩和や拡散過程を計測することであり、その生データを解析することによって、例えば、水や油の量、水素を含む流体の拡散係数、流体分子の運動特性を評価できる。
また農林水産業における、獣肉及び魚肉の肉質の非侵襲評価、例えば、生牛内部をスキャンして牛肉の霜降り判定をしたり(図2)、マグロのトロの霜降り判定にも使える。
あるいは、石油井戸に装置をおろして、孔壁を核磁気共鳴(NMR)でスキャンして、深度ごとの地層の含油量を推定することにも使える(非特許文献1参照)。
(1)円筒軸方向に磁化された円筒型磁石の内周に沿って、円筒軸に垂直な方向に磁化された磁石を配列したことを特徴とする片側解放型磁気回路。
(2)円筒軸方向に磁化された円筒型磁石の内周に沿って、円筒軸に垂直な方向に磁化された角形磁石を複数個対称に配列したことを特徴とする片側解放型磁気回路。
図4では、円柱磁石を採用して、円筒磁石の内部に置いた。この円柱磁石の作る磁力線の概略を図8に示す。磁石内部の矢印は、磁石の磁化の方向である。NMRセンサーの感度領域(点線で囲った領域)では、磁力線は上下方向にほぼそろった均一な磁力線をかもしだしている。一方、磁化方向を横倒しした図6の角形磁石がつくりだす磁力線の概略を図9に示す。これも、点線で囲った領域では、磁力線は上下方向にほぼそろった均一な磁力線をかもしだしている。したがって、両者は等価であり、円柱磁石を角形磁石で置き換えれば、NMRセンサーの感度領域にほぼ同じ磁場を作ることができ、しかも、角形磁石を図6のように配置すれば、コイルを置くための広いスペースを確保できる(図7)。これが、基本的なアイデアである。
(1)油田のボーリング孔に入れて、孔壁をNMRでスキャンして、深度ごとの地層の含油量を推定する。
(2)生きた肉牛や生マグロの表面スキャンをして、価格を左右する脂肪交雑(霜降りの程度)を推定する。
(3)土木建設業における、水を含むコンクリートの養生過程の監視や地盤・岩盤中の欠陥(水を含む亀裂など)の非破壊点検作業にも使える。
(4)天然記念物や文化財の検査にも使える。例えば樹齢千年の桜の表面をスキャンしてプロトン緩和時間の大小で健康状態を診断する。
Claims (2)
- 円筒型磁石の円筒の円筒軸方向における片側開放側に感度領域を有する、NMR測定に用いるための片側開放型磁気回路であって、
円筒軸方向に磁化された前記円筒型磁石の内周に沿って、円筒軸に垂直な方向に磁化された磁石を配列し、該配列により前記感度領域を作ることを特徴とする片側開放型磁気回路。 - 円筒型磁石の円筒の円筒軸方向における片側開放側に感度領域を有する、NMR測定に用いるための片側開放型磁気回路であって、
円筒軸方向に磁化された前記円筒型磁石の内周に沿って、円筒軸に垂直な方向に磁化された角形磁石を複数個対称に配列し、該配列により前記感度領域を作ることを特徴とする片側開放型磁気回路。
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JP5170617B2 true JP5170617B2 (ja) | 2013-03-27 |
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Families Citing this family (6)
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JP5680110B2 (ja) * | 2010-02-01 | 2015-03-04 | クリア−カット メディカル エル・ティー・ディー | 体外サンプルの断端評価 |
CN105559783B (zh) * | 2016-02-03 | 2019-02-19 | 汪红志 | 一种半开放式核磁共振成像系统及其在乳腺成像上的应用 |
US11686793B2 (en) * | 2017-06-08 | 2023-06-27 | Weinberg Medical Physics Inc | Unilateral magnetic resonance imaging system with aperture for interventions and methodologies for operating same |
EP3809150A4 (en) * | 2018-07-08 | 2022-03-23 | Matrix Cell Research Institute Inc. | MAGNETIC BODY DETECTION DEVICE |
JP7210015B2 (ja) * | 2019-02-27 | 2023-01-23 | 国立研究開発法人産業技術総合研究所 | 片側開放型磁気共鳴装置のための磁気回路 |
CN118190630B (zh) * | 2024-05-14 | 2024-09-10 | 中国科学技术大学 | 单边核磁共振联用的变角多轴形变仪 |
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US4590427A (en) * | 1983-03-28 | 1986-05-20 | The United States Of America As Represented By The United States Department Of Energy | Nuclear magnetic resonance apparatus having semitoroidal rf coil for use in topical NMR and NMR imaging |
JP2545484B2 (ja) * | 1990-05-21 | 1996-10-16 | シュルンベルジェ オーバーシーズ,エス,エイ | 地層のnmr特性の穿孔測定及びその解釈 |
US6489872B1 (en) * | 1999-05-06 | 2002-12-03 | New Mexico Resonance | Unilateral magnet having a remote uniform field region for nuclear magnetic resonance |
JP4003485B2 (ja) * | 2002-03-05 | 2007-11-07 | 日立金属株式会社 | 磁界発生装置およびそれを用いたnmr装置 |
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