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Starting with some examples from the VITCEA project, which gives the framework of the training course, the physical basis of active thermography is demonstrated. It consists of the physical phenomena heat conduction and thermal radiation. The contrast mechanism is explained by means of a simple 1-dimensional approach. This leads to the concept of thermal thickness which is essential for active thermography. Later, the influence of the surface properties reflectivity and emissivity is considered more in detail.
The permanently increasing number of wind turbines requires suited inspection and monitoring methods to ensure liability and security. Concerning the inspection of ro-tor blades, only manual inspections are state of the art. Thermographic Testing (TT) has the potential to detect typical failures and damages on rotor blades. The presentation demopnstrates the measurement principle and some results of onsite measurements carried out as “passive thermogra-phy”, i.e. without a defined heating procedure. Due the totally contactless meas-urement principle, TT can be applied to rotating blades as well as to resting blades. Both methods will be compared with respect to their possible realization.