Fig. 1. Microlens array scanning imaging optical system

Fig. 2. Variation curves of detection distance with fill factor α_en

Fig. 3. PSF of microlens array system with different α_ex（z=80 mm, λ=4 µm, D_L=6.8 mm）

Fig. 4. MTF of microlens array system with different α_ex

Fig. 5. Paraxial model of microlens array subunit. (a) Static state; (b) scanning state

Fig. 6. Effect of parameters on fill factors. (a) Numerical aperture angle; (b) scanning field angle; (c) staring field angle

Fig. 7. System design flow

Fig. 8. Structure diagram of MLA system

Fig. 9. Test results of design system. (a) PSF; (b) MTF; (c) spot diagrams