Infrared and Laser Engineering, Volume. 52, Issue 12, 20230297(2023)
Design of two-color cold infrared optical system
Figures & Tables(23)
Fig. 4. The relationship between background radiation and temperature variation
Fig. 11. Encircled energy diagram of long-wavelength infrared system
Table 1. Design parameters of infrared optical system
View tableView in ArticleTable 1. Design parameters of infrared optical system
Parameter Value Medium wavelength/μm 3.7-4.8 Long wavelength/μm 7.9-9.3 Focal length/mm 72 F number 1.2 Field angle of MWIR/(°) $> 10.1\times 10.1$ Field angle of LWIR/(°) $> 5.1\times 5.1$ Pixel size/μm2 25×25
Table 2. Property parameters of infrared materials
View tableView in ArticleTable 2. Property parameters of infrared materials
Infrared material Transmission wavelength/μm dn/dt Si 1.1-9 0.00015 Ge 1.8-12 0.000396 ZnS 0.37-14 0.000035 ZnSe 0.5-22 0.00006 CaF2 0.13-10 −0.000011
Table 3. Analysis results of the narcissus effect of medium-wavelength infrared system
View tableView in ArticleTable 3. Analysis results of the narcissus effect of medium-wavelength infrared system
Surface YNI I/Ibar 1 12.54 −3.42 2 −2.23 −3.14 3 1.94 −1.77 4 −7.88 −1.48 5 −6.66 −0.80 6 3.67 −0.59 7 2.17 12.03 8 −0.90 12.36 9 6.78 7.98 10 −3.05 6.31 11 −2.00 3.79 12 2.43 2.63
Table 4. Analysis results of the narcissus effect of long-wavelength infrared system
View tableView in ArticleTable 4. Analysis results of the narcissus effect of long-wavelength infrared system
Surface YNI I/Ibar 1 12.54 −3.98 2 −2.17 −3.67 3 2.01 −2.23 4 −7.79 −1.91 5 −6.59 −1.16 6 3.74 −0.93 7 2.61 14.15 8 −1.59 14.57 9 7.77 13.37 10 −3.53 11.18 11 −3.06 8.23 12 −0.51 6.84
Table 5. Preset tolerance value
View tableView in ArticleTable 5. Preset tolerance value
Parameter Conic Tilt/ (″) Decenter/ mm Thickness/ mm Radius/ mm Splitter plate ±0.001 ±60 ±0.02 ±0.02 $ \pm 0.05 $ Mirror ±0.001 ±60 ±0.02 ±0.02 $ \pm 0.05 $ Lens ±0.001 ±45 ±0.02 ±0.02 $ \pm 0.05 $ Compensating mirror ±0.001 ±45 ±0.05 ±0.02 $ \pm 0.05 $
Table 6. Analysis results of encircled energy tolerance for medium-wavelength system
View tableView in ArticleTable 6. Analysis results of encircled energy tolerance for medium-wavelength system
Field Design value of encircled energy Tolerance value of encircled energy （0, 0） 10.43 11.11 （6.34, 0） 10.41 11.06 （0, 5.08） 10.04 10.95 （6.34, 5.08） 11.37 12.47 （4.43, 0） 9.86 10.53 （0, 3.5） 10.15 11.21 （4.43, 3.5） 10.24 11.49
Table 7. Analysis results of encircled energy tolerance for long-wavelength system
View tableView in ArticleTable 7. Analysis results of encircled energy tolerance for long-wavelength system
Field Design value of encircled energy Tolerance value of encircled energy （0, 0） 12.72 13.61 （6.34, 0） 11.55 13.30 （0, 5.08） 11.87 13.54 （6.34, 5.08） 14.69 16.10 （4.43, 0） 12.35 15.17 （0, 3.5） 13.10 14.21 （4.43, 3.5） 13.11 14.65
Table 8. Experimental data
View tableView in ArticleTable 8. Experimental data
Parameter MDTD NETD Measured value of MWIR 210 mK 22 mK Corresponding distance 6422 km Pre-cooling measured value of LWIR 323 mK 28 mK Corresponding distance 20.81 km After cooling measured value of LWIR 192 mK 18 mK Corresponding distance 31.16 km
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Chenfeng Wang, Xiaowei Wang, Weiguo Lu. Design of two-color cold infrared optical system[J]. Infrared and Laser Engineering, 2023, 52(12): 20230297
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Received: May. 13, 2023
Accepted: --
Published Online: Feb. 23, 2024
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