Doubly broadband triple resonance or quad resonance NMR probe circuit
US5424645A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 18, 1993 |
| Grant date | Jun 13, 1995 |
| Priority date | — |
| Expiry date | Nov 18, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/3628
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A single NMR sample coil of inductance L.sub.S, in series with a mid-frequency (MF) tuning inductor grounded at one end, is doubly broadbanded using a first high-voltage broadband capacitor matching network in series with the two coils for the LF tuning and a second high-voltage broadband capacitor matching network connected to the junction between the two coils for the MF tuning. Isolation between the MF and LF ports is achieved by proper choice of a plug-in isolation capacitor between the two broadband matching networks. An inductively coupled floating HF tank circuit is inserted in series with one of the leads from the sample coil to produce the triple resonance circuit. The tuning elements for this HF tank are mounted on top of the adjacent broadband matching network. A second floating HF tank circuit may be inserted in series with the other lead from the sample coil to produce a balanced-HF triple resonance circuit or an unbalanced quad-resonance circuit. The tuning elements for the second HF tank circuit are mounted on top of the other broadband matching network. The inductors used in the HF tank or tanks each have inductance less than L.sub.S. The MF tuning inductor has indu…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.