Fig. 1. OFDR distributed optical fiber temperature/strain measurement system

Fig. 2. Spectral drift diagram

Fig. 3. Schematic illustration of cross-correlation algorithm based on adapted range

Fig. 4. Cross-correlation results of 500 ℃ temperature sensing. (a) Common correlation; (b) correlation based on adapted range

Fig. 5. Demodulation time of common correlation algorithm and cross-correlation algorithm based on adapted range

Fig. 6. Temperature experiment device

Fig. 7. Results of temperature testing. (a) Wavelength offset change with fiber length at different temperatures; (b) temperature-wavelength fitting

Fig. 8. Strain experiment device

Fig. 9. Strain testing curves