Design Of Low-Field Magnet And Probe In NMR Analysis Instrument

All parts of NMR have been studying since appearance of NMR. It is composed of magnetic field and electro circuit which decide whole systemic capability. It is necessary to design magnetic field and electro circuit.The performance of signal reception circuit is one of the key factors for the realization of low-field NMR(nuclear magnetic resonance) signals. Because of low field strength, the NMR signal is quite weak and is of poor SNR(Signal to Noise Ratio). With a view to this, a digital receiver for nuclear magnetic resonance is described in this article. It has a special design based on the characters of low-field NMR.Projects of magnet design in Nuclear Magnetic Resonance are various. A series of problems is to make magnet small, light, stable and having larger uniformity area. Dealing with these problems relys on computing of electromagnetism field. The Paper clarifies these problems ,then optimizing ,analyzing, calculating on these projects from which we choose the best one. At the same time ,a better mothed is applied to regulate uniformity of magnetic area. The magnet which is used in subminiature NMR Rock Analysis Instrument is successfully finished. After testing on site many times, it shows the NMR Rock Analysis Instrument which uses this magnet have high stability.So it can be used under stated condition .