NQR substance detection using multiple coils

NQR substance detection using multiple coils

To detect nitrogeneous substances such as drugs or explosives, articles are subjected to a sequence of excitation pulses to excite nuclear quadrupole resonance in the nitrogen nuclei. A set of overlapped coils are used (10, figure 2), and the excitation E1-E4 and reception S1-S4 periods for the coil...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: JOHN ALEC SYDNEY SMITH, JULIAN DAVID SHAW
Format: Patent
Sprache:eng
Schlagworte:
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
TESTING
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Beschreibung
Zusammenfassung:To detect nitrogeneous substances such as drugs or explosives, articles are subjected to a sequence of excitation pulses to excite nuclear quadrupole resonance in the nitrogen nuclei. A set of overlapped coils are used (10, figure 2), and the excitation E1-E4 and reception S1-S4 periods for the coils are interleaved so that, for example, the second coil is energised E2 before the response S1 due to the first coil is received.