A IR-Femtosecond Laser Hybrid Sensor to Measure the Thermal Expansion and Thermo-Optical Coefficient of Silica-Based FBG at High Temperatures

作者：Li, Litong^*; Lv, Dajuan; Yang, Minghong^*; Xiong, Liangming; Luo, Jie

来源：Sensors (Switzerland), 2018, 18(2): 359.

DOI：10.3390/s18020359

• fiber optics sensor
• IR-femtosecond laser
• high temperatures
• thermal expansion coefficient
• thermo-optical coefficient

In this paper, a hybrid sensor was fabricated using a IR-femtosecond laser to measure the thermal expansion and thermo-optical coefficient of silica-based fiber Bragg gratings (FBGs). The hybrid sensor was composed of an inline fiber Fabry-Perot interferometer (FFPI) cavity and a type-II FBG. Experiment results showed that the type-II FBG had three high reflectivity resonances in the wavelength ranging from 1100 to 1600 nm, showing the peaks in 1.1, 1.3 and 1.5 mu m, respectively. The thermal expansion and thermo-optical coefficient (1.3 mu m, 1.5 mu m) of silica-based FBG, under temperatures ranging from 30 to 1100 degrees C, had been simultaneously calculated by measuring the wavelength of the type-II FBG and FFPI cavity length.

• 出版日期2018-2
• 单位武汉理工大学