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Neue Möglichkeiten zur Charakterisierung und Defekterkennung

Neue Möglichkeiten zur Charakterisierung und Defekterkennung in Dünnschichtsystemen und Kohlefaserverbundwerkstoffen mittels hochfrequenter Wirbelstromprüfung
Methods of characterising thin-film systems
: Klein, M.; Herzog, T.; Hillmann, S.; Schulze, M.; Larchenko, O.; Heuer, H.

Galvanotechnik 103 (2012), No.10, pp.2128-2143
ISSN: 0016-4232
Journal Article
Fraunhofer IZFP, Institutsteil Dresden ( IKTS-MD) ()

Many thin-films, simple and complex composite materials (e.g. carbon fiber composites) and layer systems (e.g. photovoltaic cells) can be characterized with the help of advanced eddy current testing technology as numerous quality parameters affect the local electrical conductivity. This paper presents measurement results gained with high-resolution eddy current spectroscopy and transmission eddy current testing at different layer systems. Detectable characteristics in thin-films and layer systems are sheet resistance, thickness, electrical conductivity, inhomogeneities or the depiction of structures. In many applications there are specific defects that are detectable with the underlying method. Presented examples from photovoltaics show finger failures, cracks, diffusion and deposition effects. Detectable effects in carbon fiber materials are missing fiber bundles, lanes, suspensions, missing sewing threads and angel errors in hidden layers.