NMR probe for material analysis
    1.
    发明授权
    NMR probe for material analysis 有权
    NMR探针进行材料分析

    公开(公告)号:US07095230B2

    公开(公告)日:2006-08-22

    申请号:US10955416

    申请日:2004-09-30

    IPC分类号: G01V3/00

    摘要: In a unilateral NMR probe for the analysis of a material comprising at least one magnet for generating a constant time-invariant polarization field B0 in the material to be analyzed and current conductors forming a radio frequency oscillation circuit for generating a pulsed radio frequency magnetic excitation field B1 which is superimposed on the polarization field N0 in the material, the circuit conductors are so designed as to provide several adjacent excitation fields B0 with alternatingly oppositely oriented magnetic fields, whereby the current conductors generating each one of the excitation fields have a distance from each other which causes a certain penetration depth in the material to be analyzed and echoes received therefrom provide measurement values which are characteristic for the material being analyzed.

    摘要翻译: 在用于分析包括至少一个磁体的材料的单侧核磁探针中,用于在待分析的材料中产生恒定的时间不变极化场B 0 <0>和形成射频振荡电路的电流导体 产生叠加在材料中的偏振场N <0>上的脉冲射频磁激励场B 1,电路导体被设计成提供几个相邻的激励场 B <0>具有交替反向取向的磁场,由此产生每个激励场的电流导体彼此之间具有一定距离,这导致要分析的材料中的一定穿透深度,并且从其接收的回波提供 测量值是被分析材料的特征。

    Reduction of motion artifacts in NMR
    3.
    发明授权
    Reduction of motion artifacts in NMR 有权
    降低NMR中的运动伪影

    公开(公告)号:US07180287B2

    公开(公告)日:2007-02-20

    申请号:US10839478

    申请日:2004-05-05

    IPC分类号: G01V3/00

    CPC分类号: G01V3/32

    摘要: NMR spin echo signals, acquired on a MWD logging tool, are susceptible to errors magnetic flux density has a gradient and the magnet on the logging tool is moving relative to the earth. The errors can be corrected by having the excitation pulse cover a smaller or a larger volume than the refocusing pulses. Correction may also be made by selective saturation, or by echo averaging.

    摘要翻译: 在MWD测井工具上获取的NMR自旋回波信号容易受到误差的影响,磁通密度具有梯度,而测井工具上的磁体相对于地球运动。 可以通过使激发脉冲覆盖比重新聚焦脉冲更小或更大的体积来校正误差。 还可以通过选择性饱和或通过回波平均来进行校正。

    Reduction of motion artifacts in NMR
    4.
    发明申请
    Reduction of motion artifacts in NMR 有权
    降低NMR中的运动伪影

    公开(公告)号:US20050248342A1

    公开(公告)日:2005-11-10

    申请号:US10839478

    申请日:2004-05-05

    IPC分类号: G01V3/32 G01V3/00

    CPC分类号: G01V3/32

    摘要: NMR spin echo signals, acquired on a MWD logging tool, are susceptible to errors magnetic flux density has a gradient and the magnet on the logging tool is moving relative to the earth. The errors can be corrected by having the excitation pulse cover a smaller or a larger volume than the refocusing pulses. Correction may also be made by selective saturation, or by echo averaging.

    摘要翻译: 在MWD测井工具上获取的NMR自旋回波信号容易受到误差的影响,磁通密度具有梯度,而测井工具上的磁体相对于地球运动。 可以通过使激发脉冲覆盖比重新聚焦脉冲更小或更大的体积来校正误差。 还可以通过选择性饱和或通过回波平均来进行校正。