Technique for amplitude alignment of NMR spectrometer using multiple pulse sequence that is independent of RF inhomogeneity
US5260654A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 30, 1992 |
| Grant date | Nov 9, 1993 |
| Priority date | — |
| Expiry date | Mar 30, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/246
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The quadrature channels of an RF generator in an NMR spectrometer are aligned relative to one another by applying pulse sets to pairs of channels that are 180.degree. out of phase. The effect of the pulses in one channel is the opposite of the pulses in the other channel. As a result, the magnetization of the sample returns to the direction in which it started when the amplitudes of the pulses applied to each channel are equal. The magnetization returns to the initial direction even in the presence of RF inhomogeneities. The characteristic magnetization pattern can be easily observed and used to adjust the relative pulse amplitudes equal and the absolute pulse amplitudes to .pi./2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.