动态环路法磁矩测量系统标定与误差评估

Calibration and error evaluation of magnetic moment measurement system with dynamic loop method

为保证磁矩和磁心位置测量精度,需要对动态环路法磁矩测量系统进行标定。在分析系统测量误差组成及其影响的基础上,提出了对动态环路法磁矩测量系统标定的方法,即采用以不同大小标准磁体为被测对象的标定方案,利用最小二乘法给出了5个标定系数值。通过测量2组用于模拟真实被测对象的组合磁体,评估了标定后动态环路法磁矩测量系统的实际测量性能。结果表明,标定后的动态环路法磁矩测量系统对偶极磁矩的测量误差不大于4.6%,磁心位置测量误差不大于7.2%。

To ensure the measurement accuracy of the magnetic moment and the magnetic center location, it isnecessary to calibrate the magnetic moment measurement system based on the dynamic loop method. From the analysisof the composition and the influence of the measurement errors, eight calibration coefficients are proposed and used tocalibrate the magnetic moment measurement system. The calibration scheme is designed based on the measurement ofdifferent standard magnets, and then all calibration coefficients are calculated with the least squares method. Two groupcompositional magnetic moments are designed and used to simulate the actual object under test, the actual performanceof the magnetic moment measurement system based on the dynamic loop method is evaluated by the measurement ofcompositional magnetic moments. The test results indicate that the magnetic dipole moment measurement error of themagnetic moment measurement system is not more than 4.6%, and the magnetic center location measurement error isnot more than 7.2%.