Fourier transform nuclear magnetic resonance spectrometer

Details Fourier transform nuclear magnetic resonance spectrometer Fourier transform nuclear magnetic resonance spectrometer

1979-07-18

1982-03-23

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01N 2700

Patent

active

043215378

ABSTRACT:
In a Fourier transform nuclear magnetic resonance spectrometer, as is known, a pulse modulated radio frequency is applied to a sample placed in a magnetic field, and a free induction decay signal resulting from the above application is Fourier transformed to obtain a nuclear magnetic resonance spectrum. In such a spectrometer, a material having a predetermined resonance peak, for example, tetramethylsilane is used as a reference sample, and the center frequency of the pulse modulated radio frequency is successively varied while maintaining a constant magnetic field intensity. The position of peak of tetramethylsilane in frequency spectra thus obtained is varied with the change of the center frequency. By measuring successively the signal strength of the peak, there can be obtained a frequency characteristic of a receiving system employed in the spectrometer, which is used to obtain correction coefficients of the receiving system. By multiplying a frequency spectrum of a sample to be analyzed by the correction coefficients, the frequency characteristic of the receiving system is corrected, and thus the signal strength of the frequency spectrum can be indicated with high accuracy.

REFERENCES:
patent: 3475680 (1969-10-01), Anderson et al.
patent: 3810001 (1974-05-01), Ernst
patent: 3873909 (1975-03-01), Ernst
patent: 4065714 (1977-12-01), Hill

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