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

Journals >Acta Optica Sinica >Volume 44 >Issue 9 >Page 0922002 > Article

Acta Optica Sinica
Vol. 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

Author Affiliations

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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DOI: 10.3788/AOS231876 Cite this Article Set citation alerts

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 Copy Citation Text

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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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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 1. Design specifications for optical system

$α$	$S_{Ⅰ}$	$S_{Ⅱ}$	$T$
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 2. Influence of α 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 3. Influence of β_sec 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 4. Influence of β_relay on S_Ⅰ, S_Ⅱ, and T value

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 5. Predetermined tolerance of optical system

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

Table 6. Adjustment of sensitive tolerance

Sample percentage /%	MTF value
98	0.22
90	0.31
50	0.41

Table 7. Mente Carlo statistical analysis results

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