Abstract
During last decades, sensor elements based on the fiber Bragg grating (FBG) have been widely studied and developed due to the advantages of immunity to electromagnetic interference, compact size, high precision, and so on. The FBG itself is sensitive to axial strain and temperature variation directly and can indirectly measure these complex physical parameters, such as pressure, displacement, and vibration, by using some specially designed elastic structures to convert them into the axial strain of the FBG. Whether the FBG is fixed on the measured object to measure the strain directly or fixed on an elastic structure body to measure other physical quantities, these types of FBGs could be collectively called as strain sensing FBGs. The packaging of the FBG has important influence on FBG characteristics that directly affect the measurement accuracy, such as strain transfer, temperature characteristic, and spectral shape. This paper summarizes the packaging methods and corresponding temperature compensation methods of the currently reported strain sensing FBGs, focusing especially on fully pasted FBG, pre-stretched FBG with double-end fixed, and metallic packaging. Furthermore, the advantages and drawbacks of different packaging methods have been analyzed, which can provide a reference for future researches.
Highlights
In 1978, the presence of fiber grating was first demonstrated by Hill et al at the Ottawa Communication Research Center in Canada [1, 2]
Yi KUANG et al.: Packaging and Temperature Compensation of Fiber Bragg Grating for Strain Sensing: A Survey long-period fiber grating(LPFG), among them, fiber Bragg grating (FBG), which is the earliest researched grating, is the most widely used in the optical fiber sensing field
Whether the FBG is fixed on the measured object to measure the strain directly or fixed on an elastic structure body to measure other physical quantities, these types of FBGs can be collectively called as strain sensing FBGs
Summary
Yi KUANG et al.: Packaging and Temperature Compensation of Fiber Bragg Grating for Strain Sensing: A Survey long-period fiber grating(LPFG), among them, FBG, which is the earliest researched grating, is the most widely used in the optical fiber sensing field. When the axial strain and temperature vary, the FBG reflective central wavelength will regularly shift. FBG is arranged at the deformation part of the elastic body and sensing deformation strain, which causes the shift of wavelength. After calibration experiment, these physical quantities can be obtained by detecting the wavelength shifts. Whether the FBG is fixed on the measured object to measure the strain directly or fixed on an elastic structure body to measure other physical quantities, these types of FBGs can be collectively called as strain sensing FBGs. The packaging method of the FBG has important influence on the characteristics that directly affect the measurement accuracy, such as strain transfer, temperature characteristics, and spectral shape.
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