基于带电直导线周围磁场的磁传感器动静态特性标定方法

目前磁传感器多用于对静态或准静态磁场环境的测试,当被测磁场矢量快速变化时,磁传感器的动态特性成为影响其测量精度的关键因素。针对测试现场环境中难于产生标准的高频交变激励磁场源致使磁传感器动态特性无法准确快速标定的难题,提出一种基于带电直导线周围磁场的磁传感器动静态特性现场快速标定方法。首先提出并构建了一种基于带电直导线的标准宽频带磁场发生器,采用毕奥-萨伐尔定律分析了带电直导线周围磁场分布规律;其次通过在长直导线中加载典型交变激励电流,产生典型交变磁场,采用系统辨识方法实现对磁传感器动态特性标定;最后对某矢量磁传感器测量系统进行了时域、频域动态模型标定。实验表明所提出的磁传感器动态模型标定方法具有简便、快速、高效、准确的优点,便于工业现场对各类磁传感器进行动静态特性标定。

Calibration method based on the magnetic field around the wire electric straight static and dynamic properties of magnetic sensors

Currently magnetic sensors used for static or quasi-static magnetic field of environmental measuring, when rapid changes in the measured magnetic field vector, the dynamic characteristics of the magnetic sensor is a key factor affecting the measurement accuracy. For the test site environment is difficult to generate a standard high-frequency alternating magnetic field excitation source causing the dynamic characteristics of the magnetic sensor calibration problem can not be quickly and accurately, this paper presents a magnetic sensor based on the magnetic field around a straight wire electrified static and dynamic characteristics of rapid field calibration method. The article first proposed and constructed a standards based wideband charged straight wire magnetic field generator, using the Biot-Savart law analysis of the distribution of the magnetic field around a charged straight wire; followed by loading the typical alternating excitation current in long straight wire, typical alternating magnetic field was produced. The dynamic characteristics of the magnetic sensor was calibrated by using system identification methods; Finally, a vector magnetic sensor measurement system in time domain, frequency domain dynamic model calibration. Experimental results show that the proposed dynamic model of the magnetic sensor calibration method is simple, rapid, efficient and accurate advantages of various types of industrial site to facilitate static and dynamic characteristics of the magnetic sensor calibration.