Freeform-Surface-Based Optical Detection System with Large Relative Aperture and Large Field of View

Zixuan Ma; Xuyang Li; Zhiguang Ren; Nanqing Chu

doi:10.3788/AOS202040.1722002

Acta Optica Sinica, Volume. 40, Issue 17, 1722002(2020)

Freeform-Surface-Based Optical Detection System with Large Relative Aperture and Large Field of View

Zixuan Ma^1,2、**, Xuyang Li^1,2、*, Zhiguang Ren^1,3, and Nanqing Chu^1,2

¹Space Optics Technology Lab, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, Shaanxi 710119, China

²School of Optoelectronics, University of Chinese Academy of Sciences, Beijing 100049, China

³School of Physics and Information Technology, Shaanxi Normal University, Xi'an, Shaanxi 710119, China

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Figures & Tables(16)

Fig. 1. Structural diagram of system

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Fig. 2. Field of view of system

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Fig. 3. Shape of freeform surface. (a) Two-dimensional; (b) Three-dimensional

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Fig. 4. Spot diagram

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Fig. 5. Surrounding energy distributions. (a) FOV 1-5; (b) FOV 6-10

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Fig. 6. Field curvature and distortion

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Fig. 7. Distortion grid

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Fig. 8. 80% surrounding energy distribution estimation under predetermined tolerance

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Fig. 9. 80% surrounding energy distribution estimation after tolerance correction

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Table 1. Design parameters
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Table 1. Design parameters
Parameter Value
Wavelength /nm 450-850
Focal length /mm 158
Entrance pupil /mm 150
F number 1.05
Field of view /(°) 20
Pixel size /(μm×μm) 10×10
Detector size /(mm×mm) 40×40

Table 2. System data

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Table 2. System data

Surface	Surfacetype	Radius ofcurvature /mm	Conicconstant	Thickness /mm	Material	Aperture /mm
Object	Standard	Infinity		Infinity	Air
1	Standard	192.67		25.00	Silica _special	210.84
2	Standard	340.08		43.62	Air	204.91
3	Standard	-234.44		20.00	HBAK4_CDGM	201.76
4	Standard	301.16		6.49	Air	200.50
5	Quadric	165.90	-1.33	41.20	BaF₂_special	208.61
6	Standard	-6255.80		65.39	Air	207.58
7	Standard	373.09		20.00	HZF6_CDGM	189.23
Stop	Standard	190.02		21.10	Air	146.79
9	XY polynomial	161.90	-1.77	31.46	BaF₂_special	181.10
10	Standard	-530.65		5.00	Air	180.21
11	Standard	204.17		29.50	BaF₂_special	168.98
12	Standard	-1068.73		5.00	Air	165.26
13	Standard	157.87		32.23	BaF₂_special	153.27
14	Standard	-1608.91		5.00	Air	149.03
15	Standard	105.36		35.00	BaF₂_special	122.04
16	Standard	-282.20		15.00	HLAK67_CDGM	110.55
17	Standard	52.27		64.75	Air	77.00
Image plane	Standard	Infinity		0		66.52

Table 3. Corresponding number of field of view
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Table 3. Corresponding number of field of view
Field No. 1 2 3 4 5
Field of view (0°,0°) (0°,5°) (3.5°,3.5°) (5°,0°) (0°,7°)
Field No. 6 7 8 9 10
Field of view (5°,5°) (7°,0°) (0°,10°) (7°,7°) (10°,0°)

Table 4. Parameters of XY freeform surface
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Table 4. Parameters of XY freeform surface
Item Coefficient
X² -0.000755341578837755
Y² -0.000755341617671267

Table 5. Predetermined tolerance

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Table 5. Predetermined tolerance

Tolerance type	Tolerance value
Lens thickness and air gap	0.02 mm
Lens tilt angle	0.001 rad
Lens offsetting distance	0.02 mm
Lens wedge angle	0.0003 rad
Lens aperture	2
Two-dimensional irregularity of lens	0.2
Curvature radius (aspherical)	0.01 mm
Quadric surface constant	0.001
Random RMS surface error (aspherical)	0.025
Refractive index of material	0.0001
Abbe number of material	0.002

Table 6. Sensitive tolerance
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Table 6. Sensitive tolerance
Tolerance type Active surface Expected tolerance
Lens tilt angle 3 and 7 0.0003 rad
Lens offsetting distance All 0.01 mm

Table 7. Estimated maximum enveloping square side length corresponding to 80% surrounding energy distribution
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Table 7. Estimated maximum enveloping square side length corresponding to 80% surrounding energy distribution
Proportion ofchange /% Maximum envelopingsquare side length /μm
-0.50 20.719
-0.40 20.241
-0.30 19.849
-0.20 19.546
-0.10 19.351
0 17.326
0.10 18.627
0.20 18.815
0.30 18.883
0.40 19.363
0.50 19.949

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Zixuan Ma, Xuyang Li, Zhiguang Ren, Nanqing Chu. Freeform-Surface-Based Optical Detection System with Large Relative Aperture and Large Field of View[J]. Acta Optica Sinica, 2020, 40(17): 1722002

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