Infrared and Laser Engineering, Volume. 53, Issue 4, 20230722(2024)
Miniaturization analysis and design of the common-optical path dual-wave infrared optical lens
Figures & Tables(12)
Fig. 4. Detailed layout diagram of dual band infrared optical system with common optical path
Fig. 5. MTF of medium-wave infrared (a) and MTF of long-wave infrared
Fig. 8. Medium wave MTF at room temperature. (a) MTF after tolerance data input; (b) MTF after focal plane compensation
Table 1. Optical properties of several infrared materials
View tableView in ArticleTable 1. Optical properties of several infrared materials
Materials $ {\mathit{N}}_{\mathit{f}} $ $ {\mathit{N}}_{\mathit{d}} $ $ {\mathit{N}}_{\mathit{c}} $ $ {\mathit{P}}_{\mathit{d}} $ $ {\mathit{V}}_{\mathit{d}} $ d=4.8 μm d=7.7 μm d=4.8 μm d=7.7 μm d=4.8 μm d=7.7 μm IRG201 2.513855 2.510236 2.502922 2.497732 0.224495 0.678092 93.66783 93.21424 IRG202 2.511224 2.507694 2.500724 2.495913 0.23056 0.685739 98.46816 98.01298 IRG203 2.607391 2.603005 2.594223 2.588077 0.227079 0.681755 82.9957 82.54102 IRG204 2.786165 2.781418 2.773711 2.769073 0.277744 0.728621 104.2225 103.7716 IRG205 2.62355 2.619273 2.610849 2.605094 0.231726 0.688172 87.73343 87.27698 IRG206 2.796253 2.791509 2.783922 2.779417 0.281747 0.732413 106.4065 105.9559 IRG207 2.623095 2.619482 2.613569 2.609976 0.27538 0.726078 123.4498 122.9991 IRG208 2.418159 2.413559 2.40087 2.390473 0.166146 0.624467 51.05802 50.59969 IRG209 3.165434 3.15623 3.1459 3.141838 0.390086 0.827866 91.37959 90.94181 Germanium 4.029211 4.017606 4.007251 4.004855 0.476502 0.901649 123.8955 123.4703 ZnSe 2.434334 2.430243 2.418698 2.409392 0.164017 0.626893 57.34287 56.88 ZnS 2.254125 2.247816 2.22558 2.206207 0.13165 0.595696 26.04061 25.57656
Table 2. Design parameters of the optical system
View tableView in ArticleTable 2. Design parameters of the optical system
Index Parameter Working band/μm 3.7-4.8 7.7-9.5 F-number 2 Focal length/mm 100 Field of view >6°×7° Efficiency of cold diaphragm 100% Temperature/℃ −40-60 Size of area array 640×512 Pixel/μm 20 Distance form cold diaphragm to detector/mm 19.7
Table 3. MTF of optical system
View tableView in ArticleTable 3. MTF of optical system
MTF On the optical axis 25 lp/mm 0.7 field of view 25 lp/mm Full field of view 25 lp/mm 20 ℃ 3.7-4.8 μm 0.62 0.47 0.48 7.7-9.5 μm 0.41 0.27 0.25 −40 ℃ 3.7-4.8 μm 0.58 0.42 0.48 7.7-9.5 μm 0.41 0.26 0.28 60 ℃ 3.7-4.8 μm 0.51 0.51 0.42 7.7-9.5 μm 0.42 0.30 0.28
Table 4. Measurement tolerance data of optical systems
View tableView in ArticleTable 4. Measurement tolerance data of optical systems
Surface Radius/mm Thickness/mm Surface tilt/(°) 1 −0.032 −0.035 0.0007 2 0.003 −0.024 3 0.004 0.002 0.00562 4 −0.231 −0.066 5 −0.036 0.015 0.000504 6 0.026 0.001 7 0.002 0.016 0.0146 8 0.002 −0.086 9 −0.005 −0.006 0.00441 10 −0.001 0.038222 11 0.006 0.035 0.00584 12 0.031 0.022
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Chen Qi, Yangming Jin, Xiaoyu Xie, Huihui Hou, Yongsheng Li. Miniaturization analysis and design of the common-optical path dual-wave infrared optical lens[J]. Infrared and Laser Engineering, 2024, 53(4): 20230722
Paper Information
Category: Optical design
Received: Dec. 27, 2023
Accepted: --
Published Online: Jun. 21, 2024
The Author Email: Jin Yangming (jym_good@126.com)
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