Design of eddy current testing system for metal conductivity based on TMR sensor

Jiaqing Chen; Minghui Hu

doi:10.1117/12.2678912

15 May 2023 Design of eddy current testing system for metal conductivity based on TMR sensor

Jiaqing Chen, Minghui Hu

Proceedings Volume 12699, Third International Conference on Sensors and Information Technology (ICSI 2023); 1269908 (2023) https://doi.org/10.1117/12.2678912
Event: International Conference on Sensors and Information Technology (ICSI 2023), 2023, Xiamen, China

Abstract

A set of metal conductivity eddy current detection system is designed by using tunnel magnetoresistance (TMR) sensor and quadrature demodulation principle. The system uses one coil for excitation and dual TMR for receiving the magnetic field strength signals to differentiate. Through the finite element simulation, it is found that the logarithm of the phase of the difference between the magnetic field strengths at two points on the coil axis has a linear relationship with the logarithmic value of the metal conductivity. Therefore, in order to obtain the phase of the magnetic field, a quadrature demodulation system based on LabView is designed. The relative error of demodulation of magnetic field amplitude and phase of the system is within 1%. By measuring the electrical conductivity of the metal test blocks, we found that the experimental results are in good agreement with the simulation, and the relative errors of the conductivity are within 4%, which proves the feasibility of the system on detecting non-ferromagnetic materials.

Citation Download Citation

Jiaqing Chen and Minghui Hu "Design of eddy current testing system for metal conductivity based on TMR sensor", Proc. SPIE 12699, Third International Conference on Sensors and Information Technology (ICSI 2023), 1269908 (15 May 2023); https://doi.org/10.1117/12.2678912

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