Open AccessPulse compression favorable frequency modulated thermal wave imaging for non-destructive testing and evaluation: an analytical study
Author(s) -
Anju Rani,
Ravibabu Mulaveesala
Publication year - 2021
Publication title -
iop scinotes
Language(s) - English
Resource type - Journals
ISSN - 2633-1357
DOI - 10.1088/2633-1357/ac049a
Subject(s) - thermography , nondestructive testing , materials science , acoustics , sensitivity (control systems) , adiabatic process , pulse compression , thermal , optics , finite element method , infrared , electronic engineering , structural engineering , computer science , engineering , physics , radar , telecommunications , quantum mechanics , meteorology , thermodynamics
InfraRed Thermography (IRT) is one of the non-destructive testing and evaluation (NDT&E) approach widely used for testing and evaluation of wide verity of materials such as metals, semiconductors and composites. Among the widely used Thermal NDT&E (TNDT&E) approaches for better depth resolution and sensitivity for detection of defects located at different depths inside the test specimen recently proposed correlation based approach gained importance due to its enhanced defect detection capabilities. The present paper introduces a novel one-dimensional analytical solution for the frequency modulated excitation scheme under adiabatic boundary conditions for detection of flat bottom holes as defects in a mild steel sample. The performance of the Pulse Thermography (PT), Lock-in Thermography (LT) and Frequency Modulated Thermal Wave Imaging (FMTWI) methods are highlighted their defect detection capabilities have been compared by adopting the recently introduced correlation based post-processing approach. Finally, the proposed analytical method has been validated with the results obtained from the commercially available finite element based software.