Design and Performance Analysis of Small Size Iris Recognition Lens

Guimei Wei; Kai Zhang; Xiongping Xia

doi:10.3788/LOP232344

Laser & Optoelectronics Progress, Volume. 61, Issue 17, 1722002(2024)

Design and Performance Analysis of Small Size Iris Recognition Lens

Guimei Wei, Kai Zhang, and Xiongping Xia^*

Author Affiliations

College of Science, Guilin University of Technology, Guilin 541004, Guangxi, China

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Figures & Tables(12)

Fig. 1. Structure of lens system

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Fig. 2. MTF plots for different working distances after optimization. (a) Working distance is 184 mm; (b) working distance is 389 mm

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Fig. 3. Spot diagrams for different working distances of lens. (a) Working distance is 184 mm; (b) working distance is 389 mm

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Fig. 4. Field curvature and distortion diagram of lens at different working distances. (a) Working distance is 184 mm; (b) working distance is 389 mm

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Fig. 5. Relative illumination of lens at different working distances. (a) Working distance is 184 mm; (b) working distance is 389 mm

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Fig. 6. Thermal analysis of lenses with working distance of 184 mm.(a) Working temperature is -40 ℃, no temperature compensation; (b) working temperature is -40 ℃, after temperature compensation; (c) working temperature is 80 ℃, no temperature compensation; (d) working temperature is 80 ℃, after temperature compensation

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Fig. 7. Thermal analysis of lenses with working distance of 389 mm. (a) Working temperature is -40 ℃, no temperature compensation; (b) working temperature is -40 ℃, after temperature compensation; (c) working temperature is 80 ℃, no temperature compensation; (d) working temperature is 80 ℃, after temperature compensation

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Table 1. Parameters of sensor
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Table 1. Parameters of sensor
Item Parameter
Effective pixel number /（pixel×pixel） 1920×1080
Image size /（μm×μm） 2688×1512
Min pixel size /（μm×μm） 1.4×1.4
Image height /mm 3.08

Table 2. Main technical parameters of iris recognition lens
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Table 2. Main technical parameters of iris recognition lens
Item Specification
Wavelength /nm 832‒872
Field of view /（°） 42
f-number 1.8
Total length /mm <3.00
MTF of all fields /（lp/mm） >0.3
Distortion /% <1
Relative illumination /% >60

Table 3. Optical system initial data

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Table 3. Optical system initial data

Surface	Type	Radius	Thickness	Glass
OBJ	Standard	Infinity	Infinity	‒
1	Even Asphere	1.09518	0.50583	E48R
2	Even Asphere	2.65499	0.09308	‒
STO	Standard	Infinity	0.07252	‒
4	Even Asphere	2.32924	0.34967	EP5000
5	Even Asphere	1.73577	0.29750	‒
6	Even Asphere	-4.10533	0.59023	E48R
7	Even Asphere	-2.41390	0.51719	‒
8	Even Asphere	-7.48770	0.55331	E48R
9	Even Asphere	3.37403	0.2	‒
10	Standard	Infinity	0.21	BK7
11	Standard	Infinity	0.7	‒
IMA	Standard	Infinity	‒	‒

Table 4. Optical system parameters
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Table 4. Optical system parameters
Type Value
Radius /mm 0.005
Thickness /mm 0.005
Decenter /mm 0.003
Tilt /mm 0.005
S+A Irreg 0.1
Abbe /% 1

Table 5. Monte Carlo analysis of datas
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Table 5. Monte Carlo analysis of datas
Monte Carlo tolerance /% MTF value
90 >0.15628598
80 >0.17451953
50 >0.20469711
20 >0.23800431
10 >0.24983709

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Guimei Wei, Kai Zhang, Xiongping Xia. Design and Performance Analysis of Small Size Iris Recognition Lens[J]. Laser & Optoelectronics Progress, 2024, 61(17): 1722002

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