From Event: SPIE Commercial + Scientific Sensing and Imaging, 2017
Single crystal sapphire fiber is an excellent candidate for fiber-optic sensing in harsh environments owing to its superior optical, mechanical and thermal properties at elevated temperatures up to 1500ºC. We have carried out an experimental and theoretical investigation on the mechanical properties of nanostructured sapphire optical fiber (NSOF) cladded with nanoporous anodized aluminum oxide (AAO). The threshold thickness beyond which the integrity of AAO cladding will be compromised due to tensile stress as growth of AAO extends radially outward is determined. Bending tests are conducted to explore relationship of NSOF mechanical properties with AAO porosity and thickness as parameters. Bending simulations using Finite Element Method will be compared with our experimental results. Parallel bending tests are conducted using AAO-clad silica fiber for comparison. Numerical and analytical simulations are also conducted to reveal the stress development during aluminum conversion to AAO on fiber geometry. The knowledge established on mechanical properties of NSOF will be of critical importance in its design, production, and utilization for a variety of demanding applications such as sensing for energy generation and energy production systems.
Kai Liu, Padmalatha Kakanuru, Kishore Pochiraju, and Henry Du, "Mechanical properties of nanostructured sapphire optical fiber (Conference Presentation)," Proc. SPIE 10208, Fiber Optic Sensors and Applications XIV, 102080B (Presented at SPIE Commercial + Scientific Sensing and Imaging: April 11, 2017; Published: 6 June 2017); https://doi.org/10.1117/12.2262869.5460418195001.
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