Fig. 1. Experimental setup for high temperature strain characteristics of FBG sensor

Fig. 2. (a) Variation in central wavelength of FBG with time at 1000 ℃; (b) variations in 3 dB bandwidth and SMSR with time

Fig. 3. Variation in central wavelength with temperature

Fig. 4. Variation in Δλ at 300 ℃ and 400 ℃ with time

Fig. 5. (a) Variation in Δλ with time in 500-800 ℃; (b) partial enlarged view of Fig. 5(a)

Fig. 6. Variation in central wavelength of FBG with time at different temperatures. (a) 300 ℃; (b) 400 ℃; (c) 500 ℃

Fig. 7. Variations in 3 dB bandwidth of FBG and SMSR at different temperatures. (a) 300 ℃; (b) 400 ℃; (c) 500 ℃

Fig. 8. Variation in Δλ with time in 600-800 ℃