Cui Zhiru, Gong Jianhui, Wang Chen, Che Nana, Zhao Yanshuang, Chai Quan, Qi Haifeng, Lewis Elfed, Ren Jing, Zhang Jianzhong, Yang Jun, Yuan Libo, Peng Gang-Ding
Key Lab of In-Fiber Integrated Optics of Ministry of Education, Harbin Engineering University, Harbin 150001, China.
Laser Research Institute, Qilu University of Technology (Shandong Academy of Science), Jinan 250100, China.
Sensors (Basel). 2019 May 17;19(10):2293. doi: 10.3390/s19102293.
A regenerated fiber Bragg grating (RFBG) in silica fiber was used to observe the viscous relaxation process of the host silica fiber at high temperatures of around 1000 °C. Two factors, preannealing time and loaded tension, which affect viscous relaxation, were observed. When an RFBG is stretched after a longer preannealing, the measured viscosity of the optical fiber was observed to reach equilibrium faster, which means that preannealing accelerates viscous relaxation. A similar acceleration phenomenon was also observed when a larger load was applied to stretch the optical fiber, although the acceleration effect of loaded tension was not as strong as in the preannealing case. The results play an active role in establishing effective optical-fiber devices for application in high-temperature environments.
采用石英光纤中的再生光纤布拉格光栅（RFBG）来观测主体石英光纤在约1000℃高温下的粘性弛豫过程。观测了影响粘性弛豫的两个因素，即预退火时间和加载张力。当在较长时间预退火后拉伸RFBG时，观测到光纤的测量粘度达到平衡的速度更快，这意味着预退火加速了粘性弛豫。当施加更大的负载来拉伸光纤时，也观察到了类似的加速现象，尽管加载张力的加速效果不如预退火情况那么显著。这些结果对于建立适用于高温环境的有效光纤器件具有积极作用。
