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1.发明授权Active Q-damping sub-system using nuclear quadrupole resonance and nuclear magnetic resonance for improved contraband detection 有权使用核四极共振和核磁共振的主动Q-阻尼子系统改进违禁品检测公开(公告)号：US06291994B1
公开(公告)日：2001-09-18
申请号：US09483090
申请日：2000-01-14
IPC分类号： G01V300
CPC分类号： G01R33/441 , G01N24/084
摘要： A Q-damping subsystem for either an NQR or NMR contraband detection receiver for effectively reducing the dead time and increasing sensitivity of the contraband detection system. The invention acts as an addition to the standard transmit circuits of NQR and NMR based scanners and spectrometers. The active Q-damping devices require additional circuitry for an NQR/NMR detection receiver and a programming for the control thereof. Typically, the detection receiver generates a high-voltage RF pulse on the order of 200-1000 V with normal operation of 100-300 microseconds in length to provide sufficient magnetic field characteristics to perturb the precessing nuclei. The NQR or NMR detection receiver electronics are very sensitive and have to detect a very weak nuclear induction pulse signal that is in the nano/micro-volt range. The invention encompasses several embodiments of the detection receiver with the Q-damping subsystem which include: a transformer coupled resistive damping circuit; an inductively coupled resistive damping circuit; a shunt capacitor/resistor damping circuit; a grounded shunt capacitor/resistor damping circuit; a common mode choke transient suppression damping circuit; a multi-stage Q-damping circuit; and a full-wave Q-damping circuit.
摘要翻译： 用于NQR或NMR违禁检测接收器的Q-阻尼子系统，用于有效减少违禁检测系统的死区时间和增加敏感度。 本发明作为NQR和NMR扫描仪和光谱仪的标准传输电路的补充。 有源Q阻尼器件需要用于NQR / NMR检测接收器的附加电路和用于其控制的编程。 通常，检测接收器产生大约200-1000V的高压RF脉冲，其长度为100-300微秒的正常操作，以提供充分的磁场特性来扰乱进动中的核。 NQR或NMR检测接收器电子器件非常敏感，必须检测处于纳/微伏范围的非常弱的核感应脉冲信号。 本发明包括具有Q-阻尼子系统的检测接收机的几个实施例，其包括：变压器耦合的阻性阻尼电路; 电感耦合电阻阻尼电路; 分流电容器/电阻器阻尼电路; 接地分流电容器/电阻器阻尼电路; 共模扼流圈瞬态抑制阻尼电路; 多级Q-阻尼电路; 和全波Q阻尼电路。
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