不同长度敏感元件的两种巨磁阻抗传感器传感性能研究

针对采用Co基非晶丝作为敏感元件的传统巨磁阻抗传感器和非对角巨磁阻抗传感器进行比较研究。改变敏感元件的长度,观察两者在直流外磁场作用下输出信号的变化规律,并讨论退磁场等因素对传感器输出信号的影响。结果显示非对角巨磁阻抗传感器具有高灵敏度,无磁滞等优点,且灵敏度随样品长度的减小略有增大,在测量弱磁场方面表现出更大的潜力,为磁敏传感器的小型化提供了一定的参考依据。

Study of the sensing performance of two kinds of Giant magnetoimpedance sensors with different element lengths

A comparative study between conventional giant magnetoimpedance sensor and off-diagonal giant magnetoimpedance sensor using Co-based amorphous wire as sensing element has been investigated.Under the dc external magnetic field the output signals of these two sensors have been measured with the length of sample varying.The influence of demagnetization field and other factors have been also discussed.The results show that off-diagonal sensor has some advantages of high sensitivity,which increases a little with the sample length decreasing,and non-hysteresis.It shows great potential for weak magnetic field detection,which provides some references for the minimization of magnetic sensors.