VTMR TD-NMR Cross-linking Density Analyzer NMR and MRI System for Polymer Product Description EDUMR is a desktop NMR device designed for MRI experimental teaching. Courses to teach NMR principles and experiments through MRI demonstration can be created by including EDUMR in physical corresponding majors (modern physics, applied physics, radio physics, electronic engineering, etc.) or medical corresponding majors (large-scale medical apparatus, medical imaging technology, biomedical engineering, etc.). Extensive experimental courses and majors like NMR engineering related to hardware structure can also be established with through the use of EDUMR. Basic Parameters: Magnet type: permanent magnet; Magnetic field intensity: 0.5±0.08T; Probe coil: Ø15mm; Weight: 138Kg; Applications: 1.NMR analyzing and imaging mechanism Basic NMR analyzing and imaging mechanism NMR phenomenon Relaxation and NMR signal Spatial orientation of NMR signal NMR image reconstruction Pulse sequence 2.MRI system Magnet body system RF(radio frequency) system Gradient field system Spectrometer and computer system Magnetic shielding and RF shielding Pulse sequence 3.NMR&MRI Principium experiments Mechanical and electronic shimming Lamor frequency measurement by hard pulse FID sequence FID sequence signal in rotating coordination system 1D-processing and gain adjustment of FID signal Hard pulse RF measurement with hard pulse echo sequence Soft pulse RF measurement with soft pulse FID sequence Soft pulse echo sequence T1 relaxation time measurement using inversion restoring method T1 relaxation time measurement using saturation restoring method T2 relaxation time measurement using hard pulse CPMG sequence Chemical shift measurement of alcohol 4.MRI experiment Spin-echo sequence MRI PD（portion density）/T1/T2 weighted imaging(Spin-echo sequence) ID gradient encoding imaging Inversion restoring sequence MRI 2D gradient echo sequence MRI Effect of parameter setting on image size and shape 3D echo sequence MRI 5.Hardware structure Tuning and matching of RF(radio frequency) coil RF switch and pre-amplifier RF power amplifier and RF waveform modulator circuit Data processing experiment (simulation) Gradient amplifier Structure and control signal of spectrometer system High frequency digit storage oscilloscope test 6.Advanced experiments Simulation of 2D-FFT image rebuilding Image quality evaluation Simulation of 3D-FFT image rebuilding Fluorine content measurement of toothpaste Oil content measurement of sesame