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Beat Interferences in Fundamental Mode Orthogonal Fluxgates

机译：消除基本模式正交通量中的干扰

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摘要

Fundamental mode orthogonal fluxgates (FM-OFGs) can be made very thin so that one can assemble them in an array to image magnetic field distributions. The dc-biased ac excitation current is fed to the U-shaped wire core of the sensor head; therefore, one can enclose the area by the excitation of the current path, which is made small. Due to the high sensitivity of FM-OFG, tiny but substantial (several hundreds pT) sinusoidal oscillations are visible in the output when two FM-OFGs are placed close to one another. The frequencies of such oscillations are found to be exactly the difference of two ac excitation frequencies independently operated upon the sensor head and higher harmonics of the difference frequency. The interference can be described as a beat of the excitation magnetic fields. We will show that interferences are mainly caused by the inductive coupling of the excitation magnetic field and that, although interferences decay quickly in intensity with increased distance between the sensor heads, they remain at the level of several hundreds pT at 5.8 cm apart. A solution to the problem is to use the same excitation frequency for all the sensor heads, which will suppress beat interferences where they are converted to tiny dc components.
机译：基本模式正交磁通门（FM-OFG）可以做得很薄，这样就可以将它们组装成阵列以成像磁场分布。直流偏置的交流激励电流被馈送到传感器头的U形线芯。因此，可以通过激励电流路径来封闭该区域，该电流路径被减小。由于FM-OFG的高灵敏度，当两个FM-OFG彼此靠近放置时，在输出中会看到微小但实质性的（几百pT）正弦振荡。发现这种振荡的频率恰好是在传感器头上独立操作的两个交流激励频率的差和该差频率的高次谐波。干扰可以描述为激励磁场的拍频。我们将证明干扰主要是由激励磁场的感应耦合引起的，尽管干扰的强度随着传感器头之间距离的增加而迅速衰减，但它们在5.8 cm处仍保持数百pT的水平。解决该问题的方法是对所有传感器头使用相同的激励频率，这将抑制拍频干扰，将其转换为微小的直流分量。

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