Acta Optica Sinica, Volume. 44, Issue 7, 0722002(2024)
Athermalization Design of Uncooled Long Waveband Infrared Continuous Zoom Optical System
Figures & Tables(13)
Fig. 2. Two-dimensional structure diagram of zoom optical system. (a) f '=60 mm; (b) f '=120 mm; (c) f '=180 mm
Fig. 3. MTF of optical system at different temperatures with different focal lengths. (a1)-(a3) f '=60 mm, T=
Fig. 4. Field curvature and distortion diagrams of optical system at different temperatures with different focal lengths. (a1)-(a3) f '=60 mm, T=
Fig. 5. Fraction of enclosed energy of zoom optical system with different focal lengths. (a) f '=60 mm; (b) f '=120 mm; (c) f '=180 mm
Table 1. Design index of zoom optical system
View tableTable 1. Design index of zoom optical system
System Parameter Index Zoom opticalsystem Working waveband /µm 8 - 12Field of view /（°） 3.6 - 10.8Effective focal length （EFL） /mm 60 - 180F-number 2 MTF@20 lp/mm >0.3 Distortion /% <2 Infrared detector Number of pixel arrays 320×320 Pixel size /（µm×µm） 25×25
Table 2. Lens data of zoom optical system
View tableTable 2. Lens data of zoom optical system
Surface Type Radius of curvature Thickness Glass Object Standard Infinity Infinity — 1 Standard 107.933 10.276 ZnSe 2 Standard 289.649 1.000 — 3 Standard 283.193 10.992 ZnS 4 Standard 143.846 4.662 — 5 Even asphere 34.665 4.430 Ge 6 Standard 30.647 11.297 — 7 Standard 184.574 3.003 IRG24 8 Even asphere 62.939 68.180 — 9 Even asphere 94.595 3.361 Ge 10 Standard 2584.285 3.699 — Stop Standard Infinity 1.790 — 12 Even asphere 189.861 3.997 Ge 13 Standard 523.850 32.531 — 14 Even asphere 211.333 3.000 Ge 15 Standard 546.132 38.831 Image Standard Infinity — —
Table 3. Parameters of aspheric surface
View tableTable 3. Parameters of aspheric surface
Surface No. Conic 4th order term 6th order term 8th order term 10th order term 5 0.286 4.178×10-7 1.711×10-10 1.479×10-12 2.902×10-15 8 0.029 2.249×10-6 1.540×10-9 3.986×10-12 1.594×10-14 9 1.797 9.198×10-8 4.067×10-10 3.150×10-14 7.792×10-17 12 9.827 4.380×10-7 1.732×10-10 3.776×10-12 6.915×10-15 14 0 5.821×10-7 1.049×10-8 5.962×10-11 1.293×10-13
Table 4. Image thermal defocus
View tableTable 4. Image thermal defocus
Focal length -40 ℃ 20 ℃ 60 ℃ Short 13.1 3 6 Middle 0 9 11 Long 3 5 0
Table 5. Tolerance settings of system
View tableTable 5. Tolerance settings of system
Tolerance type Value Refractive index 0.0008 Curvature radius /fringe 2 Surface irregularity /fringe 0.25 Thickness /mm ±0.025 Abbe number /% 0.08 Element decenter /mm ±0.008 Element tilt /（′） 0.8 Test wavelength /µm 10
Table 6. Tolerance analysis results
View tableTable 6. Tolerance analysis results
Yield rate /% MTF of short focal length > MTF of middle focal length > MTF of long focal length > 90 0.339 0.333 0.336 80 0.351 0.345 0.350 50 0.374 0.369 0.371 20 0.392 0.392 0.394 10 0.403 0.404 0.405
Tools
Get Citation
Copy Citation Text
Yufeng Tang, Shan Mao, Yichen Song, Tao Lai, Peiqi Yuan, Xiaowei Ding, Jianlin Zhao. Athermalization Design of Uncooled Long Waveband Infrared Continuous Zoom Optical System[J]. Acta Optica Sinica, 2024, 44(7): 0722002
Paper Information
Category: Optical Design and Fabrication
Received: Dec. 12, 2023
Accepted: Jan. 25, 2024
Published Online: Apr. 11, 2024
The Author Email: Mao Shan (maoshan_optics@nwpu.edu.cn)
CSTR:32393.14.AOS231922
© Copyright 2018-2021 | Chinese Laser Press.
All Rights Reserved 沪ICP备15018463号-20