NMR probe head with variable RF resonant circuit capacitor which can be adjusted in steps via a piezo-electric actuator
US9500726B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 4, 2014 |
| Grant date | Nov 22, 2016 |
| Priority date | — |
| Expiry date | Jul 2, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/3628
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An NMR probe head has a capacitor with a dielectric (5), which surrounds a cavity (15) in which a capacitor piston (7) is disposed. A sliding bush (9) has a through hole (16) in which a piston operating rod (8) extends. The piston operating rod (8) is connected to a piezo-electric actuator and to the capacitor piston (7) in such a way that it displaces the capacitor piston linearly when a sawtooth voltage is applied to the piezo-electric actuator. The sliding bush thereby applies braking friction to the piston operating rod during linear displacement of the capacitor piston and only allows the piston operating rod to slide through during the steep edges of the sawtooth voltage. This avoids the disadvantages of prior art, wherein the NMR probe head remains compact and the material cost and manufacturing complexity are reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.