根据巴克豪森效应, 铁磁性材料在外部交变磁场的影响下会产生周期性的噪声信号。采用该种基于巴克豪森效应的检测方法, 通过检测在同等试验条件下不同硬度45钢试件接收到的巴克豪森信号, 分析了信号各特征值与试件硬度的关系。试验结果表明: 巴克豪森信号与硬度具有较高的相关性, 巴克豪森法可用于检测铁磁性材料表面硬度。

This paper proposes a new method to detect hardness of ferromagnetic materials based on the Barkhausen effect. According to Barkhausen effect, ferromagnetic material would produce periodic noise signal under the external alternating magnetic field. Through the detection of the Barkhausen signal of different hardness 45 steel test pieces under the same experimental conditions, the characteristic value of the signal and its relationship with the hardness were analyzed. Test results show that Barkhausen signal and hardness are of high correlation, and the detecting surface hardness of ferromagnetic material by Barkhausen method should be feasible.