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35 条记录 (耗时 0.017 秒)

    Liquid helium level sensor for use in a cryogenic environment and method for assembling same
    1.
    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 for winding an embedded b-zero coil
    3.
    发明授权
    Method for winding an embedded b-zero coil 失效
    用于缠绕嵌入式b零线圈的方法

    公开(公告)号：US06892440B2

    公开(公告)日：2005-05-17

    申请号：US09963982

    申请日：2001-09-26

    申请人： Stephen R. Elgin, II ,  Michael R. Eggleston ,  Minfeng Xu

    发明人： Stephen R. Elgin, II ,  Michael R. Eggleston ,  Minfeng Xu

    IPC分类号： G01R33/3815 ,  H01L39/24

    CPC分类号： G01R33/3815 ,  Y10T29/49014

    摘要： A method for winding on embedded b-zero coil maintains the integrity of superconducting main coil and the b-zero wire during coil winding and during normal operation of a superconducting MRI magnet. The b-zero coil is co-wound with an aluminum overwrap while the aluminum overwrap is being wound onto the superconducting MRI coil. The two-wire geometries are selected such that the height or thickness of the aluminum overwrap is greater than or equal to the height or thickness of the b-zero coil wire. The b-zero coil wire sits in a cavity that is created by adjacent turns.

    摘要翻译： 在嵌入式b-零线圈上缠绕的方法在线圈绕组期间和在超导MRI磁体的正常操作期间保持超导主线圈和b-zero线的完整性。 b-zero线圈与铝外包层共同缠绕，同时铝外包装被缠绕在超导MRI线圈上。 选择双线几何形状使得铝外包层的高度或厚度大于或等于b-零线圈线的高度或厚度。 b零线圈线位于由相邻匝产生的空腔中。

    Superconducting magnetic resonance imaging magnet assembly and method with reverse wire channel orientation
    4.
    发明授权
    Superconducting magnetic resonance imaging magnet assembly and method with reverse wire channel orientation 失效
    超导磁共振成像磁体组件及反向导线方向的方法

    公开(公告)号：US06633215B2

    公开(公告)日：2003-10-14

    申请号：US09681568

    申请日：2001-05-01

    申请人： Minfeng Xu ,  Michael Robert Eggleston ,  Stephen R. Elgin, II ,  Jinhua Huang

    发明人： Minfeng Xu ,  Michael Robert Eggleston ,  Stephen R. Elgin, II ,  Jinhua Huang

    IPC分类号： H01F720

    CPC分类号： G01R33/3815 ,  G01R33/421 ,  Y10T29/49014

    摘要： A superconducting magnetic resonance imaging magnet assembly is provided. The assembly includes an axial imaging bore to receive patients and a coil housing surrounding the axial bore. A main magnet coil assembly is disposed within the housing. The main magnet coil assembly includes a plurality of main magnet coils to produce a magnetic field. At least three pairs of superconductive coils are provided. In one aspect, each of the coils in at least one of the pairs comprises a superconductor wire carrying an electric current in a direction opposite to the direction of current carried by the coils of another of the superconductive pairs. The superconductor wire comprises a superconductor core and a stabilizer having a channel. The wire is wound so that the channel has a radially outward facing opening. In another embodiment, low-aspect-ratio coils are used for at least one of the pairs of superconductive coils with the outer diameter coil portion comprising a superconductor core and a stabilizer channel having a radially outward facing opening.

    摘要翻译： 提供超导磁共振成像磁体组件。 组件包括用于接收患者的轴向成像孔和围绕轴向孔的线圈壳体。 主磁体线圈组件设置在壳体内。 主磁体线圈组件包括多个主磁体线圈以产生磁场。 提供至少三对超导线圈。 在一个方面，至少一个对中的每个线圈包括在与另一个超导对的线圈承载的电流方向相反的方向上承载电流的超导体线。 超导线包括超导体芯和具有通道的稳定器。 线缠绕，使得通道具有径向向外的开口。 在另一个实施例中，低纵横比线圈用于至少一对超导线圈，外径线圈部分包括超导体芯和具有径向向外的开口的稳定器通道。

    Method and apparatus for passive shimming of magnets
    5.
    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。

    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。

    Method and apparatus for actively controlling quench protection of a superconducting magnet
    10.
    发明授权
    Method and apparatus for actively controlling quench protection of a superconducting magnet 有权
    主动控制超导磁体淬火保护的方法和装置

    公开(公告)号：US07876100B2

    公开(公告)日：2011-01-25

    申请号：US12567846

    申请日：2009-09-28

    申请人： Xianrui Huang ,  Minfeng Xu

    发明人： Xianrui Huang ,  Minfeng Xu

    IPC分类号： G01V3/00

    CPC分类号： G01R33/3815 ,  G01R33/288 ,  H01F6/02

    摘要： A method and apparatus for actively controlling quench protection of a superconducting magnet includes a magnetic resonance imaging (MRI) system and a computer readable storage medium having stored thereon a computer program comprising instructions which when executed by a computer cause the computer to detect a quench condition of the superconducting magnet. The instructions also cause the computer to actively control a quench protection system of the superconducting magnet in response to the detected quench condition.

    摘要翻译： 用于主动控制超导磁体的淬火保护的方法和装置包括磁共振成像（MRI）系统和其上存储有计算机程序的计算机可读存储介质，所述计算机程序包括当计算机执行时使计算机检测淬火条件的指令 的超导磁体。 指令还使得计算机响应于检测到的淬火条件主动地控制超导磁体的淬火保护系统。