论文部分内容阅读
针对铁氧体磁芯对电涡流传感器线圈阻抗的影响问题,建立了含铁氧体磁芯的线圈阻抗理论模型,推导了单匝线圈阻抗的级数和矩阵形式,并通过积分获得圆柱线圈的阻抗表达式。因表达式参数多且计算复杂,用有限元法对含Ni-Zn铁氧体磁芯的线圈阻抗进行数值计算,并分析了铁氧体磁芯及其几何参数对传感器性能的影响。研究表明:通过理论模型和有限元法都可获得线圈阻抗值,但后者求解更加简便;铁氧体磁芯可将磁场限定在一定范围之内,提高了传感器的灵敏度;磁芯参数对传感器性能的影响因被测体材料而异。本文的研究可为传感器探头结构优化和性能改善提供理论依据。
Aimed at the influence of ferrite core on the impedance of the eddy current sensor coil, a theoretical model of the coil impedance of the ferrite core is established. The order and matrix form of the impedance of the single-turn coil are deduced. Impedance expression. Due to the large number of parameters and the complicated calculation, the coil impedance of Ni-Zn ferrite core with Ni-Zn ferrite core is numerically calculated by finite element method. The influence of ferrite core and its geometric parameters on the sensor performance is also analyzed. The results show that the impedance of the coil can be obtained by the theoretical model and the finite element method, but the latter is easier to solve. The ferrite core can limit the magnetic field within a certain range and improve the sensitivity of the sensor. The impact of performance varies with the material being tested. The research in this paper can provide a theoretical basis for structural optimization and performance improvement of the sensor probe.