Fig. 1. Operating principle diagram of four quadrant detector

Fig. 2. Sketch of laser semi-active optical system

Fig. 3. Sketch of low-cost visual testing

Fig. 4. Optical system structure

Fig. 5. Spot of different field

Fig. 6. Simulation results of 0° field of view spot uniformity

Fig. 7. Lens simulation analysis

Fig. 8. Spots distribution

Fig. 9. Principle diagram of visual testing system

Fig. 10. Collecting the spot and energy distribution

Fig. 10. [in Chinese]