NMR probe circuit for generating close frequency resonances

Details NMR probe circuit for generating close frequency resonances NMR probe circuit for generating close frequency resonances

2005-08-23

2005-08-23

Arana, Louis (Department: 2859)

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

C324S318000

Reexamination Certificate

active

06933725

ABSTRACT:
A circuit for a nuclear magnetic resonance probe uses three resonators to create resonances intermediate to the resonator resonant frequencies. The circuit is particularly useful for creating magnetic fields for two closely spaced high frequencies, such as those used for the excitation of1H and19F. The resonators are arranged in a parallel combination, or the electrical equivalent thereof, with input ports connected to it for inputting the desired high frequency resonances. Admittance inverters may be used to provide isolation between the input ports. Some of the resonators and the admittance inverters may be transmission lines. The transmission lines may have additional ports for additional input signals of lower frequencies located at null points for the frequencies of the signals coupled to the primary input ports. Adjustable dielectric components in the resonator transmission lines may be used for tuning purposes.

REFERENCES:
patent: 4833412 (1989-05-01), Zens
patent: 5166621 (1992-11-01), Codrington et al.
patent: 5243289 (1993-09-01), Blum et al.
patent: 5424645 (1995-06-01), Doty
patent: 6686741 (2004-02-01), Hasegawa

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