利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

34 条记录 (耗时 0.03 秒)

    APPARATUS AND METHOD FOR PROTECTING A MAGNETIC RESONANCE IMAGING MAGNET DURING QUENCH
    4.
    发明申请
    APPARATUS AND METHOD FOR PROTECTING A MAGNETIC RESONANCE IMAGING MAGNET DURING QUENCH 有权
    在QU CH。。。。。。。。。。。。。。。。。。。。。。。

    公开(公告)号：US20120182012A1

    公开(公告)日：2012-07-19

    申请号：US13009407

    申请日：2011-01-19

    申请人： Yuri Lvovsky ,  Weijun Shen ,  Jian-She Wang

    发明人： Yuri Lvovsky ,  Weijun Shen ,  Jian-She Wang

    IPC分类号： G01R33/44 ,  H02H9/00 ,  H01F6/00

    CPC分类号： G01R33/3815 ,  H01F6/02 ,  H02H7/001 ,  Y02E40/68

    摘要： A superconducting magnet assembly comprising a plurality of superconducting magnet coil portions forming a coil series circuit to provide a magnetic field, a power supply to supply power to the plurality of superconducting magnet coil portions during a magnet ramp mode of operation, and a ramp switch coupled to the superconducting magnet coil portions, wherein the ramp switch is configured to be open during a magnet ramp mode and closed during a persistent mode. A dump resistor is disposed externally to the vessel and is connectable by the ramp switch to the superconducting magnet coil portions. Further, a controller is coupled to at least one superconducting magnet coil portion and the ramp switch and is configured to detect a quench onset condition in the at least one superconducting magnet coil portion and to open the ramp switch upon detection of the quench onset condition in order to dump magnet energy.

    摘要翻译： 一种超导磁体组件，包括形成线圈串联电路以提供磁场的多个超导磁体线圈部分，在磁体斜坡操作模式期间向多个超导磁体线圈部分供电的电源，以及耦合到 到所述超导磁体线圈部分，其中所述斜坡开关被配置为在磁体斜坡模式期间打开并在持久模式期间闭合。 放电电阻器设置在容器的外部，并且可由斜坡开关连接到超导磁体线圈部分。 此外，控制器耦合到至少一个超导磁体线圈部分和斜坡开关，并且被配置为检测至少一个超导磁体线圈部分中的骤冷起始状态，并且在检测到淬火开始条件时打开斜坡开关 为了倾倒磁铁能量。

    Apparatus and method for protecting a magnetic resonance imaging magnet during quench
    5.
    发明授权
    Apparatus and method for protecting a magnetic resonance imaging magnet during quench 有权
    在淬火期间保护磁共振成像磁体的装置和方法

    公开(公告)号：US08542015B2

    公开(公告)日：2013-09-24

    申请号：US13009407

    申请日：2011-01-19

    申请人： Yuri Lvovsky ,  Weijun Shen ,  Jian-She Wang

    发明人： Yuri Lvovsky ,  Weijun Shen ,  Jian-She Wang

    IPC分类号： G01V3/00

    CPC分类号： G01R33/3815 ,  H01F6/02 ,  H02H7/001 ,  Y02E40/68

    摘要： A superconducting magnet assembly comprising a plurality of superconducting magnet coil portions forming a coil series circuit to provide a magnetic field, a power supply to supply power to the plurality of superconducting magnet coil portions during a magnet ramp mode of operation, and a ramp switch coupled to the superconducting magnet coil portions, wherein the ramp switch is configured to be open during a magnet ramp mode and closed during a persistent mode. A dump resistor is disposed externally to the vessel and is connectable by the ramp switch to the superconducting magnet coil portions. Further, a controller is coupled to at least one superconducting magnet coil portion and the ramp switch and is configured to detect a quench onset condition in the at least one superconducting magnet coil portion and to open the ramp switch upon detection of the quench onset condition in order to dump magnet energy.

