Patent ID: 6208136
Filing Date: 2001-03-27
Classification: G01R

Abstract:
A method of nuclear quadrupole resonance testing a sample containing quadrupolar nuclei, which sample may give rise to spurious signals which interfere with response signals from the quadrupolar nuclei, comprising:applying a pulse sequence to the sample to excite nuclear quadrupole resonance, the pulse sequence comprising a plurality of pairs of pulses, each of said plurality of pairs of pulses comprising two member pulses;detecting, for each of said plurality of pairs of pulses, respective response signals following the two member pulses of the pair; andcomparing, for each of said plurality of pairs of pulses, said respective response signals following the two member pulses of the pair;the pulse sequence being such that respective spurious signals following the two member pulses of each of said plurality of pairs of pulses can be at least partially cancelled by the comparison without the corresponding true quadrupole resonance signals being completely cancelled; andfor each of said plurality of pairs of pulses, the two member pulses being of like phase.