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《Physics Experimentation》 2015-01
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Influence of the modulation magnetic field on nuclear magnetic resonance measurement

LI Chao-rui;School of Physics and Engineering,Sun Yat-sen University;  
The resonance absorption was generated using a magnet with the low-frequency modulation field in the continuous wave nuclear magnetic resonance experiment.When the loop area vertical to magnet was not zero,the flux in the closed loop caused by the modulation magnetic field was changed,then the induced electromotive force would be added to the nuclear magnetic resonance signal.Because the rising and falling of the modulation field induced opposite electromotive forces,the resonance absorption signals for the first and second half period of the modulation field were different.The experiment showed that the reason for the influence from magnitude and orientation of modulation field was not attributed to its physics but the defect of measurement technique.
【Fund】: 国家基础科学人才培养基金资助项目(No.J1103211);; 广东省高等教育教学改革资助项目(No.BKZZ2011001)
【CateGory Index】: O482.532-4;G642
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