Design Of Data Communication Module For The Shim Power Supply In NMR System

NMR(Nuclear Magnetic Resonance) technology is a powerful tool in researching the micro-and-macro structure of materials and interaction for physics,chemistry,life science,materials Science,environmental science and other subjects,which has made important contributions to modern science and human civilization.NMR spectrometer as a platform for nuclear magnetic resonance technology is widely used in scientific research,education,production,health and all areas of human life,and plays a more and more important role.The developed countries attach great importance to the research and production of the high resolution NMR spectrometer. The annual product income of high resolution NMR spectrometer is several billion dollars.However,the high resolution NMR spectrometer is totally dependent on import in our country.Therefore,developing the high resolution NMR spectrometer with the independent intellectual property is very important.This article focuses on the design of room temperature shim power supply in NMR spectrometer by taking the "300MHz～500MHz NMR Spectrometer Development" as the research project.The design of shim power supply communication module is focused in this paper.According to the requirement of project description,the shim power supply,communication module has two design schemes:serial communication and Ethernet communication.The serial communication module uses STC89C58RD MCU as a microprocessor to realize the serial communication between shim power supply and computer.Ethernet communication module uses FPGA embedded Niosii cpu core to custom SOPC system to realize Ethernet communication between computer and shim power supply through the Ethernet controller DM9000AE.The research work of this article includes designing schematic diagram and PCB,welding circuit and debugging circuit.The target design objectives and design requirements are fulfilled in testing.