NMR probe circuit with nodal impedance bridge

Details NMR probe circuit with nodal impedance bridge NMR probe circuit with nodal impedance bridge

2007-03-06

2007-03-06

Arana, Louis M. (Department: 2859)

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

C324S318000

Reexamination Certificate

active

11053452

ABSTRACT:
A nuclear magnetic resonance (NMR) probe circuit is used with a sample coil tuned to a primary frequency f1. The circuit is arranged to have a plurality of points of electric field minima at the f1frequency. One or more additional frequencies may be coupled to the circuit at these points, without interaction with f1. The probe circuit also uses an impedance coupled between two of the minima points that affects the frequency response at the additional frequency or frequencies, without affecting the frequency response at f1. The impedance may be made adjustable to allow tuning of the relative frequency resonances.

REFERENCES:
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patent: 5036426 (1991-07-01), Shen
patent: 5861748 (1999-01-01), Schaefer et al.
patent: 6617851 (2003-09-01), Bergmann
patent: 6794874 (2004-09-01), Hasegawa
F. David Doty, George Entzminger, Y. Andy Yang, Magnetism in High-Resolution NMR Probe Design. II: HR MAS; Concepts in Magnetic Resonance,vol. 10(4) 239-260 (1998).

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