Infrared and Laser Engineering, Volume. 50, Issue 3, 20200270(2021)
Design of infrared dual-band common path annular aperture ultrathin imaging system
Figures & Tables(15)
Fig. 1. Principle and structure of ultrathin imaging optical system
Fig. 2. Relation curve between half field of view and obscuration ratio when
Fig. 3. Relation curve between outer diameter and obscuration ratio
Fig. 4. Structure of infrared dual-band common path ultrathin system
Fig. 6. Spot diagram of infrared dual-band common path ultrathin system
Fig. 7. MTF of infrared dual-band common path ultrathin imaging system at −40 ℃
Fig. 8. MTF of infrared dual-band common path ultrathin imaging system at 20 ℃
Fig. 9. MTF of infrared dual-band common path ultrathin imaging system at 80 ℃
Table 1. [in Chinese]
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Parameter Value Effective Focal length/mm 50 Effective aperture diameter/mm 50 Field of view/(°) 14 Length of the system/mm ≤32 Wavelength/μm 3-5, 8-10
Table 2. [in Chinese]
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Structural type Track/mm Diameter/mm Obscuration ratio 2 reflectors 65.0 62.4 0.598 4 reflectors 32.5 81.2 0.788 6 reflectors 21.7 96.3 0.855 8 reflectors 16.3 109.2 0.889
Table 3. [in Chinese]
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Surface Radius /mm Thickness /mm Glass Object Infinity Infinity − Stop −535.73 25.5 IRG24 2 −99.92 −24.1 Mirror 3 −137.86 19.6 Mirror 4 161.59 −20.8 Mirror 5 786.41 21.4 Mirror 6 −1157.55 1.1 − Image Infinity − −
Table 4. [in Chinese]
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Surface A B C D E 1 0.00 3.85E-07 −2.36E-10 1.18E-13 −5.27E-17 2 0.00 2.99E-07 6.25E-12 −2.84E-14 0.00 3 0.00 1.96E-06 −2.15E-09 9.36E-13 0.00 4 0.00 −1.87E-06 −8.15E-09 1.82E-11 −7.81E-15 5 0.00 −5.20E-06 −2.54E-09 6.73E-11 8.77E-14 6 0.00 −4.72E-04 1.39E-06 −2.22E-08 1.47E-10
Table 5. [in Chinese]
View tableView in ArticleTable 5. [in Chinese]
Tolerance type Tolerance parameter Thickness/mm ±0.01 Element decenter/mm ±0.02 Element tilt/(′) ±1 Surface decenter/mm ±0.01 Surface tilt/(′) ±1 Aspheric PV value/μm ±0.2 Refractive index ±0.001 Test wavelength/nm 632.8
Table 6. [in Chinese]
View tableView in ArticleTable 6. [in Chinese]
Wavelength/μm Field/(°) Tangential Sagittal Nominal Estimated Nominal Estimated 3-5 0 0.66 0.40 0.65 0.41 4.9 0.59 0.38 0.71 0.49 7 0.48 0.31 0.69 0.46 8-10 0 0.39 0.34 0.42 0.35 4.9 0.37 0.33 0.41 0.33 7 0.34 0.30 0.40 0.33
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Qi Wang, Mingxu Piao, Yutong Meng, Xudong Gao. Design of infrared dual-band common path annular aperture ultrathin imaging system[J]. Infrared and Laser Engineering, 2021, 50(3): 20200270
Paper Information
Category: Optical design
Received: Jul. 8, 2020
Accepted: --
Published Online: Jul. 15, 2021
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