Methods of and apparatus for nqr testing a sample

Details Methods of and apparatus for nqr testing a sample Methods of and apparatus for nqr testing a sample

G - Physics

01

R

G01R 33/44 (2006.01)

Patent

CA 2307307

Methods of and apparatus for Nuclear Quadrupole Resonance (NQR) testing a sample containing quadrupolar nuclei exhibiting a given value of spin-lattice relaxation time, T1, are disclosed. The off-resonance and the sensitivity of the NQR test may be futher improved by applying excitation (in the form of "bridging pulses") between the two excitation blocks. The method comprises applying two excitation blocks to excite nuclear quadrupole resonance, there being a given delay time between the two blocks, detecting resonance response signals, and comparing the response signals from respective blocks. The delay time is less than the T1 value of the nuclei.

L'invention concerne des procédés et un dispositif qui permettent de tester par résonance quadripolaire nucléaire (NQR) un échantillon contenant des noyaux quadripolaires pour lesquels le temps de relaxation spin-milieu est égal à une valeur T¿1?. On peut encore améliorer la réponse hors résonance et la sensibilité du test NQR en appliquant une excitation (sous la forme d'impulsions "de liaison") entre deux blocs d'excitation. Selon le procédé, on utilise deux blocs d'excitation pour provoquer la résonance quadripolaire nucléaire, un certain retard existant entre les deux blocs; on détecte les signaux de réponse; et on compare les signaux de réponse produits par lesdits blocs. Le retard est inférieur à la valeur T¿1? des noyaux.

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