Use of ThermoFit PRO dynamic thermal tomography in imaging control of multilayer products

In the present study, issues affecting the detection of internal defects, such as thin voids, adhesion failure and soldering / welding defects in multilayer construction materials, are considered. The approach involving thermal imaging control and data processing programs can be used to investigate materials including plastic and thin-film products, metallic multilayer products and carbon-fibre reinforced plastics. Results of applying the dynamic thermal tomography method to identify internal defects in both multilayer and homogeneous products are presented. The study assessed the use of the described method to detect thin internal defects in the form of voids and poor-quality gluing of layers in multilayer products. In the experiments, the FLIR E60 thermal imager and FLIR Tools software environment were used in conjunction with the ThermoFit Pro software program. Dynamic thermal tomography is acknowledged to provide for accurate evaluation of internal defect parameters. Maxigrams and timegrams used in thermal control applications are applicable in defectometry due to the dependence on the depth and thickness of the defects. In this case, a one-dimensional algorithm for determining defect parameters is used with the disregarded defect transverse dimensions. Thus, the algorithm is based on a combination of maxigrams and timegrams. During the study, the results of thermal imaging control are obtained in the form of an infrared image sequence. This sequence was processed in the ThermoFit Pro software for both timegram and maxigram construction. Based on the results obtained, the advantages and disadvantages of the studied method, as well as the software for thermal imaging control, were formulated. The method of dynamic thermal tomography is feasible for wide application in control of various material multilayer products of such sectors of industry as the aircraft engineering, as well as the manufacture and control of composite materials.

nondestructive control, thermal imaging control, temperature signal, dynamic thermal tomography, timegram, maxigram