Design of Compact Catadioptric Cooled Mid-Wavelength Infrared Imaging Optical System

Chenxia Hu; Ying Liu; Chenglong Wang; Guangpeng Zhou; Chen Yu; Boshi Dang

doi:10.3788/AOS231876

Acta Optica Sinica, Volume. 44, Issue 9, 0922002(2024)

Design of Compact Catadioptric Cooled Mid-Wavelength Infrared Imaging Optical System

Chenxia Hu^1,2, Ying Liu^1、*, Chenglong Wang¹, Guangpeng Zhou^1,2, Chen Yu^1,2, and Boshi Dang¹

¹Changchun Institute of Optics, Fine Mechanics, and Physics, Chinese Academy of Sciences, Changchun 130033, Jilin , China

²University of Chinese Academy of Sciences, Beijing 100049, China

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Figures & Tables(19)

Fig. 1. Folding optical system for folding optical path

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Fig. 2. Coaxial folding optical system

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Fig. 3. Structure diagram of Cassegrain reflection system

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Fig. 4. Structure diagram of relay mirror group

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Fig. 5. Curves of absolute values of S_Ⅰ, S_Ⅱ, and T value with α. (a) Absolute value of S_Ⅰ; (b) absolute value of S_Ⅱ; (c) T value

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Fig. 6. Curves of absolute values of S_Ⅰ, S_Ⅱ,and T value with β_sec. (a) Absolute value of S_Ⅰ; (b) absolute value of S_Ⅱ; (c) T value

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Fig. 7. Curves of absolute values of S_Ⅰ, S_Ⅱ, and T value with β_relay. (a) Absolute value of S_Ⅰ; (b) absolute value of S_Ⅱ; (c) T value

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Fig. 8. Cassegrain reflection system. (a) Structure diagram of system; (b) point diagram of system; (c) MTF curve of system

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Fig. 9. Initial optical system structure of folding medium wave infrared imaging

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Fig. 10. Optical system structure of folding medium wave infrared imaging

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Fig. 11. MTF curve of system

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Fig. 12. Point diagram of optical system

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Table 1. Design specifications for optical system

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Table 1. Design specifications for optical system

Design specification	Value
Wavelength /μm	3.7-4.8
Middle wavelength cooled infrared detector	640×512
Pixel size /（μm×μm）	15×15
Effective focal length f ′ /mm	$-$ 600
F-number F^#	2
Field of view ω /（°）	±0.573
Aperture D /mm	>300

Table 2. Influence of α on S_Ⅰ, S_Ⅱ, and T value
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Table 2. Influence of α on S_Ⅰ, S_Ⅱ, and T value
$α$ $S_{Ⅰ}$ $S_{Ⅱ}$ $T$
0.20 $-$ 2.2792 0.9696 279.6
0.25 $-$ 2.3434 0.9076 339.6
0.30 $-$ 2.4104 0.8454 399.6
0.35 $-$ 2.4801 0.7831 459.6
0.40 $-$ 2.5522 0.7207 519.6

Table 3. Influence of β_sec on S_Ⅰ, S_Ⅱ, and T value
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Table 3. Influence of β_sec on S_Ⅰ, S_Ⅱ, and T value
$β_{s e c}$ $S_{Ⅰ}$ $S_{Ⅱ}$ $T$
$-$ 2.0 $-$ 1.0010 0.9480 279.6
$-$ 2.5 $-$ 1.5398 0.9562 279.6
$-$ 3.0 $-$ 2.2792 0.9696 279.6
$-$ 3.5 $-$ 3.2492 0.9882 279.6
$-$ 4.0 $-$ 4.4801 1.0119 279.6

Table 4. Influence of β_relay on S_Ⅰ, S_Ⅱ, and T value
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Table 4. Influence of β_relay on S_Ⅰ, S_Ⅱ, and T value
$β_{r e l a y}$ $S_{Ⅰ}$ $S_{Ⅱ}$ $T$
$-$ 0.9 $-$ 10.9145 3.1268 155.33
$-$ 0.8 $-$ 7.8121 2.4719 174.75
$-$ 0.7 $-$ 5.3959 1.8941 199.71
$-$ 0.6 $-$ 3.5802 1.3933 233.00
$-$ 0.5 $-$ 2.2792 0.9696 279.60

Table 5. Predetermined tolerance of optical system
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Table 5. Predetermined tolerance of optical system
Parameter of tolerance Predetermined value
Thickness /mm 0.02
Tilt of element /（′） 1
Decenter of element /mm 0.02
Decenter of surface /mm 0.02
N 2
ΔN 0.3
Index 0.001
Abbe 0.8

Table 6. Adjustment of sensitive tolerance
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Table 6. Adjustment of sensitive tolerance
Parameter of tolerance Element Adjust value
N Primary mirror 1.5
Rear surface of lens 4 in relay mirror
Decenter of element /mm Two surfaces of lens 4 in relay mirror 0.01
ΔN Primary mirror 0.25

Table 7. Mente Carlo statistical analysis results
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Table 7. Mente Carlo statistical analysis results
Sample percentage /% MTF value
98 0.22
90 0.31
50 0.41

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Chenxia Hu, Ying Liu, Chenglong Wang, Guangpeng Zhou, Chen Yu, Boshi Dang. Design of Compact Catadioptric Cooled Mid-Wavelength Infrared Imaging Optical System[J]. Acta Optica Sinica, 2024, 44(9): 0922002

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