JPH10510631A - 高周波磁場パルス発生器 - Google Patents
高周波磁場パルス発生器Info
- Publication number
- JPH10510631A JPH10510631A JP9514075A JP51407597A JPH10510631A JP H10510631 A JPH10510631 A JP H10510631A JP 9514075 A JP9514075 A JP 9514075A JP 51407597 A JP51407597 A JP 51407597A JP H10510631 A JPH10510631 A JP H10510631A
- Authority
- JP
- Japan
- Prior art keywords
- switches
- transmitter coil
- pulse
- generator according
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000007787 solid Substances 0.000 claims abstract description 16
- 238000011835 investigation Methods 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 42
- 238000013016 damping Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 8
- 239000000523 sample Substances 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 11
- 238000005481 NMR spectroscopy Methods 0.000 description 8
- 238000004146 energy storage Methods 0.000 description 7
- 230000001965 increasing effect Effects 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000000264 spin echo pulse sequence Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
- G01R33/3614—RF power amplifiers
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Amplifiers (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
Description
Claims (1)
- 【特許請求の範囲】 (1) NMR調査に使用するための高周波磁場パルスを生成する高周波磁場パルス 発生器であって、 1)1対の入力端子間に並列に接続され、各々が2つの直列接続されたソリ ッドステートスイッチからなる2つの辺と、 2)上記各対の直列接続されたソリッドステートスイッチの間にそれぞれ限 定され、交流高周波信号に応答して磁場パルスを出力端子に送信するようになっ ている送信器コイルと、 3)上記入力端子の一方、または両方に接続されている電源と、 4)上記各辺内の関連スイッチを使用中の所要無線周波数で交互に動作させ ることによって電源を上記送信器コイルにまたがって交互の極性で接続して交流 高周波信号を上記出力端子に生成させる制御手段と、 を備えていることを特徴とする高周波磁場パルス発生器。 (2) 上記各ソリッドステートスイッチは、電力MOSFETスイッチングトラン ジスタからなる請求項(1)に記載の発生器。 (3) 上記各スイッチは、並列の複数のソリッドステートスイッチからなる請求項 (1)または(2)に記載の発生器。 (4) 上記制御手段は、互いに 180°の相差を有する2 つの制御信号を入力し、上 記各辺内の関連スイッチのゲートを駆動するようになっているゲート駆動回路か らなる先行請求項の何れかに記載の発生器。 (5) 上記送信器コイルは、上記送信器コイルと並列の、または直列のキャパシタ ンスを含む共振回路の一部である先行請求項の何れかに記載の発生器。 (6) 上記キャパシタンスは各々が関連スイッチを有する複数の並列キャパシタか らなり、上記制御手段は上記キャパシタスイッチを制御して上記共振回路の共振 周波数を調査中のサンプルの所望のラーモア周波数に調整するようにようになっ ている請求項(5)に記載の発生器。 (7) 上記電源は、電力蓄積キャパシタを備えている先行請求項の何れかに記載の 発生器。 (8) 能動リングダウン回路を更に備え、上記能動リングダウン回路は、1または それ以上のスイッチを介して上記送信器コイルに接続されている1またはそれ以 上のダンピング抵抗と、磁気パルスの後に上記1またはそれ以上のスイッチを閉 じさせる制御手段とを備え、それによって上記1またはそれ以上のダンピング抵 抗は上記送信器コイルを含む電流ループの一部を形成し、上記送信器コイル内の リングダウンを制御するようにエネルギを消散させるようになっている先行請求 項の何れかに記載の発生器。 (9) 上記共振回路は、上記出力端子間に上記送信器コイルと直列に接続されてい るキャパシタンスを備えている請求項(5) に記載の発生器。 (10)先行請求項の何れかによる発生器を備えていることを特徴とするダウンホー ル井戸ロギングプローブ。 (11)先行請求項の何れかによる発生器を動作させる方法であって、あるパルス中 にソリッドステートスイッチの各対の関連するスイッチを動作させる段階と、上 記パルスの終わりに4つの全てのスイッチを開かせ、それによって送信器コイル 内のリングダウンを制御する段階とを備えていることを特徴とする方法。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9520357.6 | 1995-10-05 | ||
GBGB9520357.6A GB9520357D0 (en) | 1995-10-05 | 1995-10-05 | Magnetic field pulse generatir |
PCT/GB1996/002427 WO1997013159A1 (en) | 1995-10-05 | 1996-10-03 | Rf magnetic field pulse generator |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH10510631A true JPH10510631A (ja) | 1998-10-13 |
JP3937099B2 JP3937099B2 (ja) | 2007-06-27 |
Family
ID=10781828
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP51407597A Expired - Fee Related JP3937099B2 (ja) | 1995-10-05 | 1996-10-03 | 高周波磁場パルス発生器 |
Country Status (6)
Country | Link |
---|---|
US (1) | US6002256A (ja) |
