Differential FBG sensor for temperature-independent refractive index measurement

Shuai Gao; Long Jin; Li-Peng Sun; Jie Li; Bai-Ou Guan

doi:10.1117/12.2034251

15 October 2013 Differential FBG sensor for temperature-independent refractive index measurement

Shuai Gao, Long Jin, Li-Peng Sun, Jie Li, Bai-Ou Guan

Proceedings Volume 8924, Fourth Asia Pacific Optical Sensors Conference; 89243H (2013) https://doi.org/10.1117/12.2034251
Event: Asia Pacific Optical Sensors Conference 2013, 2013, Wuhan, China

Abstract

We demonstrated a simple method for temperature-independent refractive index measurement by use of two cascaded fiber Bragg gratings fabricated in single-mode fiber and microfiber, respectively. The reflective peaks of the two FBGs exhibit almost identical temperature sensitivity of 10.1 pm/°C and different responses to ambient refractive index. Based on the differential measurement method, of the issue of temperature cross-sensitivity for FBG sensors is solved. The refractive-index sensitivity of the sensor is 17.22 nm/RIU when the diameter of microfiber is 6.5 μm.

Citation Download Citation

Shuai Gao, Long Jin, Li-Peng Sun, Jie Li, and Bai-Ou Guan "Differential FBG sensor for temperature-independent refractive index measurement", Proc. SPIE 8924, Fourth Asia Pacific Optical Sensors Conference, 89243H (15 October 2013); https://doi.org/10.1117/12.2034251

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