磁通门传感器探头温度特性研究

Study on Temperature Characteristic of Fluxgate Sensor Detectors

磁通门传感器主要由磁探头与电路部分组成,其输出不仅随磁场变化,而且易受温度的影响。为了确定磁通门传感器磁探头在宽温度范围下的温度漂移情况,通过试验将探头置于-40℃~150℃的温度环境下,记录得到探头在宽温度范围下,其温度特性曲线近似为正比线性关系。分析认为,磁芯磁滞回线受热偏移与线圈漆包线随温度热胀冷缩是磁探头温漂的主要原因。本文提出选用低磁导率磁芯和高温漆包线绕制探头,并优选一致性较好的探头,采用最小二乘法对温度漂移结果进行拟合补偿,有效地消除了温度对磁探头的影响,提高了磁通门传感器的温度稳定性与应用的广泛性。

Fluxgate sensor is mainly composed of detectors and circuits. Its output is changing both with the magnetic field and the environment temperature. In order to determine the temperature drift of the fluxgate sensor detectors in a wide temperature range,this paper has recorded the output curves of the magnetic sensor detectors with the tempera-ture changing from -40℃ to 150℃. The curve is approximate linearity and the output is in direct proportion to the temperature. The drift is caused by the changing of the enamelled wire and the magnetic hysteresis loop. It compen-sates the temperature drifts with the method of least squares,which effectively eliminates the influence of temperature on the sensor detectors. The fluxgate sensor will be much more steady and universal with this study.