期刊
INFRARED PHYSICS & TECHNOLOGY
卷 91, 期 -, 页码 206-213出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.infrared.2018.04.018
关键词
Truncated correlation photothermal coherence tomography; Wood; Inlay; Non-destructive testing (NDT)
资金
- Natural Sciences and Engineering Research Council (NSERC) Discovery Grants Program
- Canada Foundation for Innovation (CFI) Research Chairs Program
- NSERC - Collaborative Research and Training Experience (CREATE)
The aim of this research is to investigate the suitability of truncated correlation photothermal coherence tomography (TC-PCT) for the non-destructive imaging of a replica of a real inlay to identify subsurface features that often are invisible areas of vulnerability and damage. Defects of inlays involve glue-rich areas, glue-starved areas, termite attack, insect damage, and laminar splitting. These defects have the potential to result in extensive damage to the art design layers of inlays. Therefore, there is a need for an imaging technique to visualize and determine the location of defects within the sample. The recently introduced TC-PCT modality proved capable of providing 3-D images of specimens with high axial resolution, deep subsurface depth profiling capability, and high signal-to-noise ratio (SNR). Therefore, in this study the authors used TC-PCT to image a fabricated inlay sample with various natural and artificial defects in the middle and top layers. The inlay in question reproduces to scale a piece of art preserved in the Mirror room of the Castle Laffitte in France. It was built by a professional restorer following the ancient procedure named element by element. Planar TC-PCT images of the inlay were stacked coherently to provide 3-D visualization of areas with known defects in the sample. The experimental results demonstrated the identification of defects such as empty holes, a hole filled with stucco, subsurface delaminations and natural features such as a wood knot and wood grain in different layers of the sample. For this wooden sample that has a very low thermal diffusivity, a depth range of 2 mm was achieved. (C) 2018 Elsevier B.V. All rights reserved.
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