Fig. 1. Binocular DIC measurement system with dual-plane mirror

Fig. 2. Schematic diagram of subset-based binocular DIC measurement system

Fig. 3. Analysis of specular reflection transformation

Fig. 4. Obtaining mirror position equations

Fig. 5. 3D reconstruction of corner points based on common vertical midpoint method

Fig. 6. Diagram of experimental setup. (a) Mirror-assisted binocular DIC measurement system; (b) physical picture of coin; (c) physical picture of five-edge aluminum column; (d) heating furnace

Fig. 7. Partial calibration images of mirror position. (a) Left camera; (b) right camera

Fig. 8. Physical picture of game coins

Fig. 9. 3D reconstruction of game coins. (a) Reconstruction effect of proposed method; (b) reconstruction effect of method of spraying diffuse spots on mirror surface

Fig. 10. Reconstruction results of outer surfaces of aluminum column

Fig. 11. Thermal deformation results of five outer surfaces of aluminum column. (a) Surface A; (b) surface B; (c) surface C; (d) surface D; (e) surface E

Fig. 12. Height variation trend of plane A to E during temperature reduction

Fig. 13. Deviation values of height changes during temperature reduction for both methods

Fig. 14. Mesh division and thermal deformation simulation of specimen by Ansys. (a) Finite element meshing map; (b) simulation result of thermal deformation