    摘要翻译： 一种超导磁体组件，包括形成线圈串联电路以提供磁场的多个超导磁体线圈部分，在磁体斜坡操作模式期间向多个超导磁体线圈部分供电的电源，以及耦合到 到所述超导磁体线圈部分，其中所述斜坡开关被配置为在磁体斜坡模式期间打开并在持久模式期间闭合。 放电电阻器设置在容器的外部，并且可由斜坡开关连接到超导磁体线圈部分。 此外，控制器耦合到至少一个超导磁体线圈部分和斜坡开关，并且被配置为检测至少一个超导磁体线圈部分中的骤冷起始状态，并且在检测到淬火开始条件时打开斜坡开关 为了倾倒磁铁能量。

    Method and apparatus for passive shimming of magnets
    6.
    发明授权
    Method and apparatus for passive shimming of magnets 失效
    用于磁体被动调光的方法和装置

    公开(公告)号：US07196520B2

    公开(公告)日：2007-03-27

    申请号：US10904094

    申请日：2004-10-22

    申请人： Weijun Shen ,  Minfeng Xu ,  Bu-Xin Xu

    发明人： Weijun Shen ,  Minfeng Xu ,  Bu-Xin Xu

    IPC分类号： G01V3/00

    CPC分类号： G01R33/3873

    摘要： An apparatus and method for shimming a magnetic field of a magnet in a volume of interest includes a nonmagnetic holder configured with an array of fluid containing pockets; and a solidified ferromagnetic fluid in each pocket of the array of fluid containing pockets, wherein the solidified ferromagnetic fluid is fabricated from a ferromagnetic fluid, a diluting liquid, a hardener, and an accelerator agent. The ferromagnetic fluid includes a carrier liquid, ferromagnetic particles, and a surfactant.

    摘要翻译： 用于对感兴趣的体积中的磁体的磁场进​​行匀场的装置和方法包括：非磁性保持器，其配置有包含口袋的流体阵列; 以及在包含凹穴的流体阵列的每个凹槽中的固化铁磁流体，其中固化的铁磁流体由铁磁流体，稀释液体，固化剂和促进剂制成。 铁磁流体包括载液，铁磁颗粒和表面活性剂。

    Liquid helium level sensor for use in a cryogenic environment and method for assembling same
    7.
    发明授权
    Liquid helium level sensor for use in a cryogenic environment and method for assembling same 有权
    用于低温环境的液氦液位传感器及其组装方法

    公开(公告)号：US06925873B2

    公开(公告)日：2005-08-09

    申请号：US10439395

    申请日：2003-05-16

    申请人： Minfeng Xu ,  Weijun Shen ,  Stephen R. Elgin

    发明人： Minfeng Xu ,  Weijun Shen ,  Stephen R. Elgin

    IPC分类号： G01F23/00 ,  G01F23/22 ,  G01F23/24

    CPC分类号： G01F23/246 ,  G01F23/22

    摘要： The present invention provides a method and apparatus for measuring the level of a liquid cryogen. The invention provides for use of a current source (52), a length, or multiple lengths, of superconducting filament (40) situated within a cryostat (1) containing a cryogenic fluid (2) and a voltmeter (51) for measuring the voltage drop across the filament (40). The invention further provides a method for using said apparatus.

    摘要翻译： 本发明提供了一种用于测量液体冷冻剂水平的方法和装置。 本发明提供使用位于包含低温流体（2）和电压计（51）的低温恒温器（1）内的超导细丝（40）的电流源（52），长度或多个长度，用于测量电压 穿过灯丝（40）。 本发明还提供了一种使用所述装置的方法。

    METHOD AND APPARATUS FOR PASSIVE SHIMMING OF MAGNETS
    8.
    发明申请
    METHOD AND APPARATUS FOR PASSIVE SHIMMING OF MAGNETS 失效
    磁体被动遮蔽的方法和装置

    公开(公告)号：US20060208732A1

    公开(公告)日：2006-09-21

    申请号：US10904094

    申请日：2004-10-22

    申请人： Weijun Shen ,  Minfeng Xu ,  Bu-Xin Xu

    发明人： Weijun Shen ,  Minfeng Xu ,  Bu-Xin Xu

    IPC分类号： G01V3/00 ,  H01F7/02

    CPC分类号： G01R33/3873

    摘要： An apparatus and method for shimming a magnetic field of a magnet in a volume of interest includes a nonmagnetic holder configured with an array of fluid containing pockets; and a solidified ferromagnetic fluid in each pocket of the array of fluid containing pockets, wherein the solidified ferromagnetic fluid is fabricated from a ferromagnetic fluid, a diluting liquid, a hardener, and an accelerator agent. The ferromagnetic fluid includes a carrier liquid, ferromagnetic particles, and a surfactant.

