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NDT.net Issue - 2017-06 - Articles
NDT.net Issue: 2017-06
Publication: Indian National Seminar & Exhibition on Non-Destructive Evaluation NDE 2016, Dec, Thiruvananthapuram (NDE-India 2016)
ARTICLE

Frequency and Time Domain Data Analysis Approaches for Detection and Evaluation of Subsurface Defects using Active Thermography

Javed Ahmad1, Aparna Akula14, Ripul Ghosh13, Satish Kumar13, H.K. Sardana1, Ravibabu Mulaveesala24
1CSIR-CSIO-Central Scientific Instruments Organisation5, Chandigarh, India
2InfraRed Imaging Laboratory; Indian Institute of Technology Ropar (IIT)8, Punjab, India

Abstract: Non-destructive Testing and Evaluation (NDT&E) techniques are widely used for inspection of a variety of materials, structures and components. Among all NDT&E techniques, infrared thermography is widely accepted by testing and evaluation community due to its non-contact, whole-field and fast monitoring capabilities. The experimental and theoretical aspects of frequency modulated thermal wave imaging (FMTWI) is discussed. FMTWI is used for inspection of a mild steel specimen with artificially simulated circular defects of equal diameters but located at various depths. The acquired data has been analyzed in the frequency domain using Fourier transform and in time domain using pulse compression approach to visualize the defects and a comparative qualitative analysis has been carried out among these processing techniques. It was observed that, pulse compression approach significantly improves the defect’s visualization with improved signal to noise ratio (SNR). Further, quantitative information regarding the depth has also been determined using the Fourier approach. Key words: Active infrared thermography, Frequency modulated thermal wave imaging, Pulse compression, Fast Fourier transform, Non-destructive thermography. 1


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