NMR MAS electret spin rate detection
US7196521B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 15, 2006 |
| Grant date | Mar 27, 2007 |
| Priority date | — |
| Expiry date | Mar 15, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/307
- WIPO fieldMeasurement
- WIPO sectorInstruments
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 B0 is negligible.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.