Design of Optical System for Nasal Mucociliary Microendoscope

Xin Wang; Yang Xiang; Dawei Feng; Kaiming Yang; Chuan Pang; Lei Chen

doi:10.3788/AOS221613

Acta Optica Sinica, Volume. 43, Issue 4, 0417001(2023)

Design of Optical System for Nasal Mucociliary Microendoscope

Xin Wang^1、aff, Yang Xiang^1、*, Dawei Feng^1、aff, Kaiming Yang^1、aff, Chuan Pang^2,3、affaff, and Lei Chen^2,3、affaff

Author Affiliations

¹School of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun 130022, Jilin, China

²Department of Otorhinolaryngology Head and Neck Surgery, Chinese PLA General Hospital, Beijing 100039, China

³National Clinical Medical Research Center for Otorhinolaryngology, Beijing 100039, China

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Figures & Tables(14)

Fig. 1. Structure diagrams of the prism viewing direction. (a) Front view of the prism viewing direction; (b) right view of the prism viewing direction

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Fig. 2. Optical structure of endoscope objective lens

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Fig. 3. Optical structure of a single set of rod mirrors

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Fig. 4. Optical structure of eyepiece system

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Fig. 5. Optical structure of multiplication adapter system. (a) Short focal; (b) medium focal; (c) long focal

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Fig. 6. Schematic of microscopic objective

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Fig. 7. Structure diagrams of equivalent microscopic objective. (a) Short focal; (b) medium focal; (c) long focal

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Fig. 8. Overall optimization structure diagrams. (a) Combination of objective lens system and relay system; (b) rear short focal structure; (c) rear medium focal structure; (d) rear long focal structure

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Fig. 9. MTF curves. (a) Short focal MTF; (b) medium focal MTF; (c) long focal MTF

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Fig. 10. Spot diagrams. (a) Short focal spot diagram; (b) medium focal spot diagram; (c) long focal spot diagram

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Fig. 11. Field curvature and distortion diagrams. (a) Short focal field curvature and distortion diagram; (b) medium focal field curvature and distortion diagram; (c) long focal field curvature and distortion diagram

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Table 1. Design requirements of rigid endoscope objective
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Table 1. Design requirements of rigid endoscope objective
System parameter Value
Angle of view $θ$ /（°） 30
Field of view 2y /mm 0.40
Square numerical aperture NA 0.15
Lens diameter C /mm <5.00
Working distance d /mm 3.00
Wavelength $λ$ /nm 486-656
Magnification $2 \times^{}$

Table 2. Tolerance value

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Table 2. Tolerance value

Tolerance	Range
Radius	2 rings
Thickness	0.0375
X direction surface parallel eccentricity	0.01
Y direction surface parallel eccentricity	0.01
X direction element parallel eccentricity	0.01
Y direction element parallel eccentricity	0.01
X direction surface tilt eccentricity	0.016°
Y direction surface tilt eccentricity	0.016°
X direction element tilt eccentricity	0.016°
Y direction element tilt eccentricity	0.016°
Refractive index	0.001
Abbe number	0.1
Degree of irregularity	0.5

Table 3. Tolerance analysis results

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Table 3. Tolerance analysis results

Probability /%	Short focal MTF threshold	Medium focal MTF threshold	Long focal MTF threshold
90	≥0.24112795	≥0.24939491	≥0.25553497
80	≥0.26500962	≥0.27334284	≥0.27568140
50	≥0.31212522	≥0.31387543	≥0.31762968
20	≥0.34402264	≥0.34406522	≥0.34734586
10	≥0.35464655	≥0.36532988	≥0.36915205

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Xin Wang, Yang Xiang, Dawei Feng, Kaiming Yang, Chuan Pang, Lei Chen. Design of Optical System for Nasal Mucociliary Microendoscope[J]. Acta Optica Sinica, 2023, 43(4): 0417001

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