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Correction of NMR artifacts due to constant-velocity axial motion and spin-lattice relaxation
Correction of NMR artifacts due to constant-velocity axial motion and spin-lattice relaxation
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机译:恒速轴向运动和自旋晶格弛豫引起的NMR伪影的校正
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摘要
NMR spin echo signals are corrected for axial motion of the borehole logging tool. The correction is applied to an averaged echo train using an average velocity determined from surface measurements over the duration of averaging of the echo trains. An additional correction may be applied to correct for excess polarization or incomplete polarization of nuclear spins due to an insufficient wait time between pulse sequences.
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