Temperature sensing capacity of fiber Bragg grating at liquid nitrogen temperature

Abstract

According to the temperature sensing model of the fiber Bragg grating (FBG), a theoretical method of temperature sensing capacity of FBG is proposed. Based on the temperature sensing model of FBG, a temperature sensing experiment was completed at liquid nitrogen temperature (-196°C). The theoretical and experimental results were compared and analyzed, which show that at liquid nitrogen temperature or in a large-scope temperature sensing, the relationship between thermal variation ΔT and relative shift of reflected center wavelength Δλ_B/λ_B of FBG is nonlinear and conic multinomial.

Keywords

fiber Bragg grating (FBG) / optical fiber sensing / temperature sensing / liquid nitrogen temperature

References

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg