Tilt Effects in Pulsed Eddy Current Measurements

Pulsed eddy current (PEC) testing has been widely used in wall-thinning and corrosion detection in conductive materials due to its advantages of deep penetration depth, low power consumption and so on. However, the tilt effect on its performance has not been investigated. A tilted PEC probe can lead to signal distortion, resulting in errors in measurements and evaluations. For the first time, this paper combines the theory of mutual impedance variation of tilted coils with PEC testing, thereby obtaining analytical solutions for tilted PEC sensors. Based on the analytical solutions, the impact of different tilt angles on the PEC signal of transient voltage change has been obtained and analysed. Furthermore, corresponding experiments have been conducted, which not only confirm the numerical results of tilt effects but also validate the accuracy of the analytical solutions.