Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1991-07-09
1993-11-16
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324307, G01R 3320
Patent
active
052627233
ABSTRACT:
A signal function S(t.sub.1, t.sub.2) is obtained from a plurality of coherence transfer pathways in a single acquisition by preparing a molecular system in a coherent non-equilibrium state, and alternately and sequentially detecting signals at individual sampling points, in t.sub.2, from the plurality of coherence transfer pathways by using gradient refocusing of a new pathway after signal detection at a sampling point in another pathway. A frequency domain spectrum S(.omega..sub.1,.omega..sub.2) is constructed by first Fourier transforming the time domain signals S(t.sub.1, t.sub.2) in the t.sub.2 dimension and producing real and imaginary components which modulate as sine and cosine signals in t.sub.1. The real (.omega..sub.2) cosine (t.sub.1) components are combined with the imaginary (.omega..sub.2) sine (t.sub.1) components to form a complex data set S(t.sub.1, .omega..sub.2) that is amplitude modulated in t.sub.1. The complex data set is then Fourier transformed in the t.sub.1 dimension to construct in frequency domain spectrum S(.omega..sub.1, .omega..sub.2) which contains pure absorption lineshapes.
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Hurd Ralph E.
John Boban K.
Plant Harris D.
General Electric Company
Mah Raymond Y.
Tokar Michael J.
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