用于磁探测的铁磁屏蔽体的厚度设计

摘要

针对高精度磁探条件下铁磁屏蔽体的厚度设计问题,推导了屏蔽壳体感应磁矩计算公式,并定义了最佳厚度,提出最佳厚度模型,设计了验证实验.实验结果表明:当屏蔽体厚度增加时,屏蔽体内磁源的漏磁减小,但屏蔽体自身的附加干扰场将增大,且漏磁减小的斜率逐渐减小,而干扰场增加的斜率逐渐增大.实验结果也验证了提出的最佳厚度模型.%The formula of inductive magnetic-moment of the ferromagnetic shield was derived for the thickness design of shield used for high-precision magnetic detection. And then the best-thickness of the shield was defined to establish the best-thickness model which is verified by an elaborated experiment. The results show that the magnetic leakage of the magnetic source in the shield decreases with the increase in the thickness which leads to the additional interference. The slope of magnetic leakage decreases , meanwhile the slope of the additional interference increases. The best-thickness model was validated by using the experimental results.