Accession Number : ADD016030

Title :   Detection of Explosives by Nuclear Quadrupole Resonance.

Descriptive Note : Patent, Filed 23 May 91, patented 27 Apr 93,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Buess, Michael L ; Garroway, Allen N ; Miller, Joel B

Report Date : 27 Apr 1993

Pagination or Media Count : 11

Abstract : A system and method for detecting a class of explosives and narcotics containing nitrogen in a specimen by nuclear quadrupole resonance which improves the selectivity, sensitivity and spatial localization over conventional detection systems. As a result, sub-kilogram quantities of explosives and narcotics against a background of more benign materials may be detected by the nuclear quadrupole resonance system and method. Also, by the use of a meanderline surface coil, the electrical and magnetic fields will fall off rapidly over a short distance so that a localized region may be scanned and people may be scanned without depositing substantial RF power into the body. Furthermore, by using a strong off-resonance comb (SORC) irradiation sequence, the signal-to-noise ratio of the detected signal is improved for obtaining a more accurate detection signal from the specimen.

Descriptors :   *EXPLOSIVES, *NITROGEN, *NUCLEAR QUADRUPOLE RESONANCE, *PATENTS, *DETECTION, COILS, DETECTION, IRRADIATION, MAGNETIC FIELDS, MATERIALS, NARCOTICS, POWER, QUANTITY, SENSITIVITY, SEQUENCES, SIGNAL TO NOISE RATIO, SURFACES, SPATIAL DISTRIBUTION, ELECTRIC FIELDS, RADIOFREQUENCY

Subject Categories : Atomic and Molecular Physics and Spectroscopy
      Ammunition and Explosives
      Magnetic & Electric Fld Detection & Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE