2. Theory
For the interpretation of the test results, a short introduction into the functionality of IrT is provided.
2.1. Infrared thermography
In the present examination, passive IrT and supplementarily also optical LT are applied to monitor the damage behaviour of mechanically loaded crack patched specimens. A sketch of the test setup of IrT can be found in Fig. 1. On the right hand side the loaded specimen is depicted which sends varying infrared radiation due to varying loading.