JP2013536940A - 固形物及びスラリーの含水量を測定する低磁場nmr装置 - Google Patents
固形物及びスラリーの含水量を測定する低磁場nmr装置 Download PDFInfo
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Abstract
Description
少なくとも0.5dm3の体積を有するサンプルを収容することが可能なサンプル受容空間と、
サンプル受容空間全体に10−40mTの磁場強度で主磁場を生成する抵抗性電磁石と、
サンプル受容空間内に配置されたサンプルに、主磁場によって定まるラーモア周波数で、測定可能な歳差運動する横断磁化を励起するRFコイルと、
好ましくは励起に使用されるのと同じRFコイルを用いて、励起されたサンプルによって生成されるRF信号を測定する手段と、
該RF信号に基づいてサンプルの含水量を決定する計算ユニットと、
を有する。
少なくとも0.5dm3の体積を有するサンプル全体に抵抗的に主磁場を生成し、
サンプルを主磁場に晒してサンプルに正味の磁化を生成し、
400−2000kHzの動作周波数でサンプルに測定可能なRF磁化を励起し、
励起されたサンプルによって生成されるRF信号を測定し、且つ
該RF信号に基づいてサンプルの含水量を決定する
ことを有する。
低い電力消費、
低い磁石温度、
小さい磁石質量、
磁場の温度依存性がない、あるいは低いこと、
シムコイルなしで均一な磁場を生成するために電磁石を使用することができること、
安全なレベルの寄生磁場、
より緩い、磁場に対する相対的均一性要求
より低コストの増幅器、AD変換器、電源など
である。
Claims (15)
- 固形物及びスラリーなどのサンプルの含水量を測定する核磁気共鳴(NMR)装置であって、
主磁場を生成する手段と、
前記主磁場内のサンプル受容空間と、
前記サンプル受容空間内に配置されたサンプルに、前記主磁場によって定められる動作周波数で、測定可能なRF磁化を励起する手段と、
励起されたサンプルによって生成されるRF信号を測定する手段と、
前記RF信号に基づいて前記サンプルの相対的な含水量を決定する手段と、
を有し、
前記サンプル受容空間は、0.5dm3以上の体積を有するサンプルを収容することが可能であり、且つ
前記主磁場を生成する手段は、400−2000kHzの動作周波数に対応する主磁場を生成するように適応された抵抗性電磁石を有する、
ことを特徴とする装置。 - 前記電磁石はパッシブ冷却される、ことを特徴とする請求項1に記載の装置。
- 好ましくは強制空気循環により、前記電磁石はアクティブ冷却する手段、を更に有することを特徴とする請求項1に記載の装置。
- 当該装置の前記動作周波数は400−950kHzである、ことを特徴とする請求項1乃至3の何れかに記載の装置。
- 当該装置の前記動作周波数は950−2000kHzである、ことを特徴とする請求項1乃至3の何れかに記載の装置。
- 前記サンプルが前記サンプル受容空間内にある間に前記サンプルの質量を測定する手段を更に有し、前記サンプルの含水量を決定する手段は、前記サンプルの前記相対的な含水量を決定する際に前記サンプルの質量を使用するように適応される、ことを特徴とする請求項1乃至5の何れかに記載の装置。
- 前記RF信号を測定する手段は、前記励起後の所定のデッドタイムの後に前記RF信号の測定を開始するように適応され、
前記サンプルの含水量を決定する手段は、測定された前記RF信号に基づいて、前記RF信号の値を励起パルスの時点まで外挿するように適応され、且つ前記サンプルの含水量を決定する際に、外挿された信号値を使用するように適応される、
ことを特徴とする請求項1乃至6の何れかに記載の装置。 - 前記サンプル受容空間の容積は0.5−5dm3である、ことを特徴とする請求項1乃至7の何れかに記載の装置。
- サンプルの含水量を測定するNMRベースの方法であって、
主磁場を生成し、
前記サンプルを前記主磁場に晒して前記サンプルに正味の磁化を生成し、
前記主磁場によって定められる動作周波数で前記サンプルに測定可能なRF磁化を励起し、
励起されたサンプルによって生成されるRF信号を測定し、且つ
前記RF信号に基づいて前記サンプルの含水量を決定する
ことを有し、
0.5dm3以上の体積を有するサンプルを使用し、且つ
400−2000kHzの動作周波数に対応する主磁場を生成するように適応された抵抗性電磁石を用いて前記主磁場を生成する、
ことを特徴とする方法。 - 前記サンプルはバイオマスサンプルである、ことを特徴とする請求項9に記載の方法。
- 前記サンプルは固形又はスラリー形態にある、ことを特徴とする請求項9に記載の方法。
- パッシブ冷却される電磁石と400−950kHzの動作周波数とを用いる、ことを特徴とする請求項9乃至11の何れかに記載の方法。
- アクティブ冷却される電磁石と950−2000kHzの動作周波数とを用いる、ことを特徴とする請求項9乃至11の何れかに記載の方法。
- 前記サンプルがサンプル受容空間内にある間に前記サンプルの質量を測定し、且つ前記サンプルの質量に基づいて前記サンプルの含水量を決定する、ことを特徴とする請求項9乃至13の何れかに記載の方法。
- 前記励起後の所定のデッドタイムの後にのみ前記RF信号を測定し、
測定された前記RF信号に基づいて、励起パルスの時点でのRF信号値を推定し、且つ
前記サンプルの含水量を決定する際に、推定された前記RF信号値を使用する、
ことを特徴とする請求項9乃至14の何れかに記載の方法。
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FI20105917 | 2010-08-31 | ||
FI20105917A FI128224B (fi) | 2010-08-31 | 2010-08-31 | Matalakenttäinen ydinmagneettiresonanssilaite kiintoaineiden ja lietteiden vesipitoisuuden mittaamiseksi |
PCT/FI2011/050753 WO2012028785A1 (en) | 2010-08-31 | 2011-08-30 | A low-field nmr device for measuring the water content of solids and slurries |
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JP2013536940A true JP2013536940A (ja) | 2013-09-26 |
JP5771692B2 JP5771692B2 (ja) | 2015-09-02 |
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EP (1) | EP2612135A4 (ja) |
JP (1) | JP5771692B2 (ja) |
CN (1) | CN103250049B (ja) |
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CA (1) | CA2809623C (ja) |
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EP2612135A1 (en) | 2013-07-10 |
RU2013114383A (ru) | 2014-10-10 |
US20130154644A1 (en) | 2013-06-20 |
CA2809623A1 (en) | 2012-03-08 |
FI128224B (fi) | 2020-01-15 |
JP5771692B2 (ja) | 2015-09-02 |
CN103250049B (zh) | 2016-12-21 |
CA2809623C (en) | 2017-12-05 |
RU2573710C2 (ru) | 2016-01-27 |
FI20105917L (fi) | 2012-03-01 |
BR112013004861A2 (pt) | 2016-06-07 |
US9383420B2 (en) | 2016-07-05 |
WO2012028785A1 (en) | 2012-03-08 |
FI20105917A (fi) | 2012-03-01 |
EP2612135A4 (en) | 2014-07-02 |
CN103250049A (zh) | 2013-08-14 |
FI20105917A0 (fi) | 2010-08-31 |
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