NQR methods and apparatus
    1.
    发明授权
    NQR methods and apparatus 失效
    NQR方法和仪器

    公开(公告)号:US5457385A

    公开(公告)日:1995-10-10

    申请号:US122545

    申请日:1993-09-30

    摘要: A method for detecting the presence within a larger article of a specific substance containing quadrupolar atomic nuclei includes performing tests of parts of the article by placing the article adjacent to an array of coils (10), energizing with an rf source (20) the coils (10) in periods within a cyclic sequence to irradiate parts of the article with rf pulses of one or more frequencies at or close to a resonant frequency of quadrupolar atomic nuclei within the substance to be detected, connecting the coils (10) in other periods within the cyclic sequence to a phase-sensitive detecting and measuring circuit (15, 24-26) to measure response signals due to nuclear quadrupole resonances, and summing the response signals detected at corresponding instants over a number of cyclic sequences. Apparatus for detecting the presence of a specific substance analogous to the above method is also disclosed.

    摘要翻译: PCT No.PCT / GB92 / 00577 Sec。 371日期:1993年9月30日 102(e)日期1993年9月30日PCT提交1992年4月1日PCT公布。 WO92 / 17793 PCT出版物 用于检测在含有四极原子核的特定物质的较大制品内的存在的方法包括通过将物品放置在与线圈阵列(10)相邻的位置处,对物品的部分进行测试, rf源(20)在循环序列内的周期内,以在待检测物质内的四极原子核的共振频率处或接近一个或多个频率的rf脉冲照射物品的部分, 在循环序列中的其他周期内的线圈(10)到相敏检测和测量电路(15,24-26),以测量由于四核四极共振引起的响应信号,并且将在相应时刻检测到的响应信号相加多个 循环序列。 还公开了用于检测与上述方法类似的特定物质的存在的装置。

    Method of and apparatus for NQR testing selected nuclei with reduced
dependence on a given environmental parameter
    2.
    发明授权
    Method of and apparatus for NQR testing selected nuclei with reduced dependence on a given environmental parameter 失效
    NQR测试选择核的方法和装置,减少对给定环境参数的依赖

    公开(公告)号:US5583437A

    公开(公告)日:1996-12-10

    申请号:US122504

    申请日:1993-09-30

    摘要: A method of NQR testing a sample having at least one NQR property which varies with a given environmental parameter comprises applying excitation to the sample to excite NQR resonance and detecting the NQR response signal. The excitation is such as to excite an NQR response signal which is detectable during the detection step over a predetermined range of the environmental parameter. The invention also relates to a method of, and apparatus for, NQR testing for the presence of selected nuclei (particularly nuclei of integral spin quantum number, such as .sup.14 N) in a sample. It also relates to a method of determining the spatial distribution of temperature within a sample.

    摘要翻译: PCT No.PCT / GB92 / 00580 Sec。 371日期:1993年9月30日 102(e)日期1993年9月30日PCT提交1992年4月1日PCT公布。 第WO92 / 17794号公报 日期:1992年10月15日,NQR测试具有至少一个随着给定环境参数变化的NQR性质的样品的NQR测试方法包括向样品施加激发以激发NQR共振并检测NQR响应信号。 该激发使得能够激发在检测步骤中在环境参数的预定范围内可检测的NQR响应信号。 本发明还涉及用于在样品中存在所选择的核(特别是整数自旋量子数的核,例如14N)的NQR测试的方法和装置。 它还涉及确定样品中的温度的空间分布的方法。

    Methods and apparatus for detecting substances containing nuclei of a
first and second kind
    3.
    发明授权
    Methods and apparatus for detecting substances containing nuclei of a first and second kind 失效
    用于检测含有第一种和第二种核的物质的方法和装置

    公开(公告)号:US5500591A

    公开(公告)日:1996-03-19

    申请号:US140082

    申请日:1994-03-21

    CPC分类号: G01R33/62 G01R33/44

    摘要: A method for detecting the presence of a substance in a heterogeneous sample or article (i.e., a contraband substance) in a magnetic field includes establishing a level-crossing condition (B.sub.LC) for the substance to be detected for a set time (t.sub.b), and subsequently measuring nuclear magnetic resonance (NMR) signals to detect some consequence of the level-crossing condition. A saturating signal is applied at the begining of each cyclic test. Apparatus for detecting the presence of predetermined substances is also disclosed.

