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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From: RETRACTED ARTICLE: Intelligent electrical equipment fiber Bragg grating temperature measurement system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