OF CARBON STEEL PLATES USING PULSED EDDY CURRENTS V.O. de Haan and P. de Jong 1 BonPhysics Research and Investigations BV, Putterhoek, The Netherlands; 2 Röntgen Technische Dienst bv, Rotterdam, The Netherlands Abstract: It is well know from literature that Pulsed Eddy Currents generated by switching off a stationary current through a coil above a carbon steel plate can be used to measure the t...

Standard Pulsed Eddy Current Systems, as RTD-INCOTEST© equipment, use receiver coils to measure eddy current decay in conducting objects. Advantages of full coils, as sensor for the eddy current, are its simple construction and the possibility of eddy current focussing. But, some disadvantages are the high induction voltage due to a large pulsed signal, the large sensor area and the low coil’s ...

In contrast to single frequency conventional eddy current technique (ECT), in pulse ECT the coil is excited by repetitive broadband pulse. The pulsed excitation contains wide spectrum of frequencies. Each frequency has different penetrability and hence using pulsed eddy current (PEC) technique, large areas of structure with multiple variations in thickness can be scanned without the need for pa...

Conventional eddy current using single-frequency excitation has limited material characterization capabilities. Enrichment of the spectral information of the signal with techniques such as multifrequency or swept frequency inspection could be employed to improve the inspection process. Broadband excitation is also implemented with time-domain inspection using pulsed eddy current PEC. The spectr...