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Method and device for improving NMR spectral resolution in non-uniform magnetic field

A non-uniform magnetic field, high-resolution technology, which can be used in the analysis of nuclear magnetic resonance, the measurement of magnetic variables, medical science, etc., and can solve problems such as insufficient differentiation.

Active Publication Date: 2013-08-28
PRAD RES & DEV LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This resolution is insufficient to distinguish the chemical shifts of water from those of fats and / or aromatics, which differ by only a few ppm

Method used

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  • Method and device for improving NMR spectral resolution in non-uniform magnetic field
  • Method and device for improving NMR spectral resolution in non-uniform magnetic field
  • Method and device for improving NMR spectral resolution in non-uniform magnetic field

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Embodiment Construction

[0024] As mentioned above, nuclear magnetic resonance (NMR) chemical shifts are a useful measurement that can be used to distinguish one chemical compound from another. However, the applicability of the measurement method is limited by inhomogeneities in the magnetic field. Many magnets, especially those used in logging applications, include pre-machined, magnetized plates, and can have field uniformity no greater than a few parts per million (ppm), if so, these few ppm are due to due to design and limited manufacturing precision. Even if the field uniformity of a magnet could be improved during machining, it is unlikely that a magnet will retain such a uniform adjustment after it is installed in a tool and operated in an environment of varying temperatures. It is therefore an object of aspects and embodiments of the present invention to provide a method for improving NMR spectral resolution in the presence of a non-uniform magnetic field. Embodiments of the method may provi...

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Abstract

The invention relates to a method and a device for improving spectral resolution measured by NMR under the condition of a non-uniform magnetic field. According to one embodiment, the method used for aiming at a high resolution nuclear magnetic resonance (NMR) spectrum generated by a sample in the non-uniform magnetic field comprises the following steps: generating a first magnetic pulse and a second magnetic pulse, existing a first period of time between the first magnetic pulse and the second magnetic pulse in time, and in the first period of time, generating a gradient pulse; aiming at different values of the magnetic-field intensity of the gradient pulse, repeatedly generating the first magnetic pulse, the second magnetic pulse and N times of steps of the gradient pulse, wherein the N is an integer more than one; and acquiring a signal from the sample after each second magnetic pulse, and generating a reconstructed high resolution NMR spectrum according to the acquired signal.

Description

technical field [0001] The invention relates to a nuclear magnetic resonance measurement method, and more particularly, to a method for improving spectral resolution in the presence of a non-uniform magnetic field. Background technique [0002] Nuclear Magnetic Resonance (NMR) spectroscopy is one of the most common methods used to characterize molecular species, functional groups and structures. NMR spectroscopy techniques are well described in the literature. Typically, NMR equipment may include the generation of a static magnetic field (commonly referred to as B 0 ) array of permanent magnets, and capable of generating an oscillating magnetic field (commonly referred to as B 1 ) of the NMR antenna (often including a radio frequency (RF) coil). static field B 0 and oscillating field B 1 approximately perpendicular to each other. B 1 Antenna capable of Lamor frequency f L send and receive signals at f L can be given by the following formula: [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N24/08A61B5/055G01R33/465
Inventor 宋一桥
Owner PRAD RES & DEV LTD
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