-
基于偏振调制的三维成像激光雷达, 具有测量范围远、测量精度较高、成像速度快、无运动伪像等优点, 同时不受其他调制方式中增强电荷耦合器件、雪崩光电二极管阵列探测器工艺复杂、易饱和损坏等缺点限制, 但存在需要双相机、成像视场角受电光晶体限制、成像质量易受到入射角度及云雾等大气条件影响等缺点. 为克服上述缺点, 本文提出采用偏振成像激光雷达与短波红外变焦光学系统共孔径复合的方式, 构建双模目标探测成像系统. 开展偏振成像激光雷达与短波红外复合光学系统设计研究, 使用光学设计软件完成系统光学设计, 并对完成系统像质分析; 使用光学仿真软件对光学系统成像过程仿真; 分析仿真结果表明所设计光学系统成像质量良好、设计正确可行. 本文所采用方法为偏振调制成像激光雷达研究提供一种新思路.
The basic principle of three-dimensional (3D) imaging lidar-an active imaging technology, is parallel laser ranging. Compared with traditional passive sensor imaging and microwave radar, the 3D imaging lidar has obvious advantages, so it promises to possess a wide application prospect. Non-scanning 3D imaging lidar has seven modulation modes. Among them, the 3D imaging lidar based on polarization modulation has the advantages of large measurement range, high measurement accuracy, fast imaging speed, and