Sub-surface damage detection in marble structures using THz time domain and laser feedback interferometric imaging techniques
Sub-surface damage detection in marble structures using THz time domain and laser feedback interferometric imaging techniques
复制标题
使用太赫兹时域和激光反馈干涉成像技术检测大理石结构的次表面损伤
DOI：
10.1117/12.2592548
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Bandyopadhyay A
中科院分区：
文献类型：
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作者：
Bandyopadhyay A
这项合作研究在两个不同的半球进行，旨在解决泰姬陵等遗产大理石建筑的早期结构和亚表面评估的挑战，使用两种在太赫兹光谱范围内互补的非接触、非侵入性成像技术。在我们以前的工作中，已经证明了宽带太赫兹时域成像(THz-TDI)和显微拉曼光谱的互补技术在大理岩体积和表面损伤的探测中是成功的。在本工作中，我们探索了THz-TDI和高灵敏度THz-激光反馈干涉术(THz-LFI)的独特组合，以研究具有Pietra-Dura图案的大理岩结构的亚表面损伤和不规则性。这些光学技术在大型建筑修复项目中具有巨大的可能性，因为它们共同提供了精确的结构深度轮廓，最高可达大理石体积的几英寸，包括结构内产生的导致潜在裂缝的应变。
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.