公开(公告)号：US07127934B2

公开(公告)日：2006-10-31

申请号：US10438464

申请日：2003-05-15

申请人： Zivko Djukic ,  Steve Kadlecek ,  John Nouls ,  Ian Nelson ,  Bastiaan Driehuys

发明人： Zivko Djukic ,  Steve Kadlecek ,  John Nouls ,  Ian Nelson ,  Bastiaan Driehuys

IPC分类号： G01N27/00

CPC分类号： G01R33/282 ,  G01R33/3628 ,  G01R33/3671

摘要： A system for determining polarization of a gas comprises a container that contains the polarized gas. An oscillator circuit comprises an NMR coil that is positioned adjacent to the container. A pulse generator circuit is configured to generate an electrical pulse that may be transmitted to the optical cell through the NMR coil to excite the polarized gas responsive to a control processor. A Q-reduction circuit that is independent of the pulse generator circuit is configured to reduce oscillations in the oscillator circuit from the transmitted electrical pulse responsive to the control processor. A receive circuit is responsive to an electrical signal that is induced in the oscillator circuit due to the electromagnetic excitation of the polarized gas. The control processor is configured to determine the polarization of the gas based on the output signal of the receive circuit. A polarimetry circuit for determining polarization of a gas includes an NMR coil that may be configured to excite a polarized gas and be responsive to an electromagnetic signal generated by the excited, polarized gas. The polarimetry circuit has a reproducible polarization measurement variability of less than 2% when the NMR coil is exposed to a temperature in a range of about 0° C. to about 200° C. Moreover, circuit-to-circuit polarization measurement variability may be less than about 3%.

摘要翻译： 用于确定气体的极化的系统包括容纳极化气体的容器。 振荡器电路包括与容器相邻定位的NMR线圈。 脉冲发生器电路被配置为产生可以通过NMR线圈传输到光学单元的电脉冲，以响应于控制处理器激发极化气体。 独立于脉冲发生器电路的Q-还原电路被配置为响应于控制处理器减少振荡器电路中的所发射的电脉冲的振荡。 接收电路响应于由于极化气体的电磁激发而在振荡器电路中感应的电信号。 控制处理器被配置为基于接收电路的输出信号确定气体的极化。 用于确定气体极化的偏振电路包括可以被配置为激发极化气体并响应于被激发的极化气体产生的电磁信号的NMR线圈。 当NMR线圈暴露于约0℃至约200℃范围内的温度时，偏振测量电路具有小于2％的可再现偏振测量可变性。此外，电路到电路偏振测量的可变性可以是 小于约3％。

公开(公告)号：US20060097724A1

公开(公告)日：2006-05-11

申请号：US11280069

申请日：2005-11-16

申请人： Zivko Djukic ,  Steve Kadlecek ,  John Nouls ,  Ian Nelson ,  Bastiaan Driehuys

发明人： Zivko Djukic ,  Steve Kadlecek ,  John Nouls ,  Ian Nelson ,  Bastiaan Driehuys

IPC分类号： G01N24/08

CPC分类号： G01R33/282 ,  G01R33/3628 ,  G01R33/3671

摘要： A system for determining polarization of a gas comprises a container that contains the polarized gas. An oscillator circuit comprises an NMR coil that is positioned adjacent to the container. A pulse generator circuit is configured to generate an electrical pulse that may be transmitted to the optical cell through the NMR coil to excite the polarized gas responsive to a control processor. A Q-reduction circuit that is independent of the pulse generator circuit is configured to reduce oscillations in the oscillator circuit from the transmitted electrical pulse responsive to the control processor. A receive circuit is responsive to an electrical signal that is induced in the oscillator circuit due to the electromagnetic excitation of the polarized gas. The control processor is configured to determine the polarization of the gas based on the output signal of the receive circuit. A polarimetry circuit for determining polarization of a gas includes an NMR coil that may be configured to excite a polarized gas and be responsive to an electromagnetic signal generated by the excited, polarized gas. The polarimetry circuit has a reproducible polarization measurement variability of less than 2% when the NMR coil is exposed to a temperature in a range of about 0° C. to about 200° C. Moreover, circuit-to-circuit polarization measurement variability may be less than about 3%

摘要翻译： 用于确定气体的极化的系统包括容纳极化气体的容器。 振荡器电路包括与容器相邻定位的NMR线圈。 脉冲发生器电路被配置为产生可以通过NMR线圈传输到光学单元的电脉冲，以响应于控制处理器激发极化气体。 独立于脉冲发生器电路的Q-还原电路被配置为响应于控制处理器减少振荡器电路中的所发射的电脉冲的振荡。 接收电路响应于由于极化气体的电磁激发而在振荡器电路中感应的电信号。 控制处理器被配置为基于接收电路的输出信号确定气体的极化。 用于确定气体极化的偏振电路包括可以被配置为激发极化气体并响应于被激发的极化气体产生的电磁信号的NMR线圈。 当NMR线圈暴露于约0℃至约200℃范围内的温度时，偏振测量电路具有小于2％的可再现偏振测量可变性。此外，电路到电路偏振测量的可变性可以是 小于3％

公开(公告)号：US20040021466A1

公开(公告)日：2004-02-05

申请号：US10393089

申请日：2003-03-19

申请人： Superconductor Technologies, Inc.

