Fig. 1. Schematic diagram of microelement

Fig. 2. Curvature calibration diagram

Fig. 3. Center wavelength offsets of sensors 1~7 under different curvatures

Fig. 4. Recursive iterative logic diagram

Fig. 5. Curvature calibration

Fig. 6. Force distribution diagram of bending experimental platform

Fig. 7. COMSOL sensor layout diagram

Fig. 8. COMSOL simulation force diagram

Fig. 9. Curvature change with arc length when 1200 g load is applied to the center of plate end

Fig. 10. Curvature changes with arc length when the left corner of the end is loaded 450 g (dotted line) and right cornor is loaded 800 g (solid line)

Fig. 11. Schematic diagram of the principle of curve shape reconstruction

Fig. 12. Schematic diagram of the principle of curve surface reconstruction

Fig. 13. Flow chart of the surface 3D reconstruction algorithm

Fig. 14. Experimental platforms for two stress cases

Fig. 15. Reconstruction and fitting of 3D surfaces under different stresses

Fig. 16. Comparison of plate end displacement under different stresses

Fig. 17. Relative errors of plate end displacement under different stresses

Fig. 18. Absolute errors of plate end displacement under different stresses

Fig. 19. Reconstruction and fitting of 3D surface under stress at both ends

Fig. 20. Comparison of plate end displacement under different load’s weight

Fig. 21. Relative errors of plate end displacement under different load’s weight

Fig. 22. Absolute errors of plate end displacement under different load’s weight