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Infrared non-destructive evaluation (IRNDE) is an emerging approach for non-contact inspection of various solid materials such as metals, composites and semiconductors for industrial and research interest. This paper focuses on inspection of plain carbon steel materials, which are widely used, particularly in the power and steel industries. This paper describes some applications of recently proposed pulse compression based approach to the inspection of steel specimens. Present work highlights both phase and correlation based approaches for defect detection using frequency modulated thermal excitation scheme and comparison has been made on these proposed schemes.