Fig. 1. Schematic diagram of the FBG rotor temperature measurement system

Fig. 2. Schematic diagram of the trajectory of the rotor shaft axis

Fig. 3. Schematic diagram of coupling between collimators

Fig. 4. The variation of coupling loss under different q-value conditions and the most distorted scan spectra

Fig. 5. The influence of q on the maximum scanning error of the central wavelength and peak finding error of spectrum

Fig. 6. Correlation under certain error conditions between whirling frequency and scanning frequency

Fig. 7. Changing law of maximum scanning error of center wavelength with radial displacement amplitude， axial ratio of axis trajectory and axis deviation amplitude

Fig. 8. Schematic and physical diagram of the collimator coupling loss test system

Fig. 9. Change curve of Coupling loss with each mismatch

Fig. 10. The misalignment caused by rotor whirling and its equivalent transformation

Fig. 11. Schematic diagram of aberration spectrum acquisition test system

Fig. 12. FBG reflection power spectrum acquisition test system diagram

Fig. 13. The maximum central wavelength scanning error varies with q

Fig. 14. The maximum central wavelength scanning error varies with axial ratio n

Fig. 15. Maximum central wavelength and peak search error of the spectrum under various rotor whirling conditions