G - Physics – 01 – R
Patent
G - Physics
01
R
324/1
G01R 33/24 (2006.01) G01N 24/08 (2006.01) G01R 33/44 (2006.01) G01V 3/14 (2006.01)
Patent
CA 1207835
BAGGAGE INSPECTION APPARATUS AND METHOD FOR DETERMINING THE PRESENCE OF EXPLOSIVES Abstract This method and apparatus are directed to baggage inspection, and more particularly, baggage inspection to locate explosives. In the preferred and illustrated embodiment, a conveyor system is utilized to transport a bag past a first magnet to achieve an initial nuclear magnetic resonance (NMR) polarization of a selected element. The element in the preferred embodiment is hydrogen, it being noted that hydrogen in explosives has a long T1 and a short T2. The first magnet provides an initial polarization. The bag continues on the conveyor belt past a second magnet. The second magnet provides the measurement field intensity and a coil contains an interacting RF forming the interrogation pulses. Echoes are received. In the preferred embodiment, first and subsequent second echoes are received and stored. The two signals are subtracted from one another to a null. The NMR response of elemental hydrogen in compounds typified by explosives is accented by subtraction of the two stored signals to form a response indicative of explosive materials. The apparatus permits adjustment and to the magnetic field to accommodate distortions for metal in the baggage.
452037
de Los Santos Armando
Hornung Phillip A.
King James D.
Matzkanin George A.
Rollwitz William L.
Meredith & Finlayson
Southwest Research Institute
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