Transient Eddy-Current Nondestructive Evaluation: Benchmark Data for Backface Slots in a Plate

The results of a benchmark experiment for transient eddy-current nondestructive evaluation are reported. The benchmark configuration corresponds to the canonical geometry of an air-cored probe coil positioned above a conductive plate containing a long back-face slot. The coil is excited by an exponentially-damped step function current and measurements are made of the change in the transient magnetic field due to the slot. The aim of the work is to provide experimental data for validation of theoretical models under development within the wider NDE community and to provide a common geometry against which the performance of a range of such models can be compared. A further aim of the work is to stimulate the ongoing development of quantitative methods in transient eddy-current research. RELEASE LIMITATION Approved for public release