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Detecting hazardous materials in containers utilizing nuclear magnetic resonance based measurements
Detecting hazardous materials in containers utilizing nuclear magnetic resonance based measurements
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机译:利用基于核磁共振的测量来检测容器中的有害物质
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摘要
A method of detecting hazardous materials in containers utilizing nuclear magnetic resonance (NMR) technology. The presence of precursors (e.g., H202) and/or nitrogen in the liquid in the container is determined by placing the container in a static magnetic field, exciting the container with electromagnetic pulses having a frequency corresponding to proton NMR and 14N NMR, and receiving radio frequency (RF) signals through a probe. The excitation pulses are configured to enable detection of the presence of precursors and nitrogen in the container, and may comprise a sequence of short RF pulses. The presence of nitrogen and/or explosive precursors is determined by detecting and evaluating NMR measurement signal amplitudes and relaxation times from the received RF signals. An apparatus comprising a magnet that generates a magnetic field and a probe that generates RF pulses and receives NMR measurement signals from the sampled container in accordance with the aforementioned method.
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机译:一种利用核磁共振(NMR)技术检测容器中有害物质的方法。容器中液体中前体(例如,H 2 O 2)和/或氮气的存在是通过将容器置于静磁场中,用具有对应于质子NMR和14N NMR的频率的电磁脉冲激发该容器并接收来确定的通过探头的射频(RF)信号。激发脉冲被配置为使得能够检测容器中前体和氮的存在,并且可以包括一系列短RF脉冲。氮和/或炸药前体的存在是通过从接收到的RF信号中检测和评估NMR测量信号幅度和弛豫时间来确定的。根据上述方法,该装置包括产生磁场的磁体和产生RF脉冲并从采样容器接收NMR测量信号的探针。
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