Three Axis Fluxgate Magnetometer Array Calibration Using Nonmagnetic Rotation Platform
Three Axis Fluxgate Magnetometer Array Calibration Using Nonmagnetic Rotation Platform
复制标题
使用非磁性旋转平台的三轴磁通门磁力计阵列校准
作者：
庞鸿锋;陈棣湘;潘孟春
三轴磁通门磁强计阵列是磁测和铁磁目标定位的有力工具。磁强计阵列的主要误差是由传感器三重态偏差引起的。设计了一个由交叉铝框架连接的磁力计阵列，该阵列包含4个三轴DM-050磁通门磁力计。提出了一种方便的阵列标定方法，即绕其轴旋转非磁性旋转平台，并可估计三重态偏差。旋转平台水平部署不严格，旋转角度要求不严格。当阵列以随机姿态部署时，测试了计算三元组偏差的通用性。实验结果表明，校准后的阵列可检测到一个尺寸为15 mm×75 mm×55 mm的铁磁物体，并在三维空间中准确获得该物体的位置。为三轴磁通门磁强计阵列的标定提供了一种方便有效的方法。
Three axis fluxgate magnetometer array can be powerful instruments in magnetic mapping and ferromagnetic object localization. The major errors of magnetometer array are caused by sensor triplet deviations (mutual misalignment). A magnetometer array connected by a cross aluminium frame is designed, which contains four three-axis DM-050 fluxgate magnetometers. A convenient array calibration method is presented by rotating a nonmagnetic rotation platform around its axis, and triplet deviations can be estimated. The horizontal deployment of rotation platform is not strictly, and the rotation angle is not strictly required. The generality of computed triplet deviations is tested when the array is deployed with random attitudes. Experimental results show that RMS error of misalignment has been decreased from 802.216 nT to 9.065 nT. In addition, a ferromagnetic object with the size of 15 mm×75 mm×55 mm is detected by the calibrated array, and its position is obtained accurately in 3D. It suggests a convenient and effective way for the calibration of three axis fluxgate magnetometer array.