Research On Orthogonal Dual Coil Probe In Non-Steady State Nuclear Magnetic Resonance

As the highest available field,pulsed high magnetic fields provide a new experimental platform for exploring unknown fields.The accurate measurement of the magnetic field is helpful to carry out scientific researches in pulsed high magnetic fields.It is difficult to calibrate the magnetic field because of the rapid change of the pulsed magnetic field,the high peak field,the poor spatial uniformity and the small diameter of the pulsed magnet.Nuclear magnetic resonance(NMR)technology has attracted more and more attention because of its high precision,wide measuring range and small probe.This paper proposes a non-steady state NMR scheme,which based on the development of orthogonal double coil probe.In the time-varying magnetic field,acquire the NMR data when the broadband continuous wave excites the sample.In this paper,the solenoid type orthogonal double coil NMR probe,the saddle type orthogonal double coil NMR probe,micro orthogonal double coil NMR probe was designed.With the help of software,the RF field distribution inside the probe was simulated.In alternating current(AC)time-varying magnetic field,the high-isolation orthogonal double coil probe was designed and made.To verify the performance of the orthogonal double coil probe for AC time-varying magnetic field,the non-steady NMR experiment system was set up.The probe for the pulsed magnet was designed and fabricated.The pulse NMR experiment was done in the pulsed magnet environment to test the performance of the probe for pulsed magnet field.The non-steady NMR phenomenon was observed in the non-steady NMR experiment.Reliability of the self-made orthogonal double coil NMR probe for AC time-varying magnetic field.The NMR signal was successfully observed in the pulsed magnetic field using the probe for the pulsed magnetic field,and the reliability of the probe was verified.At the end of this paper,some improvement measures are put forward,which can be used to observe the of the non-steady state NMR phenomenon in the pulsed magnetic field.