The main purpose of paper is presented an innovative approach in the field of infrared thermal imaging and its integration into the area of engineering applications. As the test specimen was selected composite rod with lengthwise composite fibers to each bonded. They have been excitated with ultrasound. For obtain the results was used Lock-in method. Last part of the paper is a description of the results and most appropriate settings of measurement technique for applications with chosen material.

Acknowledgement: This work was supported by the project KEGA 017ŽU-4/2017.