【摘要】 针对电涡流传感器的线圈阻抗值计算问题,提出理论计算法和有限元法两种方法。以厚度为δ的被测体(含磁性和非磁性导体)上方正对一圆柱型线圈为求解模型,根据传感器工作原理和电磁场理论导出线圈阻抗积分表达式,并将其转化为更易求解的级数表达形式,由MathematicTM计算线圈阻抗值。然后根据有限元建模理论建立传感器的有限元模型,通过仿真得到传感器磁力线分布和线圈阻抗值。最后比较两种方法得到的阻抗值,结果表明两种方法计算结果相符,其有效性和正确性得到相互验证。更多还原

【Abstract】 To research the computational methods about the transducer coil impedance with the magnetic and non-magnetic measured target, two computational methods, theoretic method and finite element method, are proposed. The computational model of the coil impedance is simplified as a cylindrical coil over a cylindrical measured target with the thickness 8. According to the sensor measurement principal and the electromagnetic theory, the integral expression of the coil impedance is derived, which is expanded by series in polar coordinate system in order to compute easily and feasibly. And the coil impedance value is computed by Mathematic? Then, based on the modeling theory of finite element method, the finite element model is built. The coil impedance value and the magnetic distribution figures are obtained by finite element analysis, respectively. Finally, the results from the derivation and finite element analysis are in agreement very well by comparison, and they are given to validate the accuracy and feasibility of the derivation method with finite element method.更多还原