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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., Eta2O2) 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 is also disclosed.
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