Dr. Ghali V. Subbarao Profile

Dr. Ghali V. Subbarao

at PDPM IIITDM Jabalpur

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Author

Publications (8)

Proceedings Article | 30 June 2015 Paper

Testing and evaluation of concrete structures by thermal wave imaging

Ravibabu Mulaveesala, Juned Siddiqui, Vanita Arora, Geetika Dua, Ghali Subbarao, Amarnath Muniyappa

Proceedings Volume 9485, 94850G (2015) https://doi.org/10.1117/12.2176963

KEYWORDS: Corrosion, Thermography, Modulation, Nondestructive evaluation, Fourier transforms, Heat flux, Data analysis, Image filtering, Roads, Civil engineering

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Proceedings Article | 30 June 2015 Paper

A numerical approach for testing and evaluation of mild steel material by thermal wave imaging

Ravibabu Mulaveesala, Geetika Dua, Juned Siddiqui, Ghali Subbarao, Amarnath Muniyappa

Proceedings Volume 9485, 948510 (2015) https://doi.org/10.1117/12.2176962

KEYWORDS: Thermography, Defect detection, Nondestructive evaluation, Infrared radiation, Modulation, Finite element methods, Signal detection, Infrared imaging, Statistical modeling, Infrared detectors

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Proceedings Article | 30 June 2015 Paper

Signal and image processing techniques for testing and evaluation of glass fibre reinforced polymers

Ravibabu Mulaveesala, Vanita Arora, Juned Siddiqui, Subbarao Ghali, Amarnath Muniyappa

Proceedings Volume 9485, 94850W (2015) https://doi.org/10.1117/12.2176954

KEYWORDS: Thermography, Defect detection, Modulation, Fourier transforms, Polymers, Nondestructive evaluation, Glasses, Fiber reinforced polymers, Composites, Signal to noise ratio

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Glass Fibre Reinforced polymer (GFRP) composites are being used in a wide range of application areas since these materials are less affected by corrosive environmental conditions and provide longer life with less maintenance. However, there are still some concerns about reinforced polymers, such as the presence of surface and sub-surface defects which influence their in service applications. To detect these defects, InfraRed Thermographic (IRT) methods show their potential usage for Non-Destructive Testing and Evaluation (NDT&E) of composite materials due to their inherent testing capabilities such as remote, whole field, quantitative and qualitative to detect surface and sub-surface defects. Thermal NDT&E is broadly categorized into passive or active approach. In passive approach, the test sample's temperature distribution is monitored in the absence of any external heat stimulus at ambient conditions. However, this may not provide ample thermal contrast to detect the defects located at deeper depths. In order to detect deeper defects inside the test specimen, an active thermography is preferred. This can be carried out by applying an external heat stimulus, to induce enough thermal contrast over the test object. The thermal gradients appear over the material during the active heating due to the changes in thermal properties of defective and sound region leading to the detection of subsurface defects. This present work highlights a spectral reshaping by introducing a Gaussian window on the captured thermal profile in a frequency modulated thermal wave imaging and named as Gaussian Windowed Frequency Modulated Thermal Wave Imaging (GWFMTWI) technique. Further various multi-transform techniques (time and frequency domain based) have been introduced in order to test sub-surface defect detection capabilities in chosen GFRP sample. Comparison has been made with the non-stationary linear frequency modulated thermal wave imaging technique in terms of depth scanning capability. Results obtained from GWFMTWI clearly show better detection potential with improved test resolution and sensitivity.

Proceedings Article | 22 May 2013 Paper

Recent advances in thermal wave detection and ranging for non-destructive testing and evaluation of materials

Ravibabu Mulaveesala, V. Ghali, Vanita Arora, Juned Siddiqui, Amarnath Muniyappa, Masahiro Takei

Proceedings Volume 8705, 870510 (2013) https://doi.org/10.1117/12.2018465

KEYWORDS: Thermography, Nondestructive evaluation, Modulation, Ranging, Defect detection, Infrared radiation, Infrared imaging, Fermium, Frequency modulation, Ions

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Proceedings Article | 22 May 2013 Paper

Theory, modeling, and simulations for thermal wave detection and ranging

Ravibabu Mulaveesala, Subbarao Ghali, Vanita Arora, Juned Siddiqui, Amarnath Muniyappa, Masahiro Takei

Proceedings Volume 8705, 87050Z (2013) https://doi.org/10.1117/12.2018464

KEYWORDS: Thermography, Modulation, Signal to noise ratio, Nondestructive evaluation, Thermal modeling, Ranging, Heat flux, Modeling and simulation, Infrared imaging, Inspection

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Proceedings Article | 22 May 2013 Paper

Nondestructive testing and evaluation of composites by non-invasive IR Imaging techniques

Ravibabu Mulaveesala, Juned Siddiqui, Vanita Arora, S. Ghali, Amarnath Muniyappa, Masahiro Takei

Proceedings Volume 8705, 87050Y (2013) https://doi.org/10.1117/12.2018461

KEYWORDS: Nondestructive evaluation, Thermography, Defect detection, Signal to noise ratio, Composites, Infrared imaging, Inspection, Modulation, Fermium, Frequency modulation

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Proceedings Article | 18 May 2012 Paper

Matched excitation for thermal nondestructive testing of carbon fiber reinforced plastic materials

Ravibabu Mulaveesala, Ghali Venkata Subbarao, Muniyappa Amarnath

Proceedings Volume 8354, 835408 (2012) https://doi.org/10.1117/12.919986

KEYWORDS: Signal to noise ratio, Thermography, Carbon, Modulation, Nondestructive evaluation, Defect detection, Fourier transforms, Statistical analysis, Infrared imaging, Phase contrast

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Proceedings Article | 10 May 2011 Paper

Signal and image processing techniques for digitized frequency modulated thermal-wave imaging for characterization of fiber-reinforced plastics

Ravibabu Mulaveesala, Subbarao Ghali, Lokendra Balyan, Subir Lamba

Proceedings Volume 8013, 80130R (2011) https://doi.org/10.1117/12.882047

KEYWORDS: Thermography, Modulation, Signal to noise ratio, Defect detection, Fourier transforms, Image processing, Signal processing, Infrared cameras, Fiber characterization, Infrared radiation

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Showing 5 of 8 publications

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