Phase-alternated carr-purcell nmr echo sequence

Details Phase-alternated carr-purcell nmr echo sequence Phase-alternated carr-purcell nmr echo sequence

G - Physics

01

V

G01V 3/32 (2006.01)

Patent

CA 2570147

A phase alternated Carr Purcell (PACP) sequence is effective in removing DC offset from spin echo signals in earth formations. Modifications of PACP sequences, possibly in combination with other pulse sequences, can remove both DC offset and ringing. Such sequences may be used where the ringing is non- repeatable.

L'invention porte sur une séquence Carr-Purcell à alternance de phase ("phase alternated Carr Purcell" ou PACP) qui permet d'éliminer efficacement la tension de décalage continue ("DC offset") des signaux d'écho de spin dans les formations géologiques. Des modifications des séquences PACP, éventuellement combinées à d'autres séquences d'impulsions, permettent d'éliminer la tension de décalage continue et les oscillations parasites. On peut utiliser des séquences telles que les séquences précitées, dans lesquelles les oscillations parasites ne sont pas répétées.

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