用数字示波器探究光磁共振实验中反常共振信号的机理

EXPLORING THE MECHANISM OF ABNORMAL RESONANCE SIGNALS IN OPTICAL PUMPING MAGNETIC RESONANCE EXPERIMENT USING DIGITAL OSCILLOSCOPE

本文根据拟合得到的gF因子大小,确定了光磁共振实验中的反常共振信号;用数字示波器测量了反常共振射频信号的频谱,计算了反常共振射频信号各高次谐波的大小;通过线性拟合,得到了正常共振信号幅度与射频信号幅度的关系。利用此关系,计算了各高次谐波产生的反常共振信号大小,计算结果与测量值基本一致。频率计连接射频信号源后,射频信号波形和频谱发生明显变化,反常共振信号随着射频信号频谱的变化发生相应改变,进一步证明了反常共振信号由射频信号的高次谐波共振所引起。这些结果表明,用数字示波器探究光磁共振实验中反常共振信号的机理不仅可行,还能定量估算和预测射频信号波形对反常共振信号大小的影响。

The abnormal resonance signals in optical pumping magnetic resonance experiment were determined according to the value of gF-factor obtained by fitting.The spectra of the abnormal resonance radio-frequency signals were measured using digital oscilloscope,and the magnitudes of the higher harmonics were calculated.The relationship between the amplitudes of normal resonance signals and the ones of radio-frequency signals was obtained by the least squares linear fitting.Using the relationship,the magnitude of the abnormal resonance signal engendered by each higher harmonic was estimated.The calculated results are basically consistent with the experimental ones.The waveforms and the spectra of the radio-frequency signals change obviously after the frequency meter is connected with the radio-frequency signal generator.The abnormal resonance signals change accordingly with the changes in the RF signal spectrum,which suggests that the abnormal resonance signals are caused by the higher harmonic resonances of the radio-frequency signals.These results show that it is not only feasible to explore the mechanism of abnormal resonance signal in optical magnetic resonance experiment by digital oscilloscope,but can also quantitatively estimate and predict the influence of radio-frequency signal waveform on the magnitude of abnormal resonance signals.