Infrared and Laser Engineering, Volume. 53, Issue 8, 20240189(2024)
Method of stray light suppression for annular folded aperture imaging system
Figures & Tables(15)
Fig. 1. Paraxial folded manner of annular aperture imaging system. (a) Refraction structure; (b) Paraxial annular aperture of reflective structure
Fig. 2. Light collection of different reflection times for annular folded aperture imaging system
Fig. 7. The relationship between lens hood length and field of view
Fig. 9. Layout of stray light for the annular aperture imaging system without the light shield
Fig. 11. Layout of stray light for the annular aperture imaging system with the light shield
Fig. 13. Comparison of the PST curves before and after stray light optimization
Table 1. Design index of annular aperture imaging system
View tableView in ArticleTable 1. Design index of annular aperture imaging system
Parameter Value Effective focal length/mm 60 Effective F# 1.4 Wavelength/μm 7.7-10 Pixel size 12 μm×12 μm Detector size 7.68 mm×7.68 mm Field of view (2ω)/(°) 9.8 Lens thickness/mm ≤19
Table 2. The PST values of the key angles
View tableView in ArticleTable 2. The PST values of the key angles
Angle/(°) Infrared PST Before optimization After optimization 9 0.052916 1.20424 E-0410 0.034319 3.40796 E-0413 0.039033 3.15205 E-0521 0.000962 8.21207 E-0630 0.008687 1.97150 E-0633 0.007122 1.30376 E-0634 0.005842 1.59683 E-0635 0.004057 8.79987 E-0749 0.004001 1.60951 E-07
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Yuanming ZHAO, Bo ZHANG, Chengran ZHANG, Yafeng XIE, Qun NIU, Jinli TANG. Method of stray light suppression for annular folded aperture imaging system[J]. Infrared and Laser Engineering, 2024, 53(8): 20240189
Paper Information
Category: Optical design
Received: May. 6, 2024
Accepted: --
Published Online: Oct. 29, 2024
The Author Email: ZHANG Bo (zhangboyiran@163.com)
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