Compensation for magnetic moment measurement error of dynamic loop method

Dynamic loop method is a magnetic moment measurement method using eccentric magnetic dipole model, which can calculate the dipole magnetic moment values and position of the target object through the magnetic flux generated by the object. If the magnetic flux is not compensated, the measurement error is very large. Based on the analysis of the sources and characteristics of the instrument error, equipment error and random error of dynamic loop method prototype, three kinds of error compensation models are proposed, and the solving method of the model parameters is given. The test results show that the error compensation model can effectively correct the magnetic flux measurement value and improve the accuracy of dipole magnetic moment measurement. When the fluctuation amplitude of the ambient magnetic field is less than 10nT, the measurement error of the dipole magnetic moment is less than 10% +/- 50mA . m(2). This error compensation method can be applied to the dynamic loop method magnetic moment measurement, and it can effectively improve the measurement accuracy.