    摘要翻译: PCT No.PCT / GB92 / 00798 Sec。 371日期1994年3月21日 102(e)1994年3月21日PCT提交1992年4月30日PCT公布。 第WO92 / 19979号公报 日期:1992年11月12日。一种在磁场中检测异质样品或制品(即违禁物质)中物质的存在的方法包括建立待检测物质的水平交叉条件(BLC) 设定时间(tb),随后测量核磁共振(NMR)信号以检测电平交叉条件的一些后果。 在每个循环测试的开始时应用饱和信号。 还公开了用于检测预定物质的存在的装置。

    Method of nuclear quadrupole resonance testing of integral spin quantum
number systems
    4.
    发明授权
    Method of nuclear quadrupole resonance testing of integral spin quantum number systems 失效
    积分自旋量子数系统的核四极共振测试方法

    公开(公告)号:US5491414A

    公开(公告)日:1996-02-13

    申请号:US244487

    申请日:1994-08-26

    IPC分类号: G01N24/00 G01R33/44 G01R33/20

    CPC分类号: G01R33/441

    摘要: A method of Nuclear Quadrupole Resonance testing includes the steps of applying to a sample in which selected nuclei have an integral spin quantum number a series of at least three pulses of electromagnetic waves at a single radiofrequency to excite quadrupole resonance of the selected nuclei, and detecting responses at a plurality of times when echo response signals are expected to occur.

    摘要翻译: PCT No.PCT / GB92 / 02254 Sec。 371日期1992年12月4日第 102(e)日期1992年12月4日PCT提交1992年12月4日PCT公布。 公开号WO93 / 11441 核四极共振测试的方法包括以下步骤:将选择的核具有整体自旋量子数的样品应用于单射频的至少三个脉冲的电磁波以激发四极共振 ,并且当预期出现回波响应信号时多次检测响应。

    System and method for contraband detection using nuclear quadrupole resonance
    5.
    发明授权
    System and method for contraband detection using nuclear quadrupole resonance 失效
    使用核四极共振的违规检测系统和方法

    公开(公告)号:US06194898B1

    公开(公告)日:2001-02-27

    申请号:US08913086

    申请日:1997-09-05

    IPC分类号: G01V300

    摘要: A system for detecting a target substance within a class of explosives and narcotics containing quadrupolar nuclei through the use of nuclear quadrupole resonance (NQR). The system applies an RF signal to a coil (34) to excite the substance under test. If the target material is present, an NQR signal will be picked up by the same coil, That signal is compared with known NQR signals in frequency and amplitude. A signal is displayed in an appropriate way if a threshold value of the NQR signal is equalled or exceeded. The empty coil is statically tuned by means of adjusting the location or capacitance values, or both, of static tuning capacitors (102) in the coil. The coil is tuned after the specimen is inserted into the coil by means of an auto-tune feature (36). Effective RFI shielding (37) is provided to prevent external contaminating signals from being detected by the coil and to prevent RF signals from escaping from the scanner. The invention also includes the method for performing tests with the system.

    摘要翻译: 一种通过使用核四极共振(NQR)检测一类爆炸物和含有四极核的麻醉剂的目标物质的系统。 系统将RF信号施加到线圈(34)以激发被测物质。 如果目标材料存在,则NQR信号将被相同的线圈拾取,该信号与已知的NQR信号在频率和幅度上进行比较。 如果NQR信号的阈值相等或超过,则以适当的方式显示信号。 通过调节线圈中的静态调谐电容器(102)的位置或电容值(或两者)来静态调谐空线圈。 在通过自动调谐特征(36)将样本插入线圈之后,线圈被调谐。 提供有效的RFI屏蔽(37)以防止线圈检测到外部污染信号,并防止RF信号从扫描仪中逸出。 本发明还包括用该系统进行测试的方法。

    System and method for contraband detection using nuclear quadrupole
resonance including a sheet coil and RF shielding via waveguide below
cutoff
    6.
    发明授权
    System and method for contraband detection using nuclear quadrupole resonance including a sheet coil and RF shielding via waveguide below cutoff 失效
    使用核四极共振(包括片状线圈和RF屏蔽通过波导低于截止值)进行违禁检测的系统和方法

    公开(公告)号:US5592083A

    公开(公告)日:1997-01-07

    申请号:US400679

    申请日:1995-03-08

    摘要: A system for detecting a target substance within a class of explosives and narcotics containing quadrupolar nuclei through the use of nuclear quadrupole resonance (NQR). The system applies an RF signal to a coil to excite the substance under test. If the target material is present, an NQR signal will be picked up by the same coil. That signal is compared with known NQR signals in frequency and amplitude. A signal is displayed in an appropriate way if a threshold value of the NQR signal is equalled or exceeded. The coil is tuned by means of an auto-tune feature. Effective RFI shielding is provided to prevent external contaminating signals from being detected by the coil and to prevent RF signals from escaping from the scanner. The invention also includes the method for performing tests with the system.

    摘要翻译: 一种通过使用核四极共振(NQR)检测一类爆炸物和含有四极核的麻醉剂的目标物质的系统。 系统将RF信号施加到线圈以激发被测物质。 如果目标材料存在,则NQR信号将被相同的线圈拾取。 该信号与已知的频率和幅度的NQR信号进行比较。 如果NQR信号的阈值相等或超过,则以适当的方式显示信号。 线圈通过自动调谐功能进行调谐。 提供有效的RFI屏蔽以防止线圈检测到外部污染信号,并防止RF信号从扫描仪中逸出。 本发明还包括用该系统进行测试的方法。