Optics and Precision Engineering, Volume. 33, Issue 4, 521(2025)
Design of receiving optical system for asteroid terrain detection LiDAR
Figures & Tables(16)
Fig. 1. Schematic layout of the receiving optical system and the reflecting optical system
Fig. 4. Imaging optical path of the outer ring region， the middle ring region and the inner ring region when the object distance is 200 m， 75 m and 42 m respectively
Fig. 5. Energy concentration and distortion of the optical system in the outer ring region， the middle ring region and the inner ring region when the object distance is 200 m， 75 m and 42 m respectively
Fig. 7. Energy curves through the outer ring， the middle ring and the inner ring at different distances
Fig. 10. Normalized energy of theoretical simulation and practical test at different object distances
Table 1. Signal photon number calculation parameters
View tableView in ArticleTable 1. Signal photon number calculation parameters
符号 参数意义 数值 接收光学系统的透过率 0.78 衍射光栅效率 0.7 激光峰值功率 4.2 kW 摆镜反射效率 0.85 目标反射率 0.2 等效通光孔径 / 激光光束与目标表面法线方向的夹角 R 探测距离 300 m N 光束数量 1 024 接收视场角 0.1 mrad 激光发散角 0.15 mrad 透反镜反射率 0.8 Δt 激光脉冲宽度 0.8 ns h 普朗克常数 6.63×10-34 J·s c 真空中光速 3×108 m/s λ 激光波长 532 nm
Table 2. Parameters of the receiving optical system
View tableView in ArticleTable 2. Parameters of the receiving optical system
序号 项目 技术指标 1 焦距f 69.9 mm 2 工作范围 30~300 m 3 对角线视场2ω 1.91° 4 光谱范围 532 nm 5 入瞳直径D
（最大有效几何尺寸）
≥47 mm 6 工作温度 0~40 ℃
Table 3. Design parameters of the receiving optical system
View tableView in ArticleTable 3. Design parameters of the receiving optical system
序号 项目 要求指标 设计指标 1 焦距f 69.9 mm 69.9 mm 2 工作范围 30~300 m 30~300 m 3 对角线视场2ω 1.91° 1.91° 4 光谱范围 532 nm 532 nm 5 入瞳直径D ≥47 mm 47 mm
（分为外环、中环内环3个区域）
9 工作温度 0~40 ℃ 0~40 ℃
Table 4. Diameter of the dispersion spot when 80% energy is concentrated in 1 field of view under different temperature and pressure
View tableView in ArticleTable 4. Diameter of the dispersion spot when 80% energy is concentrated in 1 field of view under different temperature and pressure
温度
/°C
环境 1视场集中80%能量的弥散斑直径/μm 外环，物距200 m 中环，物距75 m 内环，物距42 m 0 常压 3.9 10.2 4.6 真空 6.1 10.4 4.7 10 常压 3.9 10.2 4.6 真空 5.2 10.4 4.7 20 常压 4 10.2 4.6 真空 4.5 10.4 4.7 30 常压 4.2 10.2 4.6 真空 3.9 10.4 4.7 40 常压 4.4 10.2 4.6 真空 3.7 10.4 4.7
Table 5. Energy passing through the outer ring， the middle ring and the inner ring at different distances
View tableView in ArticleTable 5. Energy passing through the outer ring， the middle ring and the inner ring at different distances
物距/m 外环/w 中环/w 内环/w 总和/w 30 0 18 724 16 069 34 793 42 296 38 700 15 490 54 486 75 16 684 41 414 6 872 64 970 100 46 254 23 573 3 536 73 363 150 98 632 7 613 1 283 107 528 200 91 120 3 120 633 94 873 250 67 601 1 543 373 69 517 300 48 538 882 247 49 667
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Yunfang ZHANG, Feihu ZHU, Yan ZHENG, Jianfeng CHEN, Shuai HONG, Zhe CAO, Donglai ZHANG, Guangqing SHI, Lin LI, Li WANG. Design of receiving optical system for asteroid terrain detection LiDAR[J]. Optics and Precision Engineering, 2025, 33(4): 521
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Received: Nov. 14, 2024
Accepted: --
Published Online: May. 20, 2025
The Author Email: Feihu ZHU (zhufeihu1986@163.com)
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