EP (1) | EP0819257B1 (ja) |
JP (1) | JP3937099B2 (ja) |
DE (1) | DE69634978T2 (ja) |
GB (1) | GB9520357D0 (ja) |
WO (1) | WO1997013159A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019029943A (ja) * | 2017-08-02 | 2019-02-21 | 株式会社インターフェイス | 電界通信トランシーバー |
Families Citing this family (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AUPR868201A0 (en) * | 2001-11-05 | 2001-11-29 | Thorlock International Limited | Q-factor switching method and apparatus for detecting nuclear quadrupole and nuclear magnetic resonance signals |
US6822570B2 (en) | 2001-12-20 | 2004-11-23 | Calypso Medical Technologies, Inc. | System for spatially adjustable excitation of leadless miniature marker |
GB0209892D0 (en) * | 2002-04-30 | 2002-06-05 | Oxford Instr Superconductivity | Imaging assembly |
US20040035182A1 (en) * | 2002-05-16 | 2004-02-26 | Steve Kadlecek | Methods and systems for determining polarization of a gas based on electron paramagnetic resonance |
AU2003248529A1 (en) * | 2002-05-17 | 2003-12-02 | Medi-Physics, Inc | Methods, systems, circuits, and computer program products for determining polarization of a gas |
CA2390845C (en) * | 2002-06-18 | 2004-10-26 | Magneto-Inductive Systems Limited | Apparatus and method for continuous variable reactive impedance control |
AUPS319102A0 (en) * | 2002-06-25 | 2002-07-18 | Thorlock International Limited | Low ESR switch for nuclear resonance measurements (#13) |
US6882236B2 (en) * | 2002-11-05 | 2005-04-19 | Magneto-Inductive Systems Limited | Dynamically tuned amplifier for frequency shift keyed signals |
GR1004895B (el) * | 2003-06-30 | 2005-05-23 | �. ������ | Μεθοδος και συσκευη επαγωγης ιοντων και πολυ- ενεργοποιησης ατομων με μαγνητικο πυρηνικο συντονισμο- nmr και ηλεκτρονικο παραμαγνητικο συντονισμο -epr, μεσω ηλεκτρονικης διαταξεως - διακοπτη η διακοπτη πλασματος |
DE10342730A1 (de) * | 2003-09-16 | 2005-04-21 | Rheinmetall Waffe Munition | Hochleistungsgenerator zur Erzeugung eines breitbandigen elektromagnetischen Pulses |
US7420367B2 (en) | 2004-09-10 | 2008-09-02 | Baker Hughes Incorporated | High-frequency induction imager with concentric coils for MWD and wireline applications |
US7057390B1 (en) * | 2004-09-20 | 2006-06-06 | Southeastern Univ. Research Assn. | Linear beam raster magnet driver based on H-bridge technique |
WO2007132374A1 (en) * | 2006-05-09 | 2007-11-22 | Koninklijke Philips Electronics N. V. | A magnetic sensor device for and a method of sensing magnetic particles |
US7573267B1 (en) * | 2008-01-19 | 2009-08-11 | General Electric Company | System and method for active MR tracking |
WO2011156870A1 (en) * | 2010-06-18 | 2011-12-22 | Minelab Electronics Pty Limited | A metal detector with at least one transmit-receive switch |
DE102008050242B4 (de) * | 2008-10-07 | 2016-07-07 | OLYMPUS Winter & lbe GmbH | Hochfrequenz-Chirurgiegerät |
US7948312B2 (en) * | 2009-05-13 | 2011-05-24 | Qualcomm, Incorporated | Multi-bit class-D power amplifier system |
US20110125151A1 (en) * | 2009-11-24 | 2011-05-26 | Strauss Timo | High frequency surgical device |
US8581584B2 (en) * | 2010-05-26 | 2013-11-12 | Florida State University Research Foundation | Membrane proteins, mechanisms of action and uses thereof |
