Electricity: measuring and testing – Particle precession resonance
Patent
1995-03-08
1997-01-07
O'Shea, Sandra L.
Electricity: measuring and testing
Particle precession resonance
324318, G01V 308, G01V 310
Patent
active
055920837
ABSTRACT:
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.
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Magnuson Erik E.
Moeller Charles R.
Shaw Julian D.
Sheldon Alan G.
O'Shea Sandra L.
Phillips Roger C.
Quantum Magnetics Inc.
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