Design of a Long-wave Infrared Medical Endoscope Optical System with 30° Viewing Angle

Duoyao WANG; Wenlong LI; Qianlong XIE; Chengrun LI; Hongxu YUE; Rui YAN; Depeng KONG

doi:10.3788/gzxb20255408.0822002

Acta Photonica Sinica, Volume. 54, Issue 8, 0822002(2025)

Design of a Long-wave Infrared Medical Endoscope Optical System with 30° Viewing Angle

Duoyao WANG^1,2,3, Wenlong LI^1,2、**, Qianlong XIE^3,4, Chengrun LI⁵, Hongxu YUE⁵, Rui YAN⁵, and Depeng KONG^1,2、*

¹State Key Laboratory of Ultrafast Optical Science and Technology， Xi'an Institute of Optics and Precision Mechanics， Chinese Academy of Sciences， Xi'an 710119， China

²Photonics Functional Materials and Devices Research Laboratory， Xi'an Institute of Optics and Precision Mechanics， Chinese Academy of Sciences， Xi'an 710119， China

³School of Optoelectronics， University of Chinese Academy of Sciences， Beijing 101408， China

⁴Key Laboratory of Spectral Imaging Technology， Xi'an Institute of Optics and Precision Mechanics of CAS， Xi'an 710119，China

⁵Department of Thoracic Surgery， Chinese People's Liberation Army General Hospital， Beijing 100853， China

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Figures & Tables(13)

Fig. 1. Objective lens module

Fig. 2. Relay module

Fig. 3. Coupled mirror module

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Fig. 4. Structure of endoscope system

Fig. 5. MTF curve

Fig. 6. Spot diagram

Fig. 7. Relative illumination

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Fig. 8. Field curvature and distortion diagram

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Fig. 9. MTF curves under different temperature conditions

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Fig. 10. MTF curves under different temperature conditions after thermal compensation

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Table 1. Design parameters of the endoscope system

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Table 1. Design parameters of the endoscope system

Parameter	Value
F/#	1.39
View angle/（°）	30°
Working wavelength/μm	8~14
Field of view/（°）	±19.4°
Working distance/mm	100
Insertion length/mm	≥200
Total length/mm	≤300
Diameter/mm	≤9
Back focal length/mm	≥25
NETD/mK	45

Table 2. Tolerance limit value
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Table 2. Tolerance limit value
Item Value
TFRN/rings 3
TTHI/mm 0.015
TSDX/mm 0.015
TSDY/mm 0.015
TEDX/mm 0.015
TEDY/mm 0.015
TSTX/（°） 0.015
TSDY/（°） 0.015
TETX/（°） 0.015
TETY/（°） 0.015
Refractive index 0.000 3
Abbe-number 0.5

Table 3. Monte Carlo analysis results
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Table 3. Monte Carlo analysis results
Percentage/% The value of MTF at 41.7 lp/mm
>98% 0.198 216 83
>90% 0.209 607 76
>80% 0.214 554 22
>50% 0.222 371 36
>20% 0.228 607 66

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Duoyao WANG, Wenlong LI, Qianlong XIE, Chengrun LI, Hongxu YUE, Rui YAN, Depeng KONG. Design of a Long-wave Infrared Medical Endoscope Optical System with 30° Viewing Angle[J]. Acta Photonica Sinica, 2025, 54(8): 0822002

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