光纤布拉格光栅
材料科学
拉伤
光纤
光学
复合材料
光电子学
医学
物理
内科学
波长
作者
Xuehao Hu,Yang Liu,Heming Wei,Chuanxin Teng,Qianqing Yu,Zhiling Luo,Zhenggang Lian,Hang Qu,Christophe Caucheteur
出处
期刊:Optics Letters
[The Optical Society]
日期:2024-04-22
卷期号:49 (11): 2869-2869
摘要
In this Letter, we propose an in-line tilted fiber Bragg grating sensor for temperature and strain measurements. The grating is inscribed in a specialty optical fiber using tightly focused femtosecond laser pulses and the line-by-line direct writing method. Beside the central core in which the grating is produced, a hollow channel filled with glycerol aqueous solution significantly improves the sensitivity of the fiber cladding modes due to its high thermo-optic coefficient. We show that the temperature sensitivity of the core mode is 9.8 pm/°C, while the one of the cladding modes is strongly altered and can reach −24.3 pm/°C, in the investigated range of 20–40°C. For the strain measurement, sensitivities of the core mode and the cladding modes are similar (∼0.60 pm/με) between 0 and 2400 με. The significative difference of temperature sensitivity between the two modes facilitates the discrimination of the dual parameters in simultaneous measurements.
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