NMR frequency locking circuit
US5166620A · kind A · utility
38Cited by
1References
28Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 7, 1990 |
| Grant date | Nov 24, 1992 |
| Priority date | — |
| Expiry date | Nov 7, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/389
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An NMR locking mechanism for use with not only electromagnets, superconducting magnets and permanent magnets, but also with ultrahigh energy product magnets such as neodynium. The circuit utilizes a single conversion superheterodyne receiver with a phase locked loop that forms a locking mechanism that depends upon a variable frequency. The resonant frequency of the nuclei is compared to a variable excitation frequency which is adjusted to maintain a control frequency with one unique value of the control frequency being zero at lock.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.