Theoretical error model of FBG-based surface temperature measurement and its accuracy enhancement

LETTER

Liang Jin, University of Birmingham & Wuhan University of Technology Joint Key Laboratory of Intelligent Machinery">Ruiya Li, Yongkang Wang, University of Birmingham & Wuhan University of Technology Joint Key Laboratory of Intelligent Machinery">Yuegang Tan, University of Birmingham & Wuhan University of Technology Joint Key Laboratory of Intelligent Machinery">Zude Zhou

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Keywords: surface temperature, fiber Bragg grating, measurement error, accuracy enhancement

JOURNAL FREE ACCESS

2024 Volume 21 Issue 13 Pages 20240098

DOI https://doi.org/10.1587/elex.21.20240098

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Abstract

This paper aims to establish a mathematical error model for surface temperature measurement based on FBG and to enhance its measurement precision. Firstly, an improved temperature-sensing model for FBG is established. Subsequently, the mathematical model for FBG-based surface temperature measurement error is developed. The experiments are conducted using a controllable surface heat source. Experimental results demonstrate good consistency among the errors obtained from the mathematical model, the finite element model, and experimental testing. Finally, corrosion processing and thermally conductive silicone packaging methods are proposed, elevating the bare FBG’s surface temperature measurement accuracy from approximately 4°C to approximately 1°C.

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