Fig. 1. Schematic diagram of focal meter measurement based on Hartmann method

Fig. 2. Schematic diagram of Hartmann diaphragm

Fig. 3. Schematic diagram of circular aperture Fresnel diffraction

Fig. 4. Simulation diagram of r=0.1 mm. (a) Diffraction screen; (b) patterns after diffraction; (c) three-dimensional display of diffraction patterns; (d) normalized intensity distribution of diffraction patterns

Fig. 5. Normalized light intensity waveforms of diffraction pattern under different circular hole radii

Fig. 6. Two-hole interference principle diagram

Fig. 7. Two-hole interference simulation diagram

Fig. 8. Relationship between stripe spacing and two-hole spacing

Fig. 9. Programming flowchart

Fig. 10. Experimental setup

Fig. 11. Three sets of parameters Hartmann diaphragm imaging diagram. (a) (r, d, m, n)=(0.2,0.8,9,9); (b) (r, d, m, n)=(0.1,0.75,9,11); (c) (r, d, m, n)=(0.04,0.9,7,11)

Fig. 12. Actual picture of Hartmann diaphragm when r=0.2 mm and d=0.8 mm