材料科学
通量
激光器
光纤布拉格光栅
光学
极限抗拉强度
光纤
光纤激光器
复合材料
激光线宽
光电子学
波长
纤维
物理
作者
Julien Bonefacino,Xin Cheng,Chi-Fung Jeff Pun,Steven T. Boles,Hwa‐Yaw Tam
出处
期刊:Optics Express
[The Optical Society]
日期:2019-12-12
卷期号:28 (2): 1158-1158
被引量:7
摘要
PMMA-based fibers are widely studied for strain measurements and show repeatable results for Fiber Bragg Gratings (FBGs) inscribed using 325 nm laser and 248 nm laser. However, there is no available material mechanical behavior characterization of the UV source impact on the fiber properties. In this manuscript, fibers are irradiated with high fluence of 325 nm and 248 nm lasers and the fibers properties are investigated using dynamic mechanical analysis and tensile strain for potential use of these fibers past the yield point. It is demonstrated that the UV sources shifted the ultimate tensile strength and changed the strain hardening behavior. Tensile strain measurements show excellent repeatability for gratings inscribed with these two sources with similar sensitivity of 1.305 nm/mɛ for FBG inscribe with 325 nm laser, and 1.345 nm/mɛ for grating written with 248 nm laser in the range 0 to 1.5 % elongation. Furthermore, tests far beyond the yield point (up to 2.8 % elongation) show that grating inscribed with lower UV wavelength exhibit hysteresis. Finally, we demonstrate that 248 nm laser fluence shall be chosen carefully whereas even high 325 nm laser fluence do not critically impact the sensor properties.
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