Method and apparatus for tuning and matching an NMR coil
US5036426A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 22, 1990 |
| Grant date | Jul 30, 1991 |
| Priority date | — |
| Expiry date | Feb 22, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01G5/16
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Apparatus for tuning an NMR probe coil (10) to a desired frequency (.omega.) and matching the coil (10) and the apparatus to a desired input impedance (20) comprises a differential capacitor (54, 70, 80, 120) having first, second and third terminals. The capacitance across the first and third terminals of the differential capacitor (54, 80, 120) is constant and is preselected to obtain the desired resonant frequency (.omega.). The capacitance across first and second terminals of the capacitor (54, 70, 80, 120) is variable and is adjusted to obtain the desired input impedance (Z.sub.0) without affecting the capacitance across the first and third terminals thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.