School of Life Sciences, Tiangong University, 399 Binshui West Street, Xiqing District, Tianjin 300387, People's Republic of China.
School of Artificial Intelligence, Tiangong University, 399 Binshui West Street, Xiqing District, Tianjin 300387, People's Republic of China.
Rev Sci Instrum. 2022 Sep 1;93(9):094102. doi: 10.1063/5.0075990.
Micro-magnetic stimulation is a research hotspot in the field of neuromodulation. However, it is difficult to measure the weak magnetic field produced by a millimeter-sized inductor. In this study, a mutual inductance model considering different positions and sizes was established for a common planar square spiral coil micro-magnetic stimulator. A physical model was simulated using the Comsol finite element method to verify the accuracy of the mutual inductance model. A weak magnetic field detection system was constructed using the TI AD8130 and NE5532 chips, and the magnetic field strengths of excitation micro-coils sized 3.612 × 3.612 and 5.55 × 5.55 mm were measured. The results show that when the size ratio of the detection coil (DC) to the excitation coil (EC) is under a specific ratio (DC:EC = 1:1, 2:1, 1.53:1,2.36:1), the measurement range of the magnetic field strength is in the range 0-3.06 mT with an error of 0.05 mT, and the frequency is in the range 1-120 kHz. The measurement accuracy rate reaches 97.62%. The results of this study have potential application in the measurement of the weak magnetic field.
微磁刺激是神经调控领域的研究热点。然而，毫米级电感产生的弱磁场很难测量。本研究针对常见的平面方形螺旋线圈微磁刺激器，建立了考虑不同位置和尺寸的互感模型。利用 Comsol 有限元方法对物理模型进行了模拟，验证了互感模型的准确性。使用 TI AD8130 和 NE5532 芯片构建了一个弱磁场检测系统，并测量了尺寸为 3.612×3.612 和 5.55×5.55mm 的激励微线圈的磁场强度。结果表明，当检测线圈（DC）与激励线圈（EC）的尺寸比（DC:EC=1:1、2:1、1.53:1、2.36:1）在特定范围内时，磁场强度的测量范围为 0-3.06mT，误差为 0.05mT，频率范围为 1-120kHz。测量精度率达到 97.62%。本研究结果在弱磁场测量方面具有潜在的应用价值。
