Design of Objective Lens and Realization of Monitoring System Based on Fiber Bundles

Jian Tang; Yi Huang; Chuanlu Deng; Chengyong Hu; Qi Zhang; Jinlong Li; Xiaobei Zhang; Tingyun Wang

doi:10.3788/LOP220736

Laser & Optoelectronics Progress, Volume. 60, Issue 7, 0722001(2023)

Design of Objective Lens and Realization of Monitoring System Based on Fiber Bundles

Jian Tang¹, Yi Huang¹, Chuanlu Deng¹, Chengyong Hu¹, Qi Zhang¹, Jinlong Li², Xiaobei Zhang^1、*, and Tingyun Wang¹

¹Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication, School of Communication & Information Engineering, Shanghai University, Shanghai 200444, China

²Shanghai Institute of Measurement and Testing Technology, Shanghai 200233, China

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Figures & Tables(15)

Fig. 1. Schematic diagram of the fiber bundles monitoring system

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Fig. 2. Fiber bundles of rectangular cross-section. (a) End face of fiber bundles; (b) one hundred×under microscope enlarged image of fiber bundle end face observed; (c) five hundred×under microscope enlarged image of fiber bundle end face observed

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Fig. 3. Optical path structure of objective lens

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Fig. 4. Evaluation index of objective lens. (a) MTF curve; (b) relative illumination curve; (c) chromatic focal curve; (d) encircled energy curve; (e) geometric spot diagrams

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Fig. 5. Interior structure and physical diagram of objective lens. (a) Sectional view; (b) physical diagram

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Fig. 6. Relative illumination test and CRA curve. (a) Relative illumination test curve; (b) CRA curve

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Fig. 7. Comparison diagrams of MTF simulation and test. (a) 0°; (b) 12°; (c) 25.5°; (d) 38.7°

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Fig. 8. Construction of fiber bundles monitoring system. (a) Fiber bundles monitoring system; (b) front imaging module; (c) post conversion module

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Fig. 9. Test result of fiber bundles monitoring system. (a) Vector graph of test card; (b) resulting image of system; (c) test image of TV line; (d) pixelated image; (e) depixelated image

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Fig. 10. Radiated immunity test. (a) Horn antenna; (b) without interference transmission; (c) with interference transmission

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Table 1. Design requirements of objective lens
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Table 1. Design requirements of objective lens
Parameter Value
Wavelength /nm 486，587，656
Image size /mm 8
Angle of view /（°） 76
Relative illuminance >0.8
Telecentricity /（°） <1
F number 4
MTF at 36 lp/mm >0.8
NA <0.6

Table 2. Structural parameters of objective lens

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Table 2. Structural parameters of objective lens

Surface	Radius /mm	Thickness /mm	Material	Semidiameter /mm
OBJ	Infinity	1000.000	-	790.493
1	38.566	1.000	H-LAF3B	9.113
2	11.450	3.322	-	7.646
3	Infinity	1.000	H-LAF3B	7.533
4	17.550	9.859	-	7.129
5	-23.920	3.000	H-LAK4L	7.439
6	-14.552	9.449	-	7.736
7	13.060	2.600	H-ZBAF50	5.800
8	Infinity	8.622	-	5.440
STO	Infinity	3.066	-	1.228
10	-5.343	2.160	H-ZF6	2.107
11	14.522	3.000	H-QK3L	3.211
12	-6.685	0.150	-	4.000
13	49.420	2.400	H-LAK4L	4.643
14	-13.060	0.130	-	4.900
15	17.550	1.950	H-LAK4L	5.062
16	Infinity	9.296	-	4.983
IMA	Infinity	-	-	3.983

Table 3. Objective lens tolerance distribution
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Table 3. Objective lens tolerance distribution
Tolerance Value
Radius /fringes 3
Thickness /mm 0.02
S+A Irregularity /fringes 0.3
Decenter /mm 0.02
Tilt /（°） 0.05
Index 0.001
Abbe number 1

Table 4. Distribution of MTF probability
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Table 4. Distribution of MTF probability
Probability /% MTF of objective lens
≥90 0.820
≥80 0.830
≥50 0.843
≥20 0.850
≥10 0.851

Table 5. Comparison of image evaluation index
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Table 5. Comparison of image evaluation index
Quality assessment Original image Processed image
Mean 105.480 106.180
Standard deviation 19.778 21.922
Mean gradient 2.161 9.964

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Jian Tang, Yi Huang, Chuanlu Deng, Chengyong Hu, Qi Zhang, Jinlong Li, Xiaobei Zhang, Tingyun Wang. Design of Objective Lens and Realization of Monitoring System Based on Fiber Bundles[J]. Laser & Optoelectronics Progress, 2023, 60(7): 0722001

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