USING OF ACTIV THERMOGRAPHY AND LOCK-IN METHOD WITH ULTRASOUND EXICATION FOR DETECTION OF MATERIAL DEFECTS

Summary. 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. Test specimens with different shapes have been chosen from steel material and 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.