NMR MAS electret spin rate detection
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United States of America Patent
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Mar 27, 2007
Grant Date -
Oct 5, 2006
app pub date -
Mar 15, 2006
filing date -
Mar 29, 2005
priority date (Note) -
Expired
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Abstract
A material having a permanent external diametrical electric field is included within an NMR MAS spinner. Such materials include ferroelectret porous films, in which the electric polarization arises from opposite mono-polar charges on separated surfaces within a structured material containing voids. Rotation of electrically polarized material produces a time-dependent electric field, modulated at the rotational frequency, so that a simple antenna achieves high sensitivity and phase stability in spin rate detection. The electrically polarized material is also of sufficiently high resistivity that modulation of the external NMR polarizing magnetic field B.sub.0 is negligible.
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