Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1988-11-14
1989-08-15
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324309, G01R 3320
Patent
active
048578444
ABSTRACT:
A method is proposed for the automatic correction of phase errors in NMR spectra. The phase errors are caused inter alia by deficiencies of the NMR hardware, by the shifted sampling of a magnetic resonance signal after the occurrence thereof. Phase correction is performed by determining first the modulus spectrum from a complex magnetic resonance spectrum, after which in the modulus spectrum there are determined, with discrimination of peaks which are below a given level, the peak parameters of the remaining peaks, such as peak amplitude, peak width at half amplitude and peak position, after which, using the peak parameters determined, a model of the complex spectrum is determined which does not contain phase errors, a phase distortion being subsequently introduced into this model until the phase of the model at the edges of the spectrum corresponds as well as possible to the phase at the edges of the complex spectrum, after which finally the complex spectrum is point-wise corrected with the phase distortion introduced. The proposed phase correction does not impose strict requirements as regards the modeling, because up to a given level variations in the modeling hardly influence the phase variation at the edge of the spectrum.
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J. Daubenfield et al., Automatic Intensity, Phase and Baseline Corrections in Quantitative Carbon-13 Spectroscopy, Journal of Magnetic Resonance, vol. 62, pp. 195-208, 1985.
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Briody Thomas A.
Haken Jack E.
Slobod Jack D.
Tokar Michael J.
U.S. Philips Corporation
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