Use of amplitude and/or phase modulated nmr pulse sequences...

Details Use of amplitude and/or phase modulated nmr pulse sequences... Use of amplitude and/or phase modulated nmr pulse sequences...

G - Physics

01

V

G01V 3/32 (2006.01) G01R 33/46 (2006.01) G01R 33/44 (2006.01)

Patent

CA 2463534

The excitation and/or refocusing pulses used in a CPMG sequence have a nonlinear phase and an envelope with no zero crossings and a corresponding frequency spectrum with sidelobes suppressed. As a result of this, peak power requirements are reduced. Pulse shaping is used for reducing the peak power requirements of a NMR logging tool.

La présente invention concerne les impulsions d'excitation et/ou de refocalisation utilisées dans une séquence CPMG se distinguant par une phase non-linéaire et une enveloppe sans transition à zéro, les lobes latéraux du spectre de fréquences correspondant étant supprimés. Il en résulte une moindre demande d'énergie en pointe. On a recours à la mise en forme des impulsions pour réduire la demande d'énergie en pointe d'un appareil de diagraphie à RMN.

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