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Processing of results from a thermal FEM analysis using the lock-in method and comparison with experiment

Štalmach Ondrej, Dekýš Vladimír, Novák Pavol, Sapieta Milan

Zeszyty Naukowe. Transport / Politechnika Śląska

2019

z. 104

159--168

This article dealt with the comparison of results obtained from an experiment and from the numerical thermal FEM analysis. Sample with defects were printed on a 3D printer. A thermal wave from the halogen lamp to excite the front surface of the sample was used in the next step and the response was measured by a thermal camera. After processing the data in the software DisplayIMG, a phase image was created representing the 2D image of the material at a certain depth under the surface of the model. Lock-in method was applied to the results from the numerical thermal FEM analysis and the phase image was created. The programs code were created in MATLAB for a 4 points, multiple points and differential lock-in method which were compared with the results from the experiment.