各向异性磁阻传感器灵敏度在线辨识技术

提出了一种基于灵敏度在线辨识技术的灵敏度变化补偿方法,使用北京科技大学研制的各向异性磁阻传感器BKMC-21进行了实验研究.结果表明:未采用灵敏度变化补偿技术的磁场测量输出结果在磁力计通电后发生剧烈变化;磁力计输出需30min才能趋于稳定,在此期间灵敏度变化超过20%.采用灵敏度变化补偿技术的磁场测量输出结果在磁力计通电后保持平稳,磁力计输出在整个过程中灵敏度变化不超过2%.由以上实验结果可以看出,本文所提出的基于各向异性磁阻传感器灵敏度在线辨识技术的磁力计灵敏度补偿方法能有效地解决磁力计灵敏度变化问题.

Sensitivity online recognition of anisotropic magnetoresistive sensors

A sensitivity compensation method was proposed for anisotropic magnetoresistive(AMR) sensors based on sensitivity online recognition.An experimental study on this method was carried out with an AMR sensor BKMC-21 developed by University of Science and Technology Beijing.The experimental results show that the magnetic field output of BKMC-21 without sensitivity compensation varies greatly after switching the power supply on.It takes about 30 min to be stable,and during this period the sensitivity variation is over 20%.The magnetic field output of BKMC-21 with sensitivity compensation is stable,and the sensitivity variation is less than 2% after switching the power supply on.It can be concluded that the sensitivity compensation method proposed for AMR sensors based on sensitivity online recognition can effectively solve the sensitivity variation problem of magnetometers.