Laser & Optoelectronics Progress, Volume. 60, Issue 20, 2011002(2023)
Design of a Capsule Endoscope Optical System with a Large Depth of Field
Figures & Tables(15)
Fig. 1. Schematic of capsule endoscope. (a) Overall appearance drawing; (b) internal structure diagram
Fig. 5. Optical system structure diagrams and spot diagrams at different working distance. (a) 7 mm; (b) 20 mm; (c) 50 mm; (d) 100 mm
Fig. 7. Simulated images. (a) 12th unit image of JB/T 9328-1999 A3 resolution board; (b) simulated image of the center field; (c) simulated image of the edge field
Fig. 8. Simulated images. (a) 9th unit image; (b) simulated image of the center field; (c) simulated image of the edge field; (d) 8th unit image; (e) simulated image of the center field; (f) simulated image of the edge field
Fig. 9. MTF curves at different working distance. (a) 7 mm; (b) 20 mm; (c) 50 mm; (d) 100 mm
Table 1. Optimization results with different F numbers
View tableTable 1. Optimization results with different F numbers
F/# MTF（125 lp/mm） Depth of field /mm 4 >0.5 7‒30 5 >0.35 7‒100 6 >0.25 6‒100
Table 2. Parameters of imaging chip
View tableTable 2. Parameters of imaging chip
Optical size /inch Pixel size /（μm×μm） Effective area /（μm×μm） Resolution 1/9 1.4×1.4 1820×1033 1280×720
Table 3. System design parameters
View tableTable 3. System design parameters
Parameter Data Depth of field /mm 7‒100 Field of view /（°） 100 F/# 5 MTF 125 line pairs>0.35
Table 4. Tolerance values of the systems
View tableTable 4. Tolerance values of the systems
Item Value TFRN /fringe 2 TTHI /mm 0.006 TSDY /mm 0.005 TSTY /（°） 0.0167 TEDY /mm 0.005 TETY /（°） 0.005
Table 5. Monte Carlo results of the tolerance analysis
View tableTable 5. Monte Carlo results of the tolerance analysis
Percentage /% The value of MTF at 172 lp/mm 90 > 0.20801540 80 > 0.22677880 50 > 0.26245544 20 > 0.27872328 10 > 0.28508444
Table 6. Most sensitive items of tolerance analysis
View tableTable 6. Most sensitive items of tolerance analysis
Type Surface Value Criterion Change TEDY 9 9 -0.005 0.25053151 -0.05128430 TEDY 9 9 0.005 0.25053151 -0.05128430 TEDY 10 10 0.005 0.25432082 -0.04749499 TEDY 10 10 -0.005 0.25432082 -0.04749499 TEDY 11 11 -0.005 0.25969552 -0.04212030 TEDY 11 11 0.005 0.25969552 -0.04212030 TEDY 8 8 0.005 0.26965158 -0.03216423 TEDY 8 8 -0.005 0.26965158 -0.03216423 TFRN 10 -2 0.27928139 -0.02253443 TEDY 6 6 0.005 0.28033010 -0.02148572
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Jiegen Yang, Feng Hu, Wei Ding, Liner Zou. Design of a Capsule Endoscope Optical System with a Large Depth of Field[J]. Laser & Optoelectronics Progress, 2023, 60(20): 2011002
Paper Information
Category: Imaging Systems
Received: Sep. 21, 2022
Accepted: Dec. 12, 2022
Published Online: Oct. 13, 2023
The Author Email: Liner Zou (Linerzou@ncu.edu.cn)
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