Stefan Breitwieser

Fachhochschule Oberösterreich | fh-ooe · Josef Ressel Center for Thermal NDE of Composites

We combine three different approaches to greatly enhance the defect reconstruction ability of active thermographic testing. As experimental approach, laser-based structured illumination is performed in a step-wise manner. As an intermediate signal processing step, the virtual wave concept is used in order to effectively convert the notoriously diff...

Noise plays a fundamental role in connection with theoretical limits in the field of inverse thermal problems, since the solution accuracy for such inverse problems is decisively influenced by noise-induced errors in temperature measurements. There are eight standard assumptions proposed by Beck and Özisik [1], [2], [3], [4] for the statistical des...

This work presents the possibility of using infrared (IR) thermography as a fast, contactless and therefore nondestructive inspection method to detect failures in commercial thermoelectric (TE) modules. For this the TE modules were thermally excited by internal Joule heating. The temperature at the hot side of the TE module was recorded with an IR...

In this work we present a method to detect failures in commercial thermoelectric (TE) modules using Infrared (IR) thermography. The TE modules consist of 252 pn thermoelectric junctions based on Bi2Te3 alloys. The dimension of a TE module is 40 mm x 40 mm x 4,7 mm. In general, failures which are located inside the TE module (typically cracks, physi...