Pulsed eddy current non-destructive evaluation based on coupled electromagnetic quantities method

Pulsed Eddy Current NDE of Groove Dimensions by Inversion With Simplex Method Associated With Coupled Electric Circuits Method

“…1(b)]. The crossing times by zeros (T Z1 and T Z2 ) and by the maximums (T 1 , T 2 , and T 3 ), the first, second, and third peak voltage variation (AMP1, AMP2, and AMP3) and the ratio between the amplitudes (RMM1 and RMM2) can be used to NDE of electrical and geometrical properties [3], [12]. RMM1 and RMM2, respectively, represent the ratio between the second peak amplitude over the first and the ratio between the third peak amplitude over the second.…”

“…3). The absolute sensor of pancake type is excited by a half-sinusoidal current feed [12]. To control and evaluate the state and the pièce properties, the depth and width of an annular groove in aluminum piece are studied according to the evaluation parameters.…”

“…In this context, we propose the development of a simplex inversion method associated with a semianalytical direct model, in axisymmetric case. The semianalytical formulation is developed from coupled electric circuits modeling (CECM) [9] in which the Crank Nicholson formula is used to derive the transient behavior [3], [10]- [12]. It uses a square or half-sinusoidal wave current excitation allowing the determination of the sensor voltage.…”

“…It uses a square or half-sinusoidal wave current excitation allowing the determination of the sensor voltage. The feature of the variation of the voltage provides information on the electromagnetic and geometrical properties of the device [12]. The transient sensor voltage is then calculated, allowing the evaluation of the dimensions of an annular groove in the considered work piece.…”

“…The application concerns a device with absolute sensor excited by a half-sinusoidal current [12]. Manuscript …”