Nuclear quadrupole resonance testing

Electricity: measuring and testing – Particle precession resonance

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G01V 300

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active

061278246

ABSTRACT:
Methods of testing a sample in which long composite pulses comprising a sequence of short closely spaced pulse elements are disclosed. The pulses generate a qualitatively different response characteristic, which can be tailored as desired by suitable adjustment of the pulses. Near sinusoidal dependence on pulse length can be attained, and effective, efficient, inversion pulses can be produced. Typically each pulse element generates a small flip angle of a few degrees, and the sequence conatins tens or even hundreds of elements. Similar excitation and effects may be produced by amplitude modulating a carrier, rather than switching pulses on and off; there is little discernible difference in the excitation seen by the sample.

REFERENCES:
patent: 5365171 (1994-11-01), Buess et al.
patent: 5521504 (1996-05-01), Cory et al.
patent: 5608321 (1997-03-01), Garroway et al.
patent: 5804967 (1998-09-01), Miller et al.
patent: 5814987 (1998-09-01), Smith et al.
A Handbook of Nuclear Magnetic Resonance 1987, pp. 207-215, R Freeman, "Selective Excitation".
Z Naturforschung 1990, vol. 45a, pp. 581-586, A Ramamoorthy et al., "Numerical Design of Composite Pulses for Polycrystalline Samples in Pulsed NQR Spectroscopy".
Molecular Physics 1994, vol. 83 N.sup..degree. 2, pp. 193-210, S Z Ageev et al., "Composite pulses in nuclear quadrupole resonance".
J. of Magnetic Resonance 1993, vol. 104, pp. 203-208, N Sunitha Bai et al., "Numerical Design of Composite Excitation Pulses for NQR Spectroscopy".
Chemical Physics Letters, vol. 202 N.sup..degree. 1,2, pp. 82-86, Geng-Ying Li et al., Composite pulse excitation for spin-1 pure nuclear quadrupole resonance spectroscopy in powders.
European Convention on Security and Detection, Conference Publication 1995, pp. 288-292, J A Smith, "Nitrogen-14 Quadrupole Resonance Detection of RDX and HMX Based Explosives".
J. of Magnetic Resonance 1994, vol. 107, pp. 8-13, N. Reddy et al., Application of Extended-Time-Excitation Technique to NQR Spectroscopy. An Experimental Investigation of Zeeman-Perturbed Spin-Echo-Envelope Modulation.
Letters to the J. of Experimental & Theoretical Physics 1991, vol. 54 Issue 8, pp. 464-466, V L Ermakov et al., "Echo in the Effective Field of a Multi-Pulse NQR-Sequence".
J. of Molecular Strucuture 1989, vol. 192, pp. 333-344, A Ramamoorthy et al., "Design of Composite Pulses for Nuclear Quadrupole Resonance Spectroscopy".
Z Naturforschung 1992, vol. 47a, pp. 382-388, C Gonzales et al., "Two-dimensional Exchange Spectroscopy Using Pure NQR".

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