Netzelmann, UdoUdoNetzelmannMüller, DavidDavidMüller2022-03-062022-03-062020https://publica.fraunhofer.de/handle/publica/26379810.1016/j.ndteint.2020.102325Two modified algorithms for pulsed phase thermography were defined. The principle is to mask out parts of the thermal signal that only add noise but contain no significant information. A first algorithm uses a frequency dependent Gaussian window function. A second algorithm leads to a rectangular window function. The algorithms were tested on synthetic signals modeling a circular hidden defect in a plate and experimentally by flash excited thermography on a steel and a polymer sample. For both materials, a significant improvement of the contrast-to-noise ratio from the defects was obtained for higher analysis frequencies.enpulsed thermographyPulse phase thermographynoise reductionContrast-to-noise ratio620658670journal article