带干扰补偿的磁校准系统
Magnetic Calibration System With Interference Compensation
摘要：
本文介绍了一种新的方法，用于校准直流精密磁强计在低场范围（100 μ T），即使在实验室条件下具有显着的磁干扰，它给出了可接受的结果。通过引入紧密安装的参考磁力计和特定的校准程序，有可能补偿所引起的外部磁场干扰，例如，通过使用直流电源的本地运输。磁场补偿仅在校准线圈通电后不久发生。在这种情况下，线圈的磁通量由于时变补偿场的抵消而泄漏到参考传感器是可忽略的。当使用60 cm线圈和2.5 m距离的参考传感器时，我们能够计算出标准偏差为91 ppm的磁力计增益。我们表明，可以实现0.1%的总体不确定性。
英文摘要：
This paper describes a novel method for calibrating dc-precise magnetometers in the low field range (100 uT), which gives acceptable results even in laboratory conditions with significant magnetic interference. By introducing a closely mounted reference magnetometer and a specific calibration procedure, it is possible to compensate for the external magnetic field disturbances caused, e.g., by the local transportation operated with dc power supplies. The field compensation occurs only shortly after the calibrating coils are energized. In this case, the leakage of the coil's magnetic flux to the reference sensor due to the cancellation of the time-varying compensating field was negligible. When using 60 cm coils and reference sensor in 2.5 m distance, we were able to calculate magnetometer gains with a standard deviation of 91 ppm. We show that an overall uncertainty of 0.1% can be achieved.
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