Design of low altitude high resolution lidar optical system

Zhuang Liu; Chao Wang; Lun Jiang; Haodong Shi

doi:10.3788/IRLA20200117

Journals >Infrared and Laser Engineering >Volume 50 >Issue 1 >Page 20200117 > Article

Infrared and Laser Engineering
Vol. 50, Issue 1, 20200117 (2021)

Design of low altitude high resolution lidar optical system

Zhuang Liu, Chao Wang, Lun Jiang, and Haodong Shi

Author Affiliations

Institute of Space Photo-electronics Technology, Changchun University of Science and Technology, Changchun 130022, China

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DOI: 10.3788/IRLA20200117 Cite this Article

Zhuang Liu, Chao Wang, Lun Jiang, Haodong Shi. Design of low altitude high resolution lidar optical system[J]. Infrared and Laser Engineering, 2021, 50(1): 20200117 Copy Citation Text

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Fig. 1. [in Chinese]

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Fig. 2. [in Chinese]

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Fig. 3. [in Chinese]

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Fig. 4. [in Chinese]

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Fig. 5. [in Chinese]

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Fig. 6. [in Chinese]

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Fig. 7. [in Chinese]

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Parameter	Value
Lidar wavelength/nm	1064
Array	200×200
Pixel resolution	0.5 mrad@Spot duty ratio 0.9
Scanning range	5.75°×5.75°
Frame rate of lidar/fps	2
Spectral range of visible imaging/nm	450-700
Pixel resolution of visible imaging/ mrad·pixel⁻¹	0.10
FOV of visible camera	5.75°×5.75°
Frame rate of visible imaging/fps	45

Table 1. [in Chinese]

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Number	Radius/mm	Thickness/mm	Glass
1	Inf	20
MEMS	Inf	−10
3	92.642	−2	N-SK10
4	−14.622	−6.039
5	−235.659	−2.018	N-SK10
6	−385.957	−9.855
7	28.620	−2.322	N-SK10
8	27.605	−3.316
9	52.799	−4.45	N-SK10
10	20.867	−10

Table 2. [in Chinese]

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Parameter	Value
DMD mirror size/mm²	8.66×6.93
DMD array	1140×912
Micro-mirror size/μm²	7.6×7.6
Refresh rate (1 bit)/Hz	22727
Detector pixel size/μm²	6.45×6.45
Detector array scale	1384×1036

Table 3. [in Chinese]

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Stop	Inf	Thickness	Glass
2	51.421	14.917	Sk14
3	−114.620	5.37
4	−59.084	5.08	SF10
5	−1461.183	18.225
6	44.932	7.039	N-LAK7
7	−48.425	3.151
8	−36.412	3.318	SF10
9	−96.467	1.000
10	18.653	5.907	H-BAK3
11	11.868	3.704
12	Inf	25.400	BK7
13	Inf	0.500
14	Inf	0.500	BK7
15	Inf	1.306(1.0)
16	Inf	2.969	Mirror（Image）
17	−30.862	3.708	SF59
18	−19.941	41.412
19	415.994	2.949	SF59
20	−135.375	12.000
21	33.911	3.948	SF59
22	135.465	5.286
23	−21.172	8	SF59
24	−30.314	18.080
25	43.745	3.997	SF59
26	−90.478	1
27	10.144	9.527	SF59
28	7.992	3

Table 4. [in Chinese]

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Parameter	Value	Data sources
Peak power of laser pulse (P_L)	8.9 kW	Average power of fiber laser: 5 W; The repetition frequency: 80 kHz; Pulse width: ≤7 ns;
Transmittance of transmitting terminal (T_E)	82%	Fiber-collimator coupling efficiency: 99%; Transmittance of fiber collimator: 99%; Reflectance of MEMS mirror: 98%; Transmittance of single lens surface: 98%；Transmittance of 8 surfaces: 85%;
Reflectivity of target (ρ) Aperture of receiving terminal (A_R)	65% 30 mm	Reflection of hard plastic surface commonly used in rotor UAV : 60%-70%; Design value of diameter: 30 mm;
Transmittance of receiving terminal (T_R)	24.6%	Transmittance of single surface of lens is 98%, Total transmittance of 31 surfaces: 53%; Transmittance of PBS: 50%; Transmittance of narrowband filter: 97%; Reflective of DMD: 95%;
Atmospheric transmittance (T_α)	≈90%	Simulation results based on atmospheric transmittance software.

Table 5. [in Chinese]

Zhuang Liu, Chao Wang, Lun Jiang, Haodong Shi. Design of low altitude high resolution lidar optical system[J]. Infrared and Laser Engineering, 2021, 50(1): 20200117

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