The Development Of Nuclear Magnetic Resonance Based On Embedded Operation System

The Nuclear Magnetic Resonance(NMR)is an important physical phenomenon and it is widely used in physical,chemical,clinical medicine,medicine research and a lot of industrial fields.NMR experiment was first introduced into the teaching syllabus of the modern physical experiment course in comprehensive university made by education ministry in 1980 and it is the one of the compulsory experiments.So it is very important to develop a new NMR experiment instrument integrated in simple structure,low cost and excellent performance,thus can be meaningful in promoting the MNR teaching in domestic universities and institutes.On the basis of NMR Theory,this paper presents an embedded NMR instrument based on ARM microprocessor andμC/OS-Ⅱreal-time operating system.The design of experimental instrument is classified into hardware system design and software system design.In hardware design,LPC2290 microprocessor with ARM architecture is selected in this system as the kernel of the controller,the reduced system including power module,clock module,reset module and JTAG interface circuit is designed,the memory interface circuit,Human-Computer interaction circuit and signal conditioning circuit are developed.In software design,the Boot Loader is analyzed and designed,the RTOSμC/OS-Ⅱis transplanted to MCU LPC2290,thus improving the capability of real time processing of the NMR.Besides that,the man-machine interface MiniGUI and application are implemented.Compared with traditional MNR instrument,the new designed instrument based on ARM is good at real time processing.A powerful GUI of large screen LCD is also brought to the user,which can keep the instrument in convenient operation and high price-performance ratio and also has the high use-value and bright prospect in the market.