Wang Huan, Han Ziyi, Chen Yongjian, Li Shuyu, Li Haoran, Shen Hao, Xu Chunlong
School of Science, Chang'an University, Xi'an 710054, China.
School of Future Transportation, Chang'an University, Xi'an 710054, China.
Sensors (Basel). 2025 Sep 6;25(17):5566. doi: 10.3390/s25175566.
For the measurement of electrical conductivity of metal materials, the traditional contact measurement method has a limited test range and requires periodic electronic calibration. In order to overcome the above shortcomings, this paper takes the inductive response of an RLC circuit driven by alternating sources as the research object and proposes a non-contact method for conductivity measurement of non-ferromagnetic metals engaged by a single-layer solenoid sensor. The effect of the circuit parameters on the inductive sensor characteristics has been described with different resonant modes, and the electric conductivities of different metals can be theoretically calculated based on eddy current. Moreover, the Comsol Multiphysics software is used to conduct finite element analysis to compare the experimental results and the simulation, which is consistent with the theoretical analysis. The measured accuracy of the inductive sensor is verified to be higher than 91% in parallel resonance, which exhibits higher stability and precision than that of series mode. The implementation of this project will provide the theoretical basis and data reference for the detection of electromagnetic properties of unknown metals and has a wide range of applications in non-destructive testing, engineering construction detection, and other fields.
对于金属材料电导率的测量，传统的接触式测量方法测试范围有限，且需要定期进行电子校准。为克服上述缺点，本文以交流电源驱动的RLC电路的感应响应为研究对象，提出一种由单层螺线管传感器进行非铁磁性金属电导率测量的非接触式方法。利用不同的谐振模式描述了电路参数对感应传感器特性的影响，并基于涡流从理论上计算了不同金属的电导率。此外，使用Comsol Multiphysics软件进行有限元分析，以比较实验结果与模拟结果，二者与理论分析一致。经验证，感应传感器在并联谐振时的测量精度高于91%，其稳定性和精度高于串联模式。该项目的实施将为未知金属电磁特性检测提供理论依据和数据参考，在无损检测、工程建设检测等领域具有广泛应用。
