In this paper an easy way to calibrate and adjust the output response of a multi-sensor probe for non-destructive testing on conductive material is proposed in order to perform the calibration, a simple coil is used, considered as a reference magnetic field generator thanking to a preliminary characterization carried out by using a simulation software. An FFT based algorithm was then used for probe adjustment. The calibration and adjustment apparatus can be easily integrated in the realized multi-sensor probe, so realizing a self-calibrating NDT instrument. The realized probe has then been tested on specimen with known cracks and the experimental results have been compared with the theoretical ones showing a very good agreement.
Calibration and adjustment of an eddy current based multi-sensor probe for non-destructive testing
BETTA, Giovanni;FERRIGNO, Luigi;LARACCA, Marco
2002
Abstract
In this paper an easy way to calibrate and adjust the output response of a multi-sensor probe for non-destructive testing on conductive material is proposed in order to perform the calibration, a simple coil is used, considered as a reference magnetic field generator thanking to a preliminary characterization carried out by using a simulation software. An FFT based algorithm was then used for probe adjustment. The calibration and adjustment apparatus can be easily integrated in the realized multi-sensor probe, so realizing a self-calibrating NDT instrument. The realized probe has then been tested on specimen with known cracks and the experimental results have been compared with the theoretical ones showing a very good agreement.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
