Infrared and Laser Engineering, Volume. 52, Issue 10, 20230266(2023)
Non-symmetrical five-sided mirrors based single viewpoint catadioptric infrared omnidirectional imaging system
Figures & Tables(16)
![Prototypes and structural diagrams of single-viewpoint constraint catadioptric omnidirectional imaging systems based on symmetrical multi-sided mirrors[9]](/Images/icon/loading.gif){kind=icon}
Fig. 1. Prototypes and structural diagrams of single-viewpoint constraint catadioptric omnidirectional imaging systems based on symmetrical multi-sided mirrors[9]
Fig. 2. Single-viewpoint constraint with symmetrical five-sided mirrors. (a) Symmetrical five-sided mirrors; (b) Orthograph of adjacent mirrors
Fig. 3. Aperture-divided and multi-viewpoint omnidirectional imaging system[10]
Fig. 4. Calculation results. (a) Detection distance of infrared lenses with focal lengths of 4.1 mm, 5.8 mm and 9.1 mm at 50% detection probability; (b) Horizontal FOV of infrared lenses with focal lengths of 4.1 mm, 5.8 mm and 9.1 mm
Fig. 6. Geometric structure diagram of non-symmetrical five-sided mirrors
Fig. 7. Definition of structural parameters for non-symmetrical five-sided mirrors structure. (a) 3D diagram; (b) 2D diagram of side projection
Fig. 9. Flowchart of designing non-symmetrical five-sided mirrors structure
Fig. 10. Conversion from planar projection to omnidirectional image. (a) Planar images in five directions; (b) Omnidirectional image after cylindrical projection
Table 1. Specifications of infrared imaging modules for the designed system
View tableView in ArticleTable 1. Specifications of infrared imaging modules for the designed system
ModuleⅠ×3 Module Ⅱ×2 Spectral range 8-12 μm Array format $640 \times 512$ Pixel size 12 μm NETD 40 mK @25 ℃ Lens focal length 5.8 mm (f1) 4.1 mm (f2) ${{HFOV} } \times {{VFOV} }$ $70^\circ \times 57.7^\circ $ $89.8^\circ \times 75.7^\circ $ Lens diameter 55 mm 43 mm Non-Uniformity Correction (NUC) Shutterless NUC
Table 2. Structural parameters of non-symmetrical five-sided mirrors
View tableView in ArticleTable 2. Structural parameters of non-symmetrical five-sided mirrors
Parameters Mirror inclination θ Virtual viewpoint height m Bottom distance d Tailorable mirror height s Viewpoint height h Horizontal distance between the viewpoint and the vertex l Vertical field of view $2\varepsilon $ Lens diameter k
Table 3. Theoretical and practical values of structure parameters in the proposed system
View tableView in ArticleTable 3. Theoretical and practical values of structure parameters in the proposed system
Theoretical values Actual values Forward and lateral view Mirror inclination θ 48.15° Bottom distance d 26.23 cm Vertical field of view 2ε 60° 57.7° Horizontal distance between the viewpoint and the vertex l 9.95 cm 11.62 cm Viewpoint height h 1.1 cm 1.28 cm Rear view Mirror inclination θ 51.9° Bottom distance d 22.97 cm Vertical field of view 2ε 76° 62.36° Horizontal distance between the viewpoint and the vertex l 9.73 cm 11.29 cm Viewpoint height h 2.39 cm 2.77 cm Virtual viewpoint height m 19.27 cm 17.6 cm Tailorable mirror height s 7.19 cm 9.22 cm
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Yunyang Zhou, Yuzhen Wu, Lingxue Wang, Ningtao Rong, Hongbing Li, Yiting Gu, Fengmei Cao, Yi Cai. Non-symmetrical five-sided mirrors based single viewpoint catadioptric infrared omnidirectional imaging system[J]. Infrared and Laser Engineering, 2023, 52(10): 20230266
Paper Information
Category: Infrared technology and application
Received: May. 4, 2023
Accepted: --
Published Online: Nov. 21, 2023
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