Fig. 1. Model of optical fiber pasted. (a) oxy surface; (b) oyz surface

Fig. 2. Strain transfer rate curves of different adhesion lengths

Fig. 3. Partial enlargement of strain transfer rate curves

Fig. 4. Strain transfer rate curves of different shear moduli of coating layers

Fig. 5. Partial enlargement of strain transfer rate curves of different shear moduli of coating layers

Fig. 6. OFDR sensing measurement principle

Fig. 7. Equal-strength beam with different fibers

Fig. 8. Equal-strength beam with fibers of different lengths

Fig. 9. Experimental and theoretical strain transfer rate curves

Fig. 10. Schematic of fiber connection for redundant parts

Fig. 11. Strain measurement results of two fibers with a length of 20 cm

Fig. 12. Comparison of strain transfer rates of two segment fibers under different loads. (a) #1; (b) #2; (c) #3; (d) #4; (e) #5; (f) #6

Fig. 13. Difference of strain transfer rate of two fibers

Fig. 14. Schematic of pasting position of two types of optical fibers

Fig. 15. Strain measurement results of common single-mode fiber and polyimide coated optical fiber. (a) Strain measurement results; (b) maximum strain comparison of two types of optical fibers under each load level

Fig. 16. Strain transfer rates of two types of fibers. (a) #1; (b) #2; (c) #3; (d) #4; (e) #5; (f) #6

Fig. 17. Difference of strain transfer rate between different coating layers of fiber