Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1995-03-24
1996-08-13
Tokar, Michael
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324318, G01R 3320
Patent
active
055460003
ABSTRACT:
A method of reducing radiation damping during free induction decay in NMR measurements of samples having a narrow line width uses the active switching of the quality factor value of the coil circuit of an NMR detection probe. After application of an excitation pulse to the sample, data acquisition is accomplished in periodic samples. The Q of the coil circuit is set to a high value while each sample is being taken, but is reduced significantly in between samples by detuning the coil circuit. Minimization of the high-Q state of the coil circuit and maximization of the difference between the high Q value and the low Q value greatly decrease the detrimental effects of radiation damping on free induction decay. The coil circuit Q is modified automatically by the application of a Q switching signal generated by a controller, such as a computer which controls other aspect of the NMR experiment.
REFERENCES:
patent: 4646017 (1987-02-01), Brown
patent: 4725779 (1988-02-01), Hyde et al.
patent: 4769605 (1988-09-01), Fox
patent: 5172061 (1992-12-01), Crooks et al.
patent: 5285161 (1994-02-01), Rzedzian et al.
Cory David G.
Laukien Frank H.
Maas Werner E.
Bruker Instruments, Inc.
Tokar Michael
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