Study on Tunnel Supporting Frame for Nuclear Magnetic Resonance Detecting Impact.

The tunnel supporting frame has a strong impact on the nuclear magnetic resonance detecting. The emission current decreases, at the same time, the establishment of the excitation field and the reception of the signal are also influenced, hence, the detection results is imprecise. Combining with the transformer model, through Kirchhoffs current law, the relationship is obtained between the increasing amount of resistance of emission coin and the decreasing amount of inductance and the supporting frame resistance and inductance. The mutual inductance of supporting frame and the transmitter coil is calculated. According to the addition and the reduction, the resistance and inductance are calculated. Demonstrated by experiment, the measured and calculated results are consistent, the results provide a basis for the inversion of NMR signals. [ABSTRACT FROM AUTHOR]