Vol. 20 No. 1 (2023): Journal of Non Destructive Testing and Evaluation (JNDE), March 2023
Research Papers

Defect Detection Capabilities of Barker-Coded Thermal Wave Imaging in Titanium Alloy (Ti-6AL-4V)

Anshul Sharma
InfraRed Imaging Laboratory (IRIL) Laboratory, Centre for Sensors, Instrumentation and cyber-physical Systems Engineering (SeNSE), Indian Institute of Technology Delhi, Hauz Khas, New Delhi
Vanita Arora
Indian Institute of Information Technology Una, Vill. Saloh, Teh. Haroli, Distt. Una Himachal Pradesh, India-177209
Ishant Singh
InfraRed Imaging Laboratory (IRIL) Laboratory, Centre for Sensors, Instrumentation and cyber-physical Systems Engineering (SeNSE), Indian Institute of Technology Delhi, Hauz Khas, New Delhi
Priyanka Das
InfraRed Imaging Laboratory (IRIL) Laboratory, Centre for Sensors, Instrumentation and cyber-physical Systems Engineering (SeNSE), Indian Institute of Technology Delhi, Hauz Khas, New Delhi
Ravibabu Mulaveesala
InfraRed Imaging Laboratory (IRIL) Laboratory, Centre for Sensors, Instrumentation and cyber-physical Systems Engineering (SeNSE), Indian Institute of Technology Delhi, Hauz Khas, New Delhi

Published 12-03-2023

Keywords

  • Barker-Coded Thermal Wave Imaging (BCTWI),
  • Pulse compression,
  • Titanium alloy (Ti-6Al-4V),
  • signal-to-noise ratio,
  • correlation coefficient

How to Cite

Sharma, A., Arora, V., Singh, I., Das, P., & Mulaveesala, R. (2023). Defect Detection Capabilities of Barker-Coded Thermal Wave Imaging in Titanium Alloy (Ti-6AL-4V). Journal of Non-Destructive Testing and Evaluation (JNDE), 20(1), 44–52. Retrieved from https://jnde.isnt.in/index.php/JNDE/article/view/30

Abstract

Pulse compression favorable active infrared thermographic techniques have emerged as highly promising evaluation methodologies among various thermal non-destructive testing and imaging modalities for identifying subsurface anomalies in the test specimen. Because they outperform commonly utilized pulse and periodically modulation-based conventional thermal wave imaging modalities regarding defect detection sensitivity and resolution while employing low peak power heat sources and a comparatively moderate amount of experimenting time. Recently proposed Barker-Coded Thermal Wave Imaging (BCTWI) has offered these advantages over other infrared thermographic techniques. Several data processing methodologies are also be developing to characterize the anomalies from the depicted thermal data. This study highly recommends pulse compression-based data processing approaches for the Barker-coded thermal wave imaging technique. This is because it enhances the localization of supplied thermal energy into the main lobe of cross-correlation data and dispenses significantly less energy into the sidelobes. Current study focused on the application of BCTWI modality with time domain-based and frequency domain data processing approaches such as time domain correlation, time domain phase and frequency domain phase analysis for defect detection in Titanium alloy (Ti-6Al-4V). The results show that the pulse compression-based time domain analysis of the captured thermal data over the test specimen has improved the visibility, contrast, and detectability of the anomalies regarding the frequency domain. Further, the findings depicted using the various approaches have been contrasted using the correlation coefficient as the figures of merit.

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