Designing Optical Systems for Close-Distance Vehicle Lenses in Target Recognition

Parameter	Value
Focal length /mm	6
Entrance diameter /mm	1.76454
Half field of view /（°）	25
Spectral range /μm	0.486‒0.656
Relative distortion /%	<0.5
Modulation transfer function	≥0.5@107 lp/mm
Spotradius encircled 80% energy /μm	<3.2
Depth of field /m	10

Table 2. Initiating structure parameter
View table
Table 2. Initiating structure parameter
Parameter Lens 1 Lens 2 Stop Lens 3 Image
Sequence 1 2 3 4 5 6 7 8
Radius 2.021 1.362 3.939 3.058 Infinity -19.940 -2.338 Infinity
Thickness 0.670 0.665 1.231 0.182 0.802 0.849 6.351

Table 3. Lens structure parameters after optimization
View table
Table 3. Lens structure parameters after optimization
Parameter Lens 1 Lens 2 Stop Lens 3 Lens 4 Image
Sequence 1 2 3 4 5 6 7 8 9
Radius 2.246 2.704 22.058 11.910 Infinity -4.611 -1.147 -2.310 Infinity
Thickness 0.546 0.581 0.300 0.600 0.495 0.479 0.733 4.445

Table 4. Results of the most sensitive tolerance analysis unit: mm

View table

Table 4. Results of the most sensitive tolerance analysis unit: mm

Type			Value	Criterion	Change
TSDX	1		0.01000000	0.61998101	-0.04294991
TSDY	1		0.01000000	0.61998101	-0.04294991
TSDX	1		-0.01000000	0.61998101	-0.04294991
TSDY	1		-0.01000000	0.61998101	-0.04294991
TTHI	2	4	0.03000000	0.62469954	-0.03642230
TFRN	3		1.00000000	0.62650862	-0.03642230
TEDY	1	2	-0.02000000	0.62804440	-0.03488652
TEDX	1	2	-0.02000000	0.62804440	-0.03488652
TEDX	1	2	0.02000000	0.62804440	-0.03488652
TEDY	1	2	0.02000000	0.62804440	-0.03488652

Table 5. Allowable tolerances for parts

View table

Table 5. Allowable tolerances for parts

Surface	1	2	3	4	5	6	7	8
Radius tolerance	±3	±3	±1	±1		±3	±3	±3
Thickness tolerance /mm	±0.03	±0.03	±0.02	±0.03	±0.02	±0.02	±0.02
Element eccentricity tolence /mm	±0.02		±0.02			±0.02
Surface eccentricity tolence /mm	0.01	0.01	0.02	0.02		0.01	0.005	0.005
Surface irregularity	±0.2	±0.2	±0.1	±0.2		±0.2	±0.2	±0.2
Refractive index	0.001		0.001			0.001	0.001
Abbe coefficient tolerance /%	±0.9		±2.6			±0.7	±0.4

Table 6. Results of Monte Carlo tolerance analysis
View table
Table 6. Results of Monte Carlo tolerance analysis
Number of Monte Carlo samples /% MTF value
>90 0.48677996
>80 0.51156053
>50 0.55240768
>20 0.59662360
>10 0.61346962

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Yizhen Zhu, Shunyao Li, Shuangmu Zhuo, Lan Yang. Designing Optical Systems for Close-Distance Vehicle Lenses in Target Recognition[J]. Laser & Optoelectronics Progress, 2022, 59(17): 1722001

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