CC BY 4.0Klein, SamuelSamuelKleinHeib, TobiasTobiasHeibHerrmann, Hans-GeorgHans-GeorgHerrmann2022-03-0618.8.20212021https://publica.fraunhofer.de/handle/publica/26890910.3390/app1116745610.24406/publica-r-268909This work investigates solar loading thermography applications using active thermography algorithms. It is shown that active thermography methods, such as step-heating thermography, present good correlation with a solar loading setup. Solar loading thermography is an approach that has recently gained scientific attention and is advantageous because it is particularly easy to set up and can measure large-scale objects, as the sun is the primary heat source. This work also introduces the concept of using a pyranometer as a reference for the evaluation algorithms by providing a direct solar irradiance measurement. Furthermore, a recently introduced method of estimating thermal effusivity is evaluated on ambient-derived thermograms.ensolar loading thermographystep-heating thermographyactive thermographythermal effusivitylinear effusivity fitinfrastructureNDT620658670journal article