一种正弦波磁通门传感器激磁系统的设计

Design of Excitation System for Fluxgate by Sine Wave

针对方波激励磁通门易出现谐波干扰问题,提出一种采用正弦波激励磁通门的激磁系统。给出了总体设计方案,设计了信号发生器,信号调理电路和功率放大电路,并给出了激磁信号波形、频率和电流等关键参数的设计性能指标。搭建了系统测试平台,分析了在不同激磁波形下磁通门传感器的输出波形变化,实验结果表明:应用本系统能够得出正弦激励下磁通门最佳灵敏度的激磁工作频率为16 k Hz,在此激励作用下,测试平台测得磁通门传感器的灵敏度是110 V/T。

Aiming at the problem that a flux-gate sensor excited by the square wave would be interfered by harmon-ics,a fluxgate excitation system based on a sine wave excitation is presented. The system overall scheme,also withthe detailed signal generator design,signal conditioning circuit,and the power amplifier circuit,are all given in thispaper. At the same time,the key parameters of the excitation signal waveform,like frequency and current designperformance indexes,are also presented. The system test platform is Build and the analysis of the flux-gate sensoroutput waveform variation under different excitation is also illustrated. The results of the experiment show that：theproper frequency of the fluxgate under the sine wave excitation is 16 k Hz measured by the testing platform. Withthis excitation condition,the sensitivity of the flux-gate sensor is 110 V/T.