    摘要翻译： 用于对感兴趣的体积中的磁体的磁场进​​行匀场的装置和方法包括：非磁性保持器，其配置有包含口袋的流体阵列; 以及在包含凹穴的流体阵列的每个凹槽中的固化铁磁流体，其中固化的铁磁流体由铁磁流体，稀释液体，固化剂和促进剂制成。 铁磁流体包括载液，铁磁颗粒和表面活性剂。

    Superconducting magnet having cold iron shimming capability
    9.
    发明授权
    Superconducting magnet having cold iron shimming capability 有权
    具有冷铁垫片能力的超导磁体

    公开(公告)号：US08604793B2

    公开(公告)日：2013-12-10

    申请号：US12909533

    申请日：2010-10-21

    申请人： Weijun Shen ,  Yuri Lvovsky ,  Zhenyu Zhang

    发明人： Weijun Shen ,  Yuri Lvovsky ,  Zhenyu Zhang

    IPC分类号： G01R33/3873 ,  G01R33/3815

    CPC分类号： G01R33/3873 ,  G01R33/3815

    摘要： A method of shimming a superconducting magnet assembly that includes a cryostat and a superconducting magnet configured to be installed in the cryostat. The method includes determining a plurality of field inhomogeneity characteristics of the superconducting magnet while the superconducting magnet is at room temperature and prior to the superconducting magnet being sealed in the cryostat, and installing an initial set of passive shims inside the cryostat while the superconducting magnet is at room temperature, the initial set of passive shims reducing the determined field inhomogeneity characteristics when the superconducting magnet is operating at a normal operational temperature.

    摘要翻译： 一种对超导磁体组件进行匀场的方法，其包括构造成安装在低温恒温器中的低温恒温器和超导磁体。 该方法包括确定超导磁体的多个场不均匀性特性，同时超导磁体在室温下，超导磁体被密封在低温恒温器之前，以及在低温恒温器内安装初始的被动垫片，而超导磁体是 在室温下，当超导磁体在正常工作温度下运行时，初始的被动垫片减小了确定的场不均匀性特征。

    Thermal controlling method, magnetic field generator and MRI apparatus
    10.
    发明授权
    Thermal controlling method, magnetic field generator and MRI apparatus 失效
    热控制方法，磁场发生器和MRI装置

    公开(公告)号：US07639013B2

    公开(公告)日：2009-12-29

    申请号：US11777611

    申请日：2007-07-13

    申请人： Fengshun Tan ,  Weijun Shen ,  Yihe Hua ,  Liang Liu

    发明人： Fengshun Tan ,  Weijun Shen ,  Yihe Hua ,  Liang Liu

    IPC分类号： G01V3/00

    CPC分类号： G01R33/383 ,  G01R33/3804 ,  G01R33/3806 ,  H01F7/0278

    摘要： With a view toward implementing a thermal controlling method for making reversible a temperature characteristic of a magnetic field generator using permanent magnets small in Hcj, a magnetic field generator whose temperature characteristic is reversible, using permanent magnets small in Hcj, and an MRI apparatus provided with such a magnetic field generator, there is provided a method for controlling the temperature of a magnetic field generator having a pair of disc-shaped permanent magnets whose magnetic poles opposite in polarity to each other are opposed to each other with spacing defined therebetween, and a yoke that forms return passes for magnetic fluxes of the permanent magnets, comprising the steps of raising the temperature from room temperature to a temperature higher than the room temperature, maintaining the temperature higher than the room temperature, and lowering the temperature from the temperature higher than the room temperature to the room temperature, whereby the temperature characteristics of the permanent magnets are made reversible.

    摘要翻译： 为了实现使用Hcj小的永磁体的磁场发生器的可逆温度特性的可变温度特性的方法，使用温度特性可逆的磁场发生器，使用Hcj小的永磁体和具有 这样的磁场发生器提供了一种用于控制具有一对圆盘形永磁体的磁场发生器的温度的方法，所述一对圆盘形永久磁铁的极性彼此相对的磁极彼此相对并具有间隔，并且 形成永磁体的磁通量的返回通道的磁轭，包括将温度从室温升高到高于室温的温度，保持温度高于室温的步骤，并将温度从高于 室温到室温，由此t 使永磁体的温度特性可逆。