Develop algorithms to improve detectability of defects in Sonic IR imaging NDE

Ultrasonically stimulated thermography for crack detection of turbine blades

“…Vibrothermography successfully demonstrated the viscoelastic temperature increase due to the delamination of composites [6,7], while Solodov et al utilised Chladni figures to demonstrate and visually illustrate resonance defects [8]. Gao et al used statistical methods to detect cracks in turbine blades using sonic IR [9], and Obeidat et al developed algorithms for post-processing to better extract damages [10][11][12]. The effect on the temperature of a closing crack was studied by Lu et al [13], and the energy and heat index was developed for crack classification [14][15][16] based on the dissipated energy in the crack.…”

A novel thermosonic imaging system for non-destructive testing

“…One such source of temperature rise is due to the heating that occurs near the point of contact between the test piece and the transducer tip [11]. In the case of the experimental setup used in this study, this could be due to friction occurring between the support bracket and the surface of the test piece as well.…”