发明人： Robert B. Hammond ,  Jonathan Z. Sun ,  Douglas J. Scalapino ,  Timothy W. James ,  Lincoln C. Bourne

IPC分类号： G01V003/00

CPC分类号： H01G4/008 ,  G01R33/34007 ,  G01R33/34023 ,  G01R33/34053 ,  G01R33/341 ,  G01R33/3642 ,  G01R33/3671 ,  H01F6/06 ,  H01P1/203 ,  H01P7/08 ,  H01P7/088 ,  H01Q1/364 ,  H03K17/78 ,  H03K17/92 ,  H03K2217/0036

摘要： A method of tuning a high temperature superconductor (HTS) resonator includes the steps of providing a HTS inductor and a HTS capacitor, the HTS capacitor being electrically connected to the HTS inductor. A tuning body is provided adjacent to the HTS inductor and the HTS capacitor. The relative position of the tuning body with respect to the HTS inductor and the HTS capacitor is altered so as to tune the resonator. A tunable resonant circuit is provided that includes a substrate having a planar surface. At least one resonator formed from HTS material is disposed on the substrate, the resonator having one or more turns that when combined, turn through greater than 360null.

摘要翻译： 调谐高温超导体（HTS）谐振器的方法包括提供HTS电感器和HTS电容器的步骤，HTS电容器电连接到HTS电感器。 调谐体靠近HTS电感和HTS电容。 改变调谐体相对于HTS电感器和HTS电容器的相对位置，以调谐谐振器。 提供了包括具有平坦表面的基板的可调谐谐振电路。 由HTS材料形成的至少一个谐振器设置在基板上，谐振器具有一个或多个匝，当组合时，该谐振器转过大于360°。

公开(公告)号：US06573720B1

公开(公告)日：2003-06-03

申请号：US09424558

申请日：2000-04-10

申请人： Nallathamby Devasahayam ,  James B. Mitchell ,  Angelo Russo ,  John Cook ,  Mobae Afeworki ,  Rolf G. Tschudin ,  Sankaran Subramanian ,  Ramachandran Murugesan ,  Frank S. Harrington ,  Murali K. Cherukuri

发明人： Nallathamby Devasahayam ,  James B. Mitchell ,  Angelo Russo ,  John Cook ,  Mobae Afeworki ,  Rolf G. Tschudin ,  Sankaran Subramanian ,  Ramachandran Murugesan ,  Frank S. Harrington ,  Murali K. Cherukuri

IPC分类号： G01V300

CPC分类号： G01R33/3671 ,  G01R33/3415 ,  G01R33/60

摘要： A radiofrequency (RF) coil design, suitable for detecting time domain electron paramagnetic resonance (EPR) responses from spin probes after pulsed excitation using radiofrequency irradiation (60-400 MHz), is configured in an array of numerous surface coils of appropriate diameters connected in a parallel or axial configuration with appropriate spacing between individual surface coils to form a volume type resonator.

摘要翻译： 适用于检测使用射频辐射（60-400MHz）的脉冲激发之后的自旋探针的时域电子顺磁共振（EPR）响应的射频（RF）线圈设计被配置为以适当直径连接的许多表面线圈阵列 平行或轴向配置，在各个表面线圈之间具有适当的间隔，以形成体积型谐振器。

公开(公告)号：US5546000A

公开(公告)日：1996-08-13

申请号：US409641

申请日：1995-03-24

申请人： Werner E. Maas ,  David G. Cory ,  Frank H. Laukien

发明人： Werner E. Maas ,  David G. Cory ,  Frank H. Laukien

IPC分类号： G01R33/36 ,  G01R33/20

CPC分类号： G01R33/3671 ,  G01R33/3628 ,  G01R33/3621

摘要： A method of reducing radiation damping during free induction decay in NMR measurements of samples having a narrow line width uses the active switching of the quality factor value of the coil circuit of an NMR detection probe. After application of an excitation pulse to the sample, data acquisition is accomplished in periodic samples. The Q of the coil circuit is set to a high value while each sample is being taken, but is reduced significantly in between samples by detuning the coil circuit. Minimization of the high-Q state of the coil circuit and maximization of the difference between the high Q value and the low Q value greatly decrease the detrimental effects of radiation damping on free induction decay. The coil circuit Q is modified automatically by the application of a Q switching signal generated by a controller, such as a computer which controls other aspect of the NMR experiment.

