Fig. 1. Schematic diagram of double-loop desensitization structure

Fig. 2. 3D mesh graph

Fig. 3. Tensile load diagram. (a) Displacement diagram in horizontal direction; (b) equivalent stress diagram

Fig. 4. Compression load diagram. (a) Displacement diagram in horizontal direction; (b) equivalent stress diagram

Fig. 5. Schematic diagram of experimental device

Fig. 6. Data fitting results. (a) Results of strain and wavelength fitting; (b) regular residual of measured strain value