时间差型磁通门灵敏度及稳定性研究

摘要

为了提高时间差型磁通门的灵敏度及稳定性，当敏感单元及检测电路确定时，激励信号参数选取和时间差数据处理成为了关键。文中在建立磁通门灵敏度随正弦激励信号参数变化模型的基础上，选取参数条件提高灵敏度，并针对时间差存在随机波动，提出了将变系数拉依达准则与等权端点平滑相结合的时间差混合处理方法，能够实时动态地处理时间差数据。结果显示在±4×104 nT范围内灵敏度达到550 ns／nT，时间差波动可降低93％。实验结果表明，灵敏度变化模型能够有效地指导选取激励参数来提高灵敏度，并结合混合处理算法，减小了时间差波动，增强了磁通门的稳定性。%In order to improve the sensitivity and stability of residence times difference fluxgate ,when the sensitive unit and the detecting circuit are determined ,the selection of excitation signal parameters and the processing of residence times difference are critical.The model of fluxgate sensitivity with the change of sinusoidal excitation parameters was established .Based on the mod-el,the excitation conditions were selected to increase sensitivity .Aiming at the random fluctuations in residence times difference ,the combinatorial processing algorithm which combined the variable coefficient Pauta criterion and the equal weights sliding average was proposed .The algorithm could deal with real-time dynamic times difference .The results show that the sensitivity is set to 550 nsT,the fluctuation of residence times difference is reduced by 93%in the range of ±4×104 nT.It is proved that the sensitivity model has the guidance function in selecting excitation conditions effectively ,combining with the processing method ,the fluctuation of residence times difference is reduced and the stability of the fluxgate is improved .