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arXiv 1409.7267physics.ins-detquant-ph
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低频搜索线圈磁强计的降噪和SNR增强研究

Investigation of Noise Reduction and SNR Enhancement in Search Coil Magnetometers at Low Frequencies

Abolghasem Nourmohammadi, Seyed Mohammad Hassan Feiz, Mohammad Hassan Asteraki

摘要:

在这里,一个广义的感应圈传感器模型,比其他模型更一般化,已被认为是和线圈的热噪声的等效磁场和传感器的信噪比的理论计算的基础上的线圈绕组和它的核心的尺寸和几何形状。我们的计算表明,热噪声的等效磁场可以通过线圈与磁芯的重量比最小化。此外,还发现只有当芯体长径比取某一特定值时,传感器的信噪比才能达到最大。计算结果与实验测量的噪声数据吻合较好。

英文摘要:

Here, a generalized induction coil sensor model, more generalized than other models, has been considered and the equivalent magnetic field of the coil thermal noise and the sensor signal to noise ratio are calculated theoretically based on the dimensions and geometry of the coil winding and its core. Our calculations indicate that the equivalent magnetic field of the thermal noise can be minimized by the coil to core weight ratio. Moreover, it is found that the sensor signal to noise ratio can be maximized with only a special value of core aspect ratio length to diameter of core ratio. The calculation results here exhibit good agreement with the experimentally measured noise data.

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