The application of active IR imaging has been tested for electronic foil sensors consisting of printed conducting lines, by using electrical heating as source of excitation. Local non-homogeneities have successfully been detected, which are due to failures in the production process or induced by mechanical tests simulating normal mechanical aging and wear processes. The design of such foil sensors can also be improved by mechanical tests and simultaneous or subsequent active IR imaging. The present study which only relies on empirical tests and the qualitative discussion of the IR images has given reliable and sufficient information to implement such tests under the conditions of industrial production. For an improved quantitative analysis, which may be useful for sensor design studies, a complete theoretical study may be necessary, taking into account the convolution effects induced by the limited lateral resolution of the detector and the effects of 3-D heat propagation.
Detection of defects of foil sensors applied in the automotive industry by means of active ir thermography
2003
6 Seiten, 8 Bilder, 4 Quellen
Conference paper
English
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