CAJ | 학술논문

单极型巨磁阻传感器需加偏置磁场才能得到双极输出效果,增加了交流电子式电流互感器传感头的复杂程度和不稳定性.为此,测试分析一种线性双极巨磁阻传感器的输出特性,可为简化交流电子式电流互感器传感头的设计提供新的思路和实验依据.利用安捷伦交直流电源和自制的环形跑道磁体、样品架搭建了静态动态测试平台;通过计算机、Keithley2000万用表、Pt100温度传感器构成的数据采集系统,对巨磁阻的输出信号和温度信号进行实时采集和处理.数据分析结果表明,该线性双极巨磁阻传感器在不用加偏置磁场的情况下可以输出几乎对称的正、负电压,具有相近的静动态线性度和灵敏度,巨磁阻(GMR)输出的电压幅值在关心的谐波电流范围内几乎与频率无关.但饱和区间和零漂会受温度的影响,如果采取一定的补偿措施,可能会在高压电流检测中取代单极巨磁阻传感器而获得更广泛的应用.
단겁형거자조전감기수가편치자장재능득도쌍겁수출효과,증가료교류전자식전류호감기전감두적복잡정도화불은정성.위차,측시분석일충선성쌍겁거자조전감기적수출특성,가위간화교류전자식전류호감기전감두적설계제공신적사로화실험의거.이용안첩륜교직류전원화자제적배형포도자체、양품가탑건료정태동태측시평태;통과계산궤、Keithley2000만용표、Pt100온도전감기구성적수거채집계통,대거자조적수출신호화온도신호진행실시채집화처리.수거분석결과표명,해선성쌍겁거자조전감기재불용가편치자장적정황하가이수출궤호대칭적정、부전압,구유상근적정동태선성도화령민도,거자조(GMR)수출적전압폭치재관심적해파전류범위내궤호여빈솔무관.단포화구간화령표회수온도적영향,여과채취일정적보상조시,가능회재고압전류검측중취대단겁거자조전감기이획득경엄범적응용.
In order to get a bipolar output effect, the unipolar giant magnetoresistance(GMR) sensor must have a bias magnetic field. However, this can make GMR sensor based electronic current transducer more difficult and unsteady. Compared to unipolar GMR sensors, bipolar GMR sensors were presented. A test platform of static and dynamic magnetic field , which consisted of solenoid magnet, sample holder and Agilent current sources, was designed.With the help of computer, Keithley2000 multimeter and Pt100 consisting of a data acquisition system and the software of data process based on Labview could analyze GMR output signals and temperature signals in real-time. The analysis results show that the linearity and sensitivity of static and dynamic states are nearly the same and the amplitude of GMR output is nearly immune to harmonic currents. Although the temperature increase will decrease the saturation region and sensitivity, necessary compensation measures can eliminate the influence of temperature. Thus,the bipolar GMR sensor will be more suit.able for AC electronic current transducer.