G - Physics – 01 – R
Patent
G - Physics
01
R
G01R 33/20 (2006.01) G01R 33/44 (2006.01)
Patent
CA 2150459
Acoustic ringing and adverse effects from variations in the NQR detection of explosives and narcotics are minimized or eliminated. A specimen (1) is irradiated with a modified shady state free precession (SSFP) pulse sequence which combines a phase-alternated pulse sequence (DAPS) with a non-phase-alterned pulse sequence (NPAPS). The resulting signals from the PAPS and NPAPS may then be coadded to cancel out the FID contributions to the signals. By canceling out the Fm contributions to the signals, the effects of probe ringing and other extraneous responses, as well as the effect of temperature variation, arc minimized or removed. The present method is especially effective in the detection of explosives and narcotics having 14N or 35,37C1 nuclei. A steady state free precession pulse which is especially useful with the method of the present invention is the strong off resonance comb (SORC). In another embodiment of the invention, the effects of probe ringing can also be minimized or removed by repeating the detection procedure at a frequency which is sufficiently off-resonance so that only frequency independent effects, such as probe-ringing, can be observed.
Buess Michael L.
Garroway Allen N.
Yesinowski James P.
Government Of The United States Of America As Represented By The
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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