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The paper describes investigations and research work in order to develop a simple sensor for the quantification of spectral broadband energy dissipation of flash lamps at any point in space. Such flash lamps are often used as energy source during active thermography testing (TT). Here, the temperature transient of the sensor surface has to be recorded by the infrared camera that is already present. During the following data evaluation, the energy input into the investigated specimen can be determined. Two opposite concepts were considered: thermal thick and thermal thin probes. The direct comparison shows advantages for thermal thick probes based on the physics of thermal balance processes.

Comparison of concepts for a point-shaped energy density detector after flash lamp excitation