Fig. 1. Optical path of Hartmann detector calibration

Fig. 2. Simulation of beam propagation in collimator

Fig. 3. Spot plots on the receiving screen at different locations from the light source. (a) 400 mm; (b) 700 mm; (c) 1000 mm

Fig. 4. Schematic diagram of beam propagation with diaphragm

Fig. 5. Distributions of illumination intensities on the receiving screen under different diaphragm thicknesses. (a) 1 mm; (b) 20 mm

Fig. 6. Variation in stray light coefficient with diaphragm thickness

Fig. 7. Variation in stray light coefficient with diaphragm cone angle

Fig. 8. Distributions of illumination intensities on receiving screen at different locations. (a) 200 mm; (b)1000 mm

Fig. 9. Spot measurement results before and after placing the diaphragm. (a) Schematic diagram of placing the sulfuric acid paper ; light spots at (b) 400 mm, (c) 700 mm, (d) 1000 mm before placing the sulphate paper ; light spots at (e) 200 mm, (f) 1000 mm after placing the sulphate paper

Fig. 10. Comparison of Hartmann measurement results before and after placing the diaphragm. (a) Spot array without diaphragm; (b) wavefront without diagram; (c) spot array with diaphragm; (d) wavefront with diaphragm