The drive to probe deeper into thick-section, multi-layer aircraft structures has resulted in the application of transient (or pulsed) eddy-current technology to certain inspections that would be time-consuming or unreliable using conventional methods. This is an emerging technology and, whilst commercial systems are already available, there is still considerable on-going development of improved analysis methods. This paper presents the new imaging capabilities that have been added recently to QinetiQ's TRECSCAN package. These include a technique for determining the through-thickness location, severity and lateral extent of corroded metal-loss in a multi-layer structure, even in the situation where two regions are superimposed. For crack detection in complex structures, new analysis methods allow the compression of the wide dynamic range required to simultaneously view cracks in structures of widely different thickness on the same image. Also included are examples of using differential scanning probes and image-processing methods that aid interpretation of the resultant scans. Absolute metal loss can be measured and through-thickness location of cracks and corrosion can be determined using a calibration curve for Time-to-Peak measurements. The more complex and elusive problem of distinguishing superimposed defects is being addressed and can be solved using transient eddy currents.
Advances in transient eddy-current imaging for aerospace applications
Fortschritte bei der transienten Wirbelstrom-Abbildung für Raumfahrtanwendungen
2004
8 Seiten, 9 Bilder, 16 Quellen
(Nicht paginiert)
Conference paper
Storage medium
English
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