基于旋转装置的磁梯度张量测量方法

Magnetic Gradient Tensor Measurement Method Based on Rotating Device

磁梯度张量是目前磁信息应用领域的研究热点,尤其在探测未爆弹(UXO)方面,具有更好的反演能力.本文提出了一种基于旋转装置的磁梯度张量测量方法,基于该方法的测量系统包含两个单轴磁力仪和一个旋转装置,两个磁力仪在相互平行的两个平面上,它们的敏感轴共线,但方向相反,且与平面存在固定夹角.测量时,两个磁力仪饶与平面垂直的同一个轴旋转,旋转半径相同,利用磁力仪的输出可解算得到磁梯度张量.该方法可减少磁梯度张量测量系统的磁力仪数量,从而节约成本,降低系统误差.仿真结果表明,基于该方法的测量系统可有效测得磁梯度张量,且测量精度优于十字形轴向差分测量阵列.

Magnetic gradient tensor has become a research hotspot in the field of magnetic information application,especially in the detection of unexploded ordnance(UXO),which has better inversion ability.Therefore,The method based on rotating device is proposed to measure the magnetic gradient tensor.The measurement system based on this method consists of two uniaxial magnetometers and a rotating device.The two magnetometers are separately on two parallel planes,and the sensitive axes are collinear but in opposite directions,and have fixed angle with the plane.When measuring,the two magnetometers rotate on the same axis that is perpendicular to the plane with the same radius.The magnetic gradient tensor can be calculated by using the output of the magnetometer.This method can reduce the number of magnetometers for composing measurement system,save the cost and reduce the system error.The simulation results show that the magnetic gradient tensor can be measured effectively by the measurement system based on this method,and the measurement accuracy is better than that of the cross-shaped axial differential measurement array.