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Nuclear magnetic resonance analysis principle of oil content tester

:2020-12-03 16:43:16:

Oil content tester is a high performance, one box design product, has been widely used in the field of seed oil content test. The product adopts the modular design concept, and the configuration can be set according to the user's needs to meet the actual needs of the factory 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 the research and development of related fields. The product not only has the characteristics of NMR without special sample preparation, non-destructive testing and environmental protection, but also has excellent measurement accuracy and repeatability, fast analysis speed, simple and convenient operation. It is an ideal high cost performance instrument.

Nuclear magnetic resonance (NMR) has the advantages of nondestructive testing, one machine with multiple parameters and the same multi parameters. In the design of magnet, the type and structure size of magnet should be determined initially according to the experience, and then the accurate size can be obtained by using the finite element method. The assembled magnet can meet the requirement of uniformity by passive shimming.

The principle of nuclear magnetic resonance analysis of oil content tester is as follows

In a static magnetic field, there are different energy levels in the nucleus with magnetism. When the energy of the electromagnetic wave is equal to the energy level difference, the energy level transition of the nuclear absorption electromagnetic wave occurs and the resonance absorption signal is generated. Nuclear magnetic resonance is a physical phenomenon of the nucleus in the static magnetic field under the action of another alternating magnetic field, and not all atomic nuclei can produce it Nuclear magnetic resonance is the nuclear phenomenon. In NMR spectra, spin lattice relaxation time T1 and spin spin relaxation time T2 can be used to describe the process of magnetization returning to equilibrium state. The difference of NMR spectra can be seen from the difference of relaxation time. NMR signal is a physical phenomenon of electromagnetic radiation emitted, which is proportional to the density of the nucleus. NMR signals are used to reflect the chemical structure, diffusion coefficient of molecules or atoms, reaction rate, chemical changes and other properties of the samples.

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