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Table 2 The drift of the center wavelength of the fiber grating before and after encapsulation with different substrate materials (nm)

From: Intelligent electrical equipment fiber Bragg grating temperature measurement system

Name Copper tube Aluminum tube Copper sheet Aluminum sheet Epoxy glue PMMA
Center wavelength (before packaging) 1560.022 1560.241 1559.688 1559.955 1560.319 1560.168
Center wavelength (after packaging) 1559.885 1560.122 1559.587 1559.129 1559.926 1559.742
Wavelength drift (nm) 0.137 0.119 0.101 0.826 0.393 0.426