Fig. 1. Experimental setup of the proposed temperature sensor based on enhanced vernier effect

Fig. 2. Interference spectrum of FPI，SI and Cascade

Fig. 3. Interference spectra at different temperatures

Fig. 4. Interference spectra of cascade sensors at different temperatures （a） T₀ ℃； （b） T₀₊₁ ℃

Fig. 5. FPI microscope drawing （a）and SI physical drawing （b）

Fig. 6. Interference spectra and peak wavelength curves of FPI,SI，cascade sensors at different temperatures

Fig. 7. Peak wavelength shift of spectral envelope with temperature rising and falling

Fig. 8. Stability experiment