Monitoring the micro-damage repair process inside composite using line-field spectral-domain optical coherence tomography

doi:10.19936/j.cnki.2096-8000.20220528.032

Abstract

Abstract: Detecting early micro-damage and monitoring repair process are of great significance to the safety of composite materials in service, a method based on line-field spectral-domain optical coherence tomography (LF-SD-OCT) is proposed to study the problem above in this paper, which can provide a micron scale section-image for composite material to inspect damage, and monitor damage repair process combined with image processing techniques. For verification, an inverted type LF-SD-OCT system is designed and established, which features the depth resolution of 5.20 μm, the depth range of 3.36 mm, the lateral resolution of 6.02 μm, and the viewfield width of 5.80 mm. Then, the internal micro-damage tomography of translucent silica gel, light-cured resin, and transparent ethylene-vinyl acetate copolymer (EVA) is carried out. Finally, based on the established system, the whole electron-thermal repair process of internal damage inside EVA is monitored in time. The results show that the method owns the excellent qualities of micron resolution and dynamic measurement, which is very suitable for damage inspection and repair sensing of composite materials.

Key words: composite material, damage repair, visual monitoring, optical coherence tomography

CLC Number:

TB332

YOU Ru-feng, HUANG Pin-bo, NI Zi-hao, XIE Sheng-li, BAI Yu-lei, DONG Bo. Monitoring the micro-damage repair process inside composite using line-field spectral-domain optical coherence tomography[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(12): 31-36.

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