摘要翻译： 在具有窄线宽的样品的NMR测量中，在自由感应衰减期间减小辐射阻尼的方法使用NMR检测探针的线圈电路的品质因数值的有效切换。 在向样品施加激发脉冲之后，在周期性样品中完成数据采集。 线圈电路的Q值被设定为高值，而每个样品被取出，但是通过使线圈电路失谐而在样品之间显着降低。 线圈电路的高Q状态的最小化和高Q值与低Q值之差的最大化大大降低了辐射阻尼对自由感应衰减的有害影响。 线圈电路Q通过应用由控制器（诸如控制NMR实验的另一方面的计算机）产生的Q开关信号而自动修改。

公开(公告)号：US5055788A

公开(公告)日：1991-10-08

申请号：US431256

申请日：1989-12-05

申请人： Robert L. Kleinberg ,  Douglas D. Griffin ,  Masafumi Fukuhara ,  Abdurrahman Sezginer

发明人： Robert L. Kleinberg ,  Douglas D. Griffin ,  Masafumi Fukuhara ,  Abdurrahman Sezginer

IPC分类号： G01R33/34 ,  G01R33/38 ,  G01R33/44 ,  G01V3/32

CPC分类号： G01V3/32 ,  G01N24/081 ,  G01R33/341 ,  G01R33/3808 ,  G01R33/3671 ,  G01R33/443 ,  G01R33/448

摘要： Borehole NMR logging apparatus and methods, and methods for the interpretation thereof. A logging tool is provided which produces a strong, static and homogeneous magnetic field B.sub.0 in a Volume of an adjacent formation on one side of the tool to measure nuclear magnetic resonance characteristics thereof. In the preferred embodiment, the tool has an RF antenna mounted on the outside of the metal body of the tool, directing focussed oscillating magnetic fields B.sub.1 at said Volume to polarize or tip the Magnetic moments of hydrogen nuclei of fluids within rock pores. The same antenna can be used to receive signals of proton precession in the Volume of interest immediately after transmission of the RF polarizing field B.sub.1. Extremely rapid damping of the antenna between the transmitting and receiving modes of operation is accomplished by a Q-switch disclosed herein. The invention provides for the direct measurement of NMR decay having transverse relaxation time T.sub.2 behavior, and further provides for the fast repetition of pulsed measurements from within a borehole. An additional magnet array may be mounted offset from the first magnet configuration to prepolarize a formation before it is measured in order to pre-align a larger number of protons than the single magnet configuration could do by itself. Additional features of the invention are disclosed which increase the Signal/Noise ratio of the measured data, and improve the quality and quantity of borehole NMR measurements, per unit of time spent. Disclosed interpretation methods determine fluid flow permeability and longitudinal relaxation time T.sub.1 -type parameters by directly comparing the measured decay signals (such as T.sub.2 or T.sub.2 * type decay) to a representation which responds to both the decay time t.sub.dec and the imposed polarization period prior to such decay, t.sub.poi. The parameters of amplitude and T.sub.1 are determined and combined with certain preferred methods to generate robust values of the formation characteristics such as fluid flow permeability. Other related methods are disclosed.

公开(公告)号：US5055787A

公开(公告)日：1991-10-08

申请号：US431368

申请日：1989-12-05

申请人： Robert L. Kleinberg ,  Douglas D. Griffin ,  Masafumi Fukuhara ,  Abdurrahman Sezginer ,  Weng C. Chew

发明人： Robert L. Kleinberg ,  Douglas D. Griffin ,  Masafumi Fukuhara ,  Abdurrahman Sezginer ,  Weng C. Chew

IPC分类号： G01R33/34 ,  G01R33/38 ,  G01R33/44 ,  G01V3/32

CPC分类号： G01V3/32 ,  G01N24/081 ,  G01R33/341 ,  G01R33/3808 ,  G01R33/3671 ,  G01R33/443 ,  G01R33/448

摘要： Borehole NMR logging apparatus and methods, and methods for the interpretation thereof. A logging tool is provided which produces a strong, static and homogeneous magnetic field B.sub.0 in a Volume of an adjacent formation on one side of the tool to measure nuclear magnetic resonance characteristics thereof. In the preferred embodiment, the tool has an RF antenna mounted on the outside of the metal body of the tool, directing focussed oscillating magnetic fields B.sub.1 at said Volume to polarize or tip the magnetic moments of hydrogen nuclei of fluids within rock pores. The same antenna can be used to receive signals of proton precession in the Volume of interest immediately after transmission of the RF polarizing field B.sub.1. Extremely rapid damping of the antenna between the transmitting and receiving modes of operation is accomplished by a Q-switch disclosed herein. The invention provides for the direct measurement of NMR decay having transverse relaxation time T.sub.2 behavior, and further provides for the fast repetition of pulsed measurements from within a borehole. An additional magnet array may be mounted offset from the first magnet configuration to prepolarize a formation before it is measured in order to pre-align a larger number of protons than the single magnet configuration could do by itself. Additional features of the invention are disclosed which increase the Signal/Noise ratio of the measured data, and improve the quality and quantity of borehole NMR measurements, per unit of time spent. Disclosed interpretation methods determine fluid flow permeability and longitudinal relaxation time T.sub.1 -type parameters by directly comparing the measured decay signals (such as T.sub.2 or T.sub.2 * type decay) to a representation which responds to both the decay time t.sub.dec and the imposed polarization period prior to such decay t.sub.poi. The parameters of amplitude and T.sub.1 are determined and combined with certain preferred methods to generate robust values of formation characteristics such as fluid flow permeability. Other related methods are disclosed.

公开(公告)号：US4933638A

公开(公告)日：1990-06-12

申请号：US368916

申请日：1989-06-19

申请人： Robert L. Kleinberg ,  Douglas D. Griffin ,  Masafumi Fukuhara ,  Abdurranhman Sezginer ,  Weng C. Chew ,  William E. Kenyon ,  Peter I. Day ,  Max Lipsicas

发明人： Robert L. Kleinberg ,  Douglas D. Griffin ,  Masafumi Fukuhara ,  Abdurranhman Sezginer ,  Weng C. Chew ,  William E. Kenyon ,  Peter I. Day ,  Max Lipsicas

IPC分类号： G01R33/34 ,  G01R33/38 ,  G01R33/44 ,  G01V3/18 ,  G01V3/32

CPC分类号： G01R33/341 ,  G01N24/081 ,  G01R33/3671 ,  G01R33/3808 ,  G01V3/32

摘要： Borehole NMR logging apparatus and methods, and methods for the interpretation thereof. A logging tool is provided which produces a strong, static and homogeneous magnetic field B.sub.0 in a Volume of an adjacent formation on one side of the tool to measure nuclear magnetic resonance characteristics thereof. In the preferred embodiment, the tool has an RF antenna mounted on the outside of the metal body of the tool, directing focussed oscillating magnetic fields B.sub.1 at said Volume to polarize or tip the magnetic moments of hydrogen nuclei of fluids within rock pores. The same antenna can be used to receive signals of proton precession in the Volume of interest immediately after transmission of the RF polarizing field B.sub.1. Extremely rapid damping of the antenna between the transmitting and receiving modes of operation is accomplished by a Q-switch disclosed herein. The invention provides for the direct measurement of NMR decay having transverse relaxation time T.sub.2 behavior, and further provides for the fast repetition of pulsed measurements from within a borehole. An additional magnet array may be mounted offset from the first magnet configuration to prepolarize a formation before it is measured in order to pre-align a larger number of protons than the single magnet configuration could do by itself. Additional features of the invention are disclosed which increase the Signal/Noise ratio of the measured data, and improve the quality and quantity of borehole NMR measurements, per unit of time spent. Disclosed interpretation methods determine fluid flow permeability and longitudinal relaxation time T.sub.1 -type parameters by directly comparing the measured decay signals (such as T.sub.2 and T.sub.2 * type decay) to a representation which responds to both the decay time t.sub.dec and the imposed polarization period prior to such decay, t.sub.pol. The parameters of amplitude and T.sub.1 are determined and combined with certain preferred methods to generate robust values of formation characteristics such as fluid flow permeability. Other related methods are disclosed.

公开(公告)号：US4717881A

公开(公告)日：1988-01-05

申请号：US798669

申请日：1985-11-15

申请人： David C. Flugan

发明人： David C. Flugan

IPC分类号： G01R33/34 ,  G01R33/36 ,  G01R33/20

CPC分类号： G01R33/3657 ,  G01R33/34069 ,  G01R33/3628 ,  G01R33/3671

摘要： Radio frequency apparatus for a magnetic resonance system is provided which includes an r.f. coil and DC controlled circuitry for selectively altering the characteristics of the coil. A loading coil is provided which is selectively activated to de-Q the coil during r.f. transmission so as to minimize the loading effects of the subject and their effect on coil impedance. A switched network is provided which selectively destroys the normal resonant condition of the coil when a second r.f. coil is operative to minimize interaction between the two coils.

摘要翻译： 提供了一种用于磁共振系统的射频装置，其包括一个r.f. 线圈和直流控制电路，用于选择性地改变线圈的特性。 提供一个加载线圈，其被选择性地激活以在r.f期间使线圈去Q。 传输，以最小化被摄体的负载效应及其对线圈阻抗的影响。 提供了一种交换网络，其选择性地破坏线圈的正常谐振状态，当第二r.f. 线圈可操作以最小化两个线圈之间的相互作用。