Infrared and Laser Engineering, Volume. 54, Issue 2, 20240360(2025)
Hybrid athermalization design of LWIR optical system with large field of view
Figures & Tables(18)
Fig. 9. Hybrid passive athermalized at 20 ℃ field curvature with distortion curve
Table 1. Design indicator requirements
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Parameter Value Focal length/mm 40 Wavelength/μm 8-12 Image space F 1 Field of view/(°) 21×17 Operating temperature/℃ −40-65 MTF@42 lp/mm ＞0.3 Detector 1280 ×1024 /12 µm
Table 2. Optical system data diagram
View tableView in ArticleTable 2. Optical system data diagram
Surface type Radius Thickness Material Even asphere 51.081 6.998 ZNSE Standard 17.452 6.359 ZNS_BROAD Even asphere 13.935 3.927 Standard 79.351 6.998 ZNSE Standard 152.124 2.009 Germanium Standard 462.941 3.805 Germanium Even asphere −989.283 11.501 Standard Infinity 1.000 Germanium
Table 3. The amount of displacement of the first lens
View tableView in ArticleTable 3. The amount of displacement of the first lens
Temperature/℃ −40 20 65 Displacement/mm −0.057 0 0.042
Table 4. Tolerance selection table
View tableView in ArticleTable 4. Tolerance selection table
Tolerances Value Radius 1 fringes Thickness 0.01 mm Surface decenter 0.01 mm Surface tilt 1' S+A irregularly 0.25 fringes Element decenter 0.02 mm Element tilt 1' Index 0.0005 Abbe 0.05%
Table 5. −40 ℃ Monte Carlo tolerance analysis results
View tableView in ArticleTable 5. −40 ℃ Monte Carlo tolerance analysis results
Analyze items MTF Percentage MTF Normal 0.424 90%> 0.4228 Best 0.425 80%> 0.4229 Worst 0.421 50%> 0.4237 Mean 0.423 20%> 0.4242 Std dev 0.000 10%> 0.4246
Table 6. 20 ℃ Monte Carlo tolerance analysis results
View tableView in ArticleTable 6. 20 ℃ Monte Carlo tolerance analysis results
Analyze items MTF Percentage MTF Normal 0.434 90%> 0.428 Best 0.437 80%> 0.430 Worst 0.427 50%> 0.434 Mean 0.433 20%> 0.436 Std dev 0.003 10%> 0.437
Table 7. 65 ℃ Monte Carlo tolerance analysis results
View tableView in ArticleTable 7. 65 ℃ Monte Carlo tolerance analysis results
Analyze items MTF Percentage MTF Normal 0.433 90%> 0.429 Best 0.435 80%> 0.430 Worst 0.429 50%> 0.431 Mean 0.431 20%> 0.433 Std dev 0.001 10%> 0.434
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Xin LIU, Jingjin WANG, Qingmei LIU, Zikang JIANG, Zhaopeng XU, Xiaoying LI. Hybrid athermalization design of LWIR optical system with large field of view[J]. Infrared and Laser Engineering, 2025, 54(2): 20240360
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Received: Nov. 1, 2024
Accepted: --
Published Online: Mar. 14, 2025
The Author Email: Xin LIU (20202440@bistu.edu.cn)
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