High-temperature strain sensor based on sapphire fiber Bragg grating

光纤布拉格光栅 材料科学 蓝宝石 拉伤 光纤传感器 光学 长周期光纤光栅 光纤 保偏光纤 光电子学 激光器 物理 医学 内科学
作者
Jun He,Zhuoda Li,Xizhen Xu,Qing-Ming Tan,Xiaoyu Weng,Liwei Liu,Junle Qu,Changrui Liao,Yiping Wang
出处
期刊:Optics Letters [Optica Publishing Group]
卷期号:49 (3): 446-446 被引量:5
标识
DOI:10.1364/ol.509397
摘要

Sapphire fiber Bragg grating (SFBG) is a promising high-temperature strain sensor due to its melting point of 2045°C. However, the study on the long-term stability of SFBG under high temperature with an applied strain is still missing. In this paper, we reported for the first time to our knowledge on the critical temperature point of plastic deformation of the SFBG and demonstrated that the SFBG strain sensor can operate stably below 1200°C. At first, we experimentally investigated the topography and the spectral characteristics of the SFBG at different temperatures (i.e., 25°C, 1180°C, and 1600°C) with applied 650 µε. The reflection peak of the SFBG exhibits a redshift of about 15 nm and broadens gradually within 8 h at 1600°C, and the tensile force value decreases by 0.60 N in this process. After the test, the diameter of the SFBG region decreases from 100 to 88.6 µm, and the grating period is extended from 1.76 to 1.79 µm. This indicates that the plastic deformation of the SFBG happened indeed, and it was elongated irreversibly. Moreover, the stability of the Bragg wavelength of the SFBG under high temperature with the applied strain was evaluated. The result demonstrates the SFBG can be used to measure strain reliably below 1200°C. Furthermore, the strain experiments of SFBG at 25°C, 800°C, and 1100°C have been carried out. A linear fitting curve with high fitness (R
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