Method of tuning an NMR apparatus
US4543529A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 4, 1983 |
| Grant date | Sep 24, 1985 |
| Priority date | — |
| Expiry date | Jan 4, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/3628
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of tuning an NMR spectrometer is disclosed that includes the step of locating a specimen in a stationary magnetic field, generating a 90.degree. alternating magnetic field excitation pulse at the Larmor frequency of the selected nuclei of the specimen followed by one or more 180.degree. alternating magnetic field refocusing pulses of preselected duration at fixed time intervals having the same phase relationships using a free-running oscillator that is turned off between pulses, measuring the primary echo train of a selected nuclear magnetic resonance signal, changing the strength of the stationary magnetic field to change the Larmor frequency of the selected nuclei, repeating the pulsing step and the measuring step until the maximum primary echo is obtained, and while holding the stationary field at that strength, measuring the desired nuclear magnetic resonance characteristic using the spin-echo method and the free-running oscillator to supply the pulses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.