Design of a real-time fiber-optic infrared imaging system with wide-angle and large depth of field

Xing Peng; Lingbao Kong

doi:10.3788/COL202220.011201

Chinese Optics Letters, Volume. 20, Issue 1, 011201(2022)

Design of a real-time fiber-optic infrared imaging system with wide-angle and large depth of field

Xing Peng and Lingbao Kong^*

Shanghai Engineering Research Center of Ultra-precision Optical Manufacturing, School of Information Science and Technology, Fudan University, Shanghai 200433, China

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Fig. 1. Schematic diagram of the real-time fiber-optic infrared system (RFIS) with a large DOF. OP, objective plane; OL, objective lens; FB, fiber bundle; IF, illuminance fibers; CL, coupling lens; SIC, SWIR camera; DC, display and control.

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$Optical imaging quality evaluation of the RFIS. (a) Cross-sectional schematic of the OL in the RFIS. (b) Diffraction MTF values. (c) Field curvature and distortion plot. (d) Geometric spot diagrams. (e) Relative illuminance (RI) curve. (f) Wavefront map at FOV of 60°.$

Fig. 2. Optical imaging quality evaluation of the RFIS. (a) Cross-sectional schematic of the OL in the RFIS. (b) Diffraction MTF values. (c) Field curvature and distortion plot. (d) Geometric spot diagrams. (e) Relative illuminance (RI) curve. (f) Wavefront map at FOV of 60°.

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$Optical imaging quality evaluation of the RFIS. (a) Cross-sectional schematic of the CL in the RFIS. (b) Diffraction MTF values. (c) Field curvature and distortion plot. (d) Geometric spot diagrams. (e) RI curve. (f) Wavefront map at an FOV of 14.475°.$

Fig. 3. Optical imaging quality evaluation of the RFIS. (a) Cross-sectional schematic of the CL in the RFIS. (b) Diffraction MTF values. (c) Field curvature and distortion plot. (d) Geometric spot diagrams. (e) RI curve. (f) Wavefront map at an FOV of 14.475°.

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Fig. 4. MTF curves of the systems with different WDs for five radial image positions: on-axis, 0.3 field, 0.5 field, 0.707 field, and full field. (a) WD = 8 mm. (b) WD = 15 mm. (c) WD = 25 mm.

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Fig. 5. Optical imaging results for evaluating the imaging quality of the RFIS. (a) The original image is a USAF 1951 resolution board. (b) The simulation image of the RFIS. (c) The undistorted image after computer processing with the distortion correction algorithm of image (b).

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Fig. 6. Tolerance analysis and Monte Carlo analysis. (a) Tolerance analysis results of the OL. (b) The Monte Carlo analysis results of the OL. (c) Tolerance analysis results of the CL. (d) The Monte Carlo analysis results of the CL.

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Fig. 7. Optical imaging results for evaluating the imaging quality of the RFIS. (a) The original image shows the corresponding gross anatomy of the tricuspid valve in a postmortem examination^[21]. (c) The original image shows the tricuspid valve from an autopsy of the right ventricle^[32]. (b) and (d) The undistorted images after computer processing with the distortion correction algorithm of images (a) and (c).

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Table 1. Specification of the OL
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Table 1. Specification of the OL
Item Result
Field of view (°) 120
Focal length (mm) 0.797
Working distance (mm) 10
Half-image height (mm) 1.5
Total track length (mm) 13.32
Relative illumination $> 0.98$
MTF $> 0.8$ at 21 lp/mm

Table 2. Specification of the CL
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Table 2. Specification of the CL
Item Result
Field of view (°) 28.95
Focal length (mm) 4.370
NA in objective space 0.25
Half-image height (mm) 6.15
Relative illumination $> 0.95$
MTF $> 0.661$ at 16.71 lp/mm

Table 3. Tolerance Value of the RFIS

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Table 3. Tolerance Value of the RFIS

Tolerance Item	OL Value	CL Value
Radius (fringe)	$\leq 3$	$\leq 2$
Thickness (mm)	$\pm 0.06$	$\pm 0.05$
Surface decenter (mm)	$\pm 0.04$	$\pm 0.01$
Element tilt (°)	$\pm 0.03$	$\pm 0.02$
Element decenter (mm)	$\pm 0.04$	$\pm 0.03$
Surface irregularity	$\pm 0.2$	$\pm 0.2$
Refractive index	$\pm 0.001$	$\pm 0.001$
Abbe number (%)	$\pm 1$	$\pm 0.8$

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Xing Peng, Lingbao Kong, "Design of a real-time fiber-optic infrared imaging system with wide-angle and large depth of field," Chin. Opt. Lett. 20, 011201 (2022)

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