Fig. 1. Principle diagram of OFDR

Fig. 2. Flow chart of OFDR cross-correlation method with Fourier interpolation

Fig. 3. (a) Experimental setup of fiber temperature sensing; (b) spectrum shift caused by temperature variation

Fig. 4. (a) Picture of single mode fiber sticked on composite material; (b) diagram of strain experiment; (c) spectrum shift caused by strain

Fig. 5. (a) Spectrum shift in temperature sensing experiment at 56.8 ℃; (b) spectrum shift under downward force

Fig. 6. Linear fitting curves at different positions in temperature sensing experiment. (a) 2.22 m; (b) 3.04 m