High-Temperature Fiber Bragg Grating Sensor Array Based on Femtosecond Fiber Grating

Xian Zhao; Yongjie Wang; Huicong Li; Dengpan Zhang

doi:10.3788/LOP230752

Journals >Laser & Optoelectronics Progress >Volume 60 >Issue 11 >Page 1106032 > Article

Laser & Optoelectronics Progress
Vol. 60, Issue 11, 1106032 (2023)

High-Temperature Fiber Bragg Grating Sensor Array Based on Femtosecond Fiber Grating

Xian Zhao^1,2, Yongjie Wang^2,*, Huicong Li^2,3, and Dengpan Zhang¹

Author Affiliations

¹School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China

²Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China

³Center of Materials Science and Optoelectronic Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

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DOI: 10.3788/LOP230752 Cite this Article Set citation alerts

Xian Zhao, Yongjie Wang, Huicong Li, Dengpan Zhang. High-Temperature Fiber Bragg Grating Sensor Array Based on Femtosecond Fiber Grating[J]. Laser & Optoelectronics Progress, 2023, 60(11): 1106032 Copy Citation Text

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Abstract

In this study, a high-temperature sensing array based on a femtosecond fiber grating was designed to address the temperature measurement needs of high-power spallation targets. The temperature range and mechanical strength of the sensor were enhanced using a femtosecond laser-engraved fiber grating and a tubular encapsulation method. The annealing process, i.e., annealing steps, annealing time, and annealing temperature, was investigated and optimized. Additionally, multiple annealing (800 ℃, 20 h) was conducted to improve the stability of the fiber Bragg grating. An accurate fitting function of temperature-wavelength was obtained through its calibration test. The sensor has an accuracy of ±0.2 ℃ in the temperature range of 100-500 ℃, with good repeatability. Moreover, on-site testing results indicate that the proposed sensor can achieve precise temperature testing of high-power spallation targets.

Keywords

fiber Bragg grating high accuracy high temperature sensor temperature measurement

λ_{B} = 2 n_{e f f} Λ

，（1）

Δ Λ = α_{f} Λ Δ T

，（2）

Δ n_{e f f} = ξ_{f} \cdot n_{e f f} \cdot Δ T

，（3）

\frac{Δ λ_{B}}{λ_{B}} = \frac{Δ Λ}{Λ} + \frac{Δ n_{e f f}}{n_{e f f}} = (α_{f} + ξ_{f}) Δ T

。（4）

\frac{Δ λ_{B}}{Δ T} = λ_{B} \times (\frac{d λ_{B}}{d T} + \frac{1}{2} \frac{{λ_{B}}^{2}}{d T^{2}} Δ T + \frac{1}{6} \frac{{λ_{B}}^{3}}{d T^{3}} Δ T^{2} + \dots)

。（5）

\begin{array}{l} \frac{Δ λ_{B}}{λ_{B}} = [p_{e f f} α_{f} + ξ_{f} + (1 - p_{e f f}) α_{d}] Δ T + \frac{1}{2} \{p_{e f f} \frac{d α_{f}}{d T} + \frac{d ξ_{f}}{d T} + (1 - p_{e f f}) \frac{d α_{d}}{d T} + {[p_{e f f} α_{f} + ξ_{f} + (1 - p_{e f f}) α_{d}]}^{2}\} \times \\ Δ T^{2} + \frac{1}{6} \{p_{e f f} \frac{d {α_{f}}^{2}}{d T^{2}} + \frac{d {ξ_{f}}^{2}}{d T^{2}} + (1 - p_{e f f}) \frac{d {α_{d}}^{2}}{d T^{2}} + {[p_{e f f} α_{f} + ξ_{f} + (1 - p_{e f f}) α_{d}]}^{3}\} Δ T^{3} \end{array}

，（6）

λ_{B} (T) = A T + B T^{2} + C T^{3} + D

，（7）

λ_{B 1} (T) = - 6.18890 \times 10^{- 9} T^{3} + 9.9492 \times 10^{- 6} T^{2} + 0.0091 T + 1528.61

，（8）

λ_{B 2} (T) = - 5.61912 \times 10^{- 9} T^{3} + 9.9490 \times 10^{- 6} T^{2} + 0.0089 T + 1536.02

，（9）

λ_{B 3} (T) = - 3.12486 \times 10^{- 9} T^{3} + 7.2460 \times 10^{- 6} T^{2} + 0.0098 T + 1543.14

，（10）

λ_{B 4} (T) = - 8.40146 \times 10^{- 9} T^{3} + 1.2962 \times 10^{- 5} T^{2} + 0.0080 T + 1549.97

，（11）

λ_{B 5} (T) = - 4.11900 \times 10^{- 9} T^{3} + 8.4032 \times 10^{- 6} T^{2} + 0.0098 T + 1557.01

。（12）

Xian Zhao, Yongjie Wang, Huicong Li, Dengpan Zhang. High-Temperature Fiber Bragg Grating Sensor Array Based on Femtosecond Fiber Grating[J]. Laser & Optoelectronics Progress, 2023, 60(11): 1106032

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