Ningyan Xu, Lu Chen, Jing Huang, Yutong Zou, Qun Yuan, Zhishan Gao. Review of design methodology for starting-point of freeform surface imaging optical system[J]. Infrared and Laser Engineering, 2022, 51(2): 20210852
- Infrared and Laser Engineering
- Vol. 51, Issue 2, 20210852 (2022)
Fig. 1. Different off-axis structures. (a) 4-type structure off-axis two-reflective system; (b) Z-type structure two-reflective system; (c)-(j) Eight structural types of off-axis three-reflective system
Fig. 2. Schematic of the principle of partial differential equation method
Fig. 3. Schematic of the principle of SMS
Fig. 4. Schematic of the principle of CI-2D[27]. (a) Initial structure; (b) Sampling feature rays; (c) Construction of surface and iteration; (d) Starting-point of freeform surface imaging optical system
Fig. 5. Schematic of expending FOV. (a) Expanding the FOV in the X ; (b) Expanding the FOV in the Y
Fig. 6. Flow chart of alternate optimization method based on freeform surface
Fig. 7. Optical path of ellipsoidal mirror system. (a) Single ellipsoid mirror; (b) Overlapping double ellipsoidal mirrors; (c) A head-mounted display system[37]
Fig. 8. Design of single reflector[38]
Fig. 9. Design examples of fusion of parabolid. (a) Czerny-Turner imaging spectrometer[40]; (b) f-θ telecentric scanning system[41]
Fig. 10. Design steps of fusion of parabolid[42]. (a) Split FOV/aperture; (b) Solve parameter of sub-mirror of off-axis paraboloid; (c) Surface fusion
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