基于磁场传感器磁成像装置研究

Research on Magnetic Imaging Device Based on Magnetic Field Sensors

针对空间磁场矢量分布情况,给出一种空间磁场测量和成像的装置,主要由磁场矢量传感器、三维移动平台和信号处理电路等部分构成。在待测磁场空间中,通过三维移动平台调整磁场矢量传感器的测量位置,然后利用传感器测量相应位置处的磁场分量(Bx、By和Bz),采用信号处理电路并行对传感器的输出电压进行放大、滤波、调零和A/D转换等处理。在微控制器进行数字滤波和数据传输后,利用软件分析和处理获取的数据,并绘制空间磁场矢量分布图。实验结果表明在一定待测磁场范围内,该磁成像装置能够实现永磁铁附近的空间磁场相应位置的磁场矢量测量,并形成磁场分布图,该装置可以对-1000 Gs~+1000 Gs的磁场进行测量,磁场分辨率为2 Gs,空间分辨率为3 mm3。

According to the distribution of space magnetic field vector,a device used for measuring and imaging space magnetic field is presented,consisting of a magnetic field vector sensor,a 3-D moving platform and a signal processing circuit.The measurement to the magnetic field components(B_(x),B_(y)and B_(z))at the corresponding position can be achieved by using the three-dimensional moving platform to adjust the measuring position of the magnetic sensor,the output voltage of the sensor is amplified,filtered,zeroed and A/D transformed by the signal processing circuit in parallel.The space magnetic field vector distribution map can be plotted by utilizing soft-ware of analyze and process the acquired data after digital filtering and data transmission by the microcontroller.The experimental re-sults show that it is possible to realize the measurement to the magnetic field vector at the corresponding position near the permanent magnet and form the magnetic field distribution map in a certain range of magnetic field to be measured,and the device can measure magnetic fields from-1000 Gs to+1000 Gs with a magnetic field resolution of 2 Gs and a spatial resolution of 3 mm^(3).