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Principle of Nuclear Magnetic Resonance Analysis of Oil Content Tester

Time:2020-07-21 11:39:10 Click:

The oil content tester is a high-performance, one-box design product, which has been widely used in the field of seed oil content testing. The product adopts a modular design concept, which can be configured according to user needs to meet the actual needs of factories and scientific research. It has been widely used in food, agriculture, petrochemical, chemical fiber, energy, building materials and many other fields. It can not only meet the requirements of quality management and monitoring in the production process, but also be used in research and development in related fields. The product not only has the characteristics of NMR without special preparation of samples, non-destructive testing, and environmental protection, but also has excellent measurement accuracy and repeatability, fast analysis speed, simple and convenient operation, and is an ideal cost-effective instrument.


Nuclear magnetic resonance has the remarkable advantages of non-destructive testing, multiple parameters and the same number of parameters. When designing a magnet, first determine the type and size of the magnet based on experience, and then use the finite element method to calculate the exact size. The assembled magnet achieves the required uniformity through passive shimming.


The principle of nuclear magnetic resonance analysis of oil content tester:


In a static magnetic field, the magnetic nuclei have different energy levels. Electromagnetic waves of a specific frequency are used to irradiate the sample. When the energy of the electromagnetic waves is equal to the energy level difference, the nuclei absorb the electromagnetic waves and undergo energy level transitions, resulting in a resonance absorption signal. The physical phenomenon of atomic nucleus under the action of another alternating magnetic field, not all atomic nuclei can produce this phenomenon, atomic nucleus can produce nuclear magnetic resonance phenomenon because of its nuclear spin. In NMR spectroscopy, spin-lattice relaxation time T1 and spin-spin relaxation time T2 can be used to describe the process of magnetization returning to an equilibrium state. The difference in NMR spectra can be seen from the difference in relaxation time. NMR signal is a physical phenomenon of emitted electromagnetic radiation, which is proportional to the density of the nucleus. NMR signals are used to reflect the chemical structure of the sample, the diffusion coefficient of molecules or atoms, the reaction rate, chemical changes and other properties.


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