Infrared and Laser Engineering, Volume. 50, Issue 8, 20210042(2021)
Design of compact dual-field lens for visible light
Figures & Tables(21)
Fig. 1. Diagram of 32 mm focal length optical system with fixed stop position scheme
Fig. 2. Diagram of 126 mm focal length optical system with fixed stop position scheme
Fig. 3. Diagram of 32 mm focal length optical system with switchable stop position scheme
Fig. 4. Diagram of 126 mm focal length optical system with switchable stop position scheme
Fig. 5. MTF curves of 32 mm focal length with fixed stop position scheme
Fig. 6. MTF curves of 126 mm focal length with fixed stop position scheme
Fig. 7. MTF curves of 32 mm focal length with switchable stop position scheme
Fig. 8. MTF curves of 126 mm focal length with switchable stop position scheme
Table 1. Related optical indicators of observing and sighting system
View tableView in ArticleTable 1. Related optical indicators of observing and sighting system
Parameters Specifications Horizontal field angle/（°） ≥12（Detection）≥3（Recognition） Dimension of target/m 4.6×2.3（Equivalent length: 3.3） Operating range/km ≥5 Atmospheric visibility/km ≥10 Ambient illuminance/lux ≥300 Distortion ≤0.5%（Detection）
Table 2. Related specifications of the CMOS image sensor used
View tableView in ArticleTable 2. Related specifications of the CMOS image sensor used
Parameters Specifications Image sensor 1/1.9 in CMOS image sensor Valid pixels 1 920(H) ×1080(V) Pixel size 3.75 μm(H)×3.75 μm(V) Minimal illumination 0.1 lx
Table 3. Specific parameters of optical system with fixed stop position scheme
View tableView in ArticleTable 3. Specific parameters of optical system with fixed stop position scheme
Parameters Short focal length Long focal length Spectral range/nm 486 - 656 Effective focal length/mm 32 126 Fnumber 3.5 Object space angle/（°） 12.96 × 7.22 3.24 × 1.82 Total optical length/mm 170 Maximal effective aperture/mm Φ52 Focal length of zoom group/mm -42.30 Zoom stroke/mm 62.60
Table 4. Specific parameters of optical system with switchable stop position scheme
View tableView in ArticleTable 4. Specific parameters of optical system with switchable stop position scheme
Parameters Short focal length Long focal length Spectral range/nm 486 - 656 Effective focal length/mm 32 126 F number 2.3 3 Object space angle/(°) 13.18 × 7.30 3.28 × 1.84 Total optical length/mm 150 Maximal effective aperture/mm Φ42 Focal length of zoom group/mm -24.29 Zoom stroke/mm 35.97
Table 5. Material tolerances
View tableView in ArticleTable 5. Material tolerances
Items Value Refractive index/mm 1×10−4-5×10−4 Abbe-number 0.3%-0.5% Homogeneity/mm 2×10−6-5×10−6
Table 6. Manufacturing tolerances（
λ =546.1 nm）View tableView in ArticleTable 6. Manufacturing tolerances（
λ =546.1 nm）Items Value Fringe power/λ 1-2 Surface irregularity/λ 0.2-0.5 Central thickness/mm 0.02-0.05 Wedge/mm 0.005-0.01
Table 7. Alignment tolerances
View tableView in ArticleTable 7. Alignment tolerances
Items Value Airspace/mm 0.02-0.05 Tilt/rad 0.0005-0.001 Decenter & Roll/mm 0.02-0.05
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Enyuan Zhou, Yueqin Cao, Jianping Shi, Bo Chang, Jinhui Zhang, Wenhou Lu, Zhang Zhang, Meihua Xing, Guojun Lu. Design of compact dual-field lens for visible light[J]. Infrared and Laser Engineering, 2021, 50(8): 20210042
Paper Information
Category: Optical design
Received: Jan. 4, 2021
Accepted: --
Published Online: Nov. 2, 2021
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