磁矩进动阻尼引起相位滞后的实验测量和理论分析

Measurement and analysis of the pulsed magnetic field phase lag in the ceramic case

由于磁矩进动时阻尼作用的存在 ,脉冲磁场在金属材料中所产生的磁通量一般滞后于场 ,从而使穿过金属材料的脉冲磁场相位滞后 .对于非铁磁性金属材料 ,这种相位滞后非常微弱 ,而且由于趋肤效应和涡流的影响 ,阻尼作用导致的相位滞后难以观测 .给出了一种在有金属镀膜的陶瓷真空盒中测量这种相位滞后的实验方法及结果 .这种方法采用超薄、有绝缘条纹的隔离分区镀膜技术 ,在测量中适当选择测量点的位置 ,因而将趋肤效应和涡流的影响降低到最小 .

Due to the damping action during the magnetic moment precession,the magnetic flux generated by a pulsed magnetic field commonly will lag behind the field,so the phase of the pulsed magnetic field lags behind after it penetrates a coated metal. For the non-ferromagnetic metal,the phase-lag is very faint,and owing to the influence of conductor skin effect and eddy current,it can hardly be detected. An experimental method and the result obtained have been presented in this paper.In this method by using an ultra-thin coating with zonal stripe to isolate and select an appropriate position to measure,thus the influences of conductor skin effect and eddy current have been reduced to a minimum. An analysis has been presented in this paper.