For the purposes of research and the development of a calibration method using active infrared thermal imaging, a set of reference samples - tiles measuring 300x300 mm and ranging in thickness from 3 mm to 15 mm, made from various solid materials - was prepared. The examples are detailed in Table 1 and Figure 1:
Table 1 Benchmark reference materials
| Type | Thickness |
| PMMA | 10-15 mm |
| GFRP | 5-10 mm |
| CFRP | 5-10 mm |
| Stainless steel | 3-5 mm |
| Aluminium | 3-5 mm |
Fig.2. Plates of reference materials: PMMA, GFRP, CFRP, steel, aluminium
In addition to solid materials, composite specimens were prepared, with a multilayer structure, examples of materials are shown in Table 2 and Figure 2.
Table 2 Composite test materials
| Surface layer material | Material of honeycomb structure |
| Aluminium | Aluminium |
| Laminate (glossy black)/resin | Aluminium |
| Fibreglass (grey) | Aluminium |
| Plywood | Polypropylene |
| Carbon fibre (black) | Aramid |
Fig. 2. Samples made of composite materials (from left in order from Table 2.)
Each specimen was carefully dimensioned and characterised in terms of the parameters of the materials used, to ensure reproducibility.
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