Sub-surface damage detection in marble structures using THz time domain and laser feedback interferometric imaging

Aparajita Bandyopadhyay; Karl Bertling; Diksha Garg; Khushboo Singh; Tim Gillespie; Yah Leng Lim; Lianhe Li; Paul Dean; Dragan Indjin; Edmund H. Linfield; A. Giles Davies; Aleksandar D. Rakic; Amartya Sengupta

doi:10.1117/12.2592548

8 July 2021 Sub-surface damage detection in marble structures using THz time domain and laser feedback interferometric imaging

Aparajita Bandyopadhyay, Karl Bertling, Diksha Garg, Khushboo Singh, Tim Gillespie, Yah Leng Lim, Lianhe Li, Paul Dean, Dragan Indjin, Edmund H. Linfield, A. Giles Davies, Aleksandar D. Rakic, Amartya Sengupta

Author Affiliations +

Proceedings Volume 11784, Optics for Arts, Architecture, and Archaeology VIII; 117840T (2021) https://doi.org/10.1117/12.2592548
Event: SPIE Optical Metrology, 2021, Online Only

Abstract

This present collaborative research, undertaken in two different hemispheres, in an effort to address the challenge of early structural and sub-surface assessment of heritage marble architectures, like the Taj Mahal, using two complementary non-contact, non-invasive imaging techniques in the THz spectral range. In our previous work, it was already demonstrated that the complementary techniques of broadband Terahertz Time Domain Imaging (THz-TDI) and microRaman spectroscopy are successful in probing volume and surface damage in marble with Pietra-dura work. In the present work, the unique combination of THz-TDI and highly sensitive THz-Laser Feedback Interferometry (THz-LFI) have been explored to study sub-surface damage and irregularities of marble structures with Pietra-dura motif. These optical techniques hold immense possibility in large-scale architectural restoration projects as they collectively provide accurate structural depth profile up to several inches into the volume of the marble including the strain generated within the structure leading to potential cracks.

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Citation Download Citation

Aparajita Bandyopadhyay, Karl Bertling, Diksha Garg, Khushboo Singh, Tim Gillespie, Yah Leng Lim, Lianhe Li, Paul Dean, Dragan Indjin, Edmund H. Linfield, A. Giles Davies, Aleksandar D. Rakic, and Amartya Sengupta "Sub-surface damage detection in marble structures using THz time domain and laser feedback interferometric imaging", Proc. SPIE 11784, Optics for Arts, Architecture, and Archaeology VIII, 117840T (8 July 2021); https://doi.org/10.1117/12.2592548

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