磁巴克豪森噪声信号检测传感器的设计

针对铁磁性材料设计一种获取磁巴克豪森噪声信号的检测传感器.通过有限元电磁仿真软件Ansoft对励磁常用的H型和U型励磁模块进行仿真分析,分析对特定试件的磁化效果,并根据磁化效果及制作难度,最终选定H型磁轭作为励磁模块.理论计算结合实验现象,分析影响磁巴克豪森噪声信号检测传感器性能的因素,得出结论:磁场在垂直于材料表面传播会出现衰减,并且与线圈激励信号频率成反比,可通过调节信号的频率来实现磁化深度的调节,信号的幅值会影响试件的磁化强度;接收线圈的灵敏度与磁芯的长度、直径及缠绕线圈的匝数成正比,但还需考虑缠绕线圈的分布电容、有效电阻及接收线圈的大小等因素.最终,设计的检测传感器可获得具有较好信噪比的磁巴克豪森噪声信号.

Design of Magnetic Barkhausen Noise Signal Detection Sensor

A kind of detection sensor is designed for ferromagnetic materials to obtain Barkhausen noise signal.Through the finite element electromagnetic simulation software Ansoft, the common H-type and U-type excitation modules are simulated and analyzed, and the magnetization effect of specific test pieces is analyzed. According to the magnetization effect and manufacturing difficulty, the H-type yoke is selected as the excitation module finally. Theoretical calculation and experimental phenomena are combined to analyze the factors that affect the performance of the Magnetic Barkhausen noise signal detection sensor. It is concluded that the magnetic field will attenuate when it propagates perpendicular to the surface of the material and is inversely proportional to the frequency of the coil excitation signal. The adjustment of the magnetization depth can be realized by adjusting the frequency of the signal, and the amplitude of the signal will affect the magnetization strength of the test piece; the flexibility of the receiving coil The sensitivity is directly proportional to the length and diameter of the core and the number of turns of the winding coil, but the distributed capacitance, effective resistance of the winding coil and the size of the receiving coil should also be considered. Finally, the designed sensor can obtain the Magnetic Barkhausen noise signal with better signal-to-noise ratio.