US9632203B2 (en) * | 2010-06-22 | 2017-04-25 | Schlumberger Technology Corporation | Non-resonant logging tools with H-bridge switching |
NZ593946A (en) * | 2011-07-07 | 2014-05-30 | Powerbyproxi Ltd | An inductively coupled power transfer receiver |
WO2013022877A1 (en) * | 2011-08-08 | 2013-02-14 | Strata Proximity Systems, Llc | Proximity detection system with concurrent rf and magnetic fields |
US9119281B2 (en) * | 2012-12-03 | 2015-08-25 | Varian Medical Systems, Inc. | Charged particle accelerator systems including beam dose and energy compensation and methods therefor |
CN104579069B (zh) * | 2015-01-30 | 2020-05-26 | 天津工业大学 | 多功能磁场发生控制电路 |
US10418928B2 (en) | 2015-10-29 | 2019-09-17 | Shanghai Shift Electrics Co., Ltd. | Adjustable circuit for personal electric cleaning care appliance |
WO2017105468A1 (en) * | 2015-12-17 | 2017-06-22 | Halliburton Energy Services, Inc. | Downhole detector with reduced ringing |
FR3075494B1 (fr) * | 2017-12-19 | 2019-11-08 | Continental Automotive France | Procede de suppression au moins partielle des oscillations survenant a la fin d'une decharge en courant pour un pont en h |
NL2029664B1 (en) * | 2021-11-08 | 2023-06-05 | Prodrive Tech Innovation Services B V | Rf pulse amplifier comprising a dc/dc converter |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4628264A (en) * | 1984-03-14 | 1986-12-09 | Advanced Nmr Systems, Inc. | NMR gradient field modulation |
JPH0669312B2 (ja) * | 1985-09-20 | 1994-08-31 | 株式会社日立製作所 | インバ−タ装置 |
GB8530930D0 (en) * | 1985-12-16 | 1986-01-29 | Mansfield P | Inductive circuit arrangements |
DE3829374A1 (de) * | 1988-08-30 | 1990-03-22 | Philips Patentverwaltung | Hochfrequenzerzeuger fuer kernspinuntersuchungsgeraete |
EP0429715B1 (de) * | 1989-12-01 | 1996-07-10 | Siemens Aktiengesellschaft | Verfahren zum Betrieb eines Kernspintomographiegeräts mit einem Resonanzkreis zur Erzeugung von Gradientenfeldern |
JP2928595B2 (ja) * | 1990-06-27 | 1999-08-03 | 株式会社東芝 | 傾斜磁場発生装置 |
US5629624A (en) * | 1990-06-29 | 1997-05-13 | The Regents Of The University Of California | Switched field magnetic resonance imaging |
US5592083A (en) * | 1995-03-08 | 1997-01-07 | Quantum Magnetics, Inc. | System and method for contraband detection using nuclear quadrupole resonance including a sheet coil and RF shielding via waveguide below cutoff |
-
1995
- 1995-10-05 GB GBGB9520357.6A patent/GB9520357D0/en active Pending
-
1996
- 1996-10-03 DE DE69634978T patent/DE69634978T2/de not_active Expired - Fee Related
- 1996-10-03 WO PCT/GB1996/002427 patent/WO1997013159A1/en active IP Right Grant
- 1996-10-03 EP EP96932713A patent/EP0819257B1/en not_active Expired - Lifetime
- 1996-10-03 JP JP51407597A patent/JP3937099B2/ja not_active Expired - Fee Related
- 1996-10-03 US US08/860,234 patent/US6002256A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019029943A (ja) * | 2017-08-02 | 2019-02-21 | 株式会社インターフェイス | 電界通信トランシーバー |
Also Published As
Publication number | Publication date |
---|---|
EP0819257B1 (en) | 2005-07-27 |
JP3937099B2 (ja) | 2007-06-27 |
GB9520357D0 (en) | 1995-12-06 |
WO1997013159A1 (en) | 1997-04-10 |
DE69634978T2 (de) | 2006-04-20 |
US6002256A (en) | 1999-12-14 |
EP0819257A1 (en) | 1998-01-21 |
DE69634978D1 (de) | 2005-09-01 |
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