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Each of the FBG center wavelengths of the triaxial vibration sensor.
| Number of FBGs | #1FBG | #2FBG | #3FBG | #4FBG |
|---|---|---|---|---|
| Initial center wavelength/nm | 1538.047 | 1543.369 | 1551.967 | 1557.016 |
| Center wavelength after prestress/nm | 1538.715 | 1544.052 | 1552.312 | 1557.407 |
| Center wavelength shift after prestress/nm | 0.668 | 0.683 | 0.345 | 0.391 |
