Design and Implementation of Primary Mirror Support Structure of LiDAR

Guoqing Zhou; Ke Gao; Jinhuang Wu; Naihui Song; Guoshuai Jia; Xiang Zhou; Jiasheng Xu

doi:10.3788/LOP232689

Laser & Optoelectronics Progress, Volume. 61, Issue 17, 1722003(2024)

Design and Implementation of Primary Mirror Support Structure of LiDAR

Guoqing Zhou^1,2、*, Ke Gao^1,2, Jinhuang Wu^1,2, Naihui Song^1,2, Guoshuai Jia^1,2, Xiang Zhou^1,2,3, and Jiasheng Xu^2,4

Author Affiliations

¹College of Mechanical and Control Engineering, Guilin University of Technology, Guilin 541006, Guangxi, China

²Guangxi Key Laboratory of Spatial Information and Geomatics, Guilin University of Technology, Guilin 541006, Guangxi, China

³School of Microelectronics, Tianjin University, Tianjin 300072, China

⁴College of Geomatics and Geoinformation, Guilin University of Technology, Guilin 541006, Guangxi, China

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Figures & Tables(21)

Fig. 1. LiDAR optical receiving system

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Fig. 2. Three-dimensional view of reflector

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Fig. 3. Support component modelling diagram

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Fig. 4. Support structure. (a) Annular thin cylinder; (b) N-shaped circular; (c) split structure

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Fig. 5. Physical image of reflector support component

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Fig. 6. Finite element meshing

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Fig. 7. First three orders of modal shapes. (a) First order; (b) second order; (c) third order

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Fig. 8. Finite element analysis cloud maps of reflector. (a) Gravity effects; (b) thermal coupling effect

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Fig. 9. Zernike polynomial surface fitting results

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Fig. 10. Simulation results. (a) Stress response curves; (b) sinusoidal acceleration stress response curve; (c) cloud map of deformation

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Fig. 11. Stochastic vibration acceleration response. (a) Input power spectral density curve; (b) acceleration PSD response curves

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Fig. 12. Stochastic vibration stress diagrams. (a) Response curves; (b) cloud map of deformation

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Fig. 13. Experiment of maximum field of view

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Fig. 14. Outdoor long-distance echo experiment

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Fig. 15. Experiment of airborne water depth measurement

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Table 1. Common material parameters

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Table 1. Common material parameters

Material	Density /（g·cm^-3）	Modulus of elasticity /GPa	Poisson’s ratio /10^-6	Coefficient of linear expansion /（10^-6 ℃^-1）
Microcrystalline glass	2.52	98	0.24	0.1
SiC	3.11	350	0.18	2.5
Magnesium alloy	1.77	45	0.30	25.0
Titanium allay	4.43	114	0.31	9.0
4J32	8.05	143	0.25	3.8×10^-2

Table 2. Modal analysis data for mirrors
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Table 2. Modal analysis data for mirrors
Order Frequency /Hz
Circular cylinder N-ring Split structure
First order 331.06 225.79 267.66
Second order 799.23 744.12 790.69
Third order 1376.10 1078.10 1155.30

Table 3. Analysis data of primary mirror surface shape
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Table 3. Analysis data of primary mirror surface shape
Support structure Circular cylinder N-ring Split structure
Gravitational PV /nm 14.78 12.74 15.03
RMS /nm 3.57 3.10 4.62
Thermal coupling PV /nm 37.25 42.52 53.32
RMS /nm 14.52 16.69 13.47

Table 4. Experimental data of maximum received field of view
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Table 4. Experimental data of maximum received field of view
No. Field of view /mrad Amplitude /mV
1 0 88
2 16.48 86

Table 5. Remote verification experimental data
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Table 5. Remote verification experimental data
No. Measured depth Actual depth Error
1 147.45 147.5 0.05
2 1042.80 1043.0 0.20

Table 6. Validation data of gulf test site
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Table 6. Validation data of gulf test site
No. Measured depth Actual depth Error
1 4.338 4.30 0.038
2 5.786 5.74 0.046
3 8.912 8.84 0.072
4 10.629 10.55 0.079
5 12.519 12.61 0.091

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Guoqing Zhou, Ke Gao, Jinhuang Wu, Naihui Song, Guoshuai Jia, Xiang Zhou, Jiasheng Xu. Design and Implementation of Primary Mirror Support Structure of LiDAR[J]. Laser & Optoelectronics Progress, 2024, 61(17): 1722003

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