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Title: Impact of high UV fluences on the mechanical and sensing properties of polymer optical fibers for high strain measurements
Authors: Bonefacino, J 
Cheng, X 
Pun, CFJ 
Boles, ST 
Tam, HY 
Issue Date: 2020
Source: Optics express, 2020, v. 28, no. 2, p. 1158-1167
Abstract: 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/m epsilon for FBG inscribe with 325 nm laser, and 1.345 nm/m epsilon 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.
Publisher: Optical Society of America
Journal: Optics express 
EISSN: 1094-4087
DOI: 10.1364/OE.378634
Rights: © 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement (
© 2020 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.
Journal © 2020
The following publication Julien Bonefacino, Xin Cheng, Chi-Fung Jeff Pun, Steven T. Boles, and Hwa-Yaw Tam, "Impact of high UV fluences on the mechanical and sensing properties of polymer optical fibers for high strain measurements," Opt. Express 28, 1158-1167 (2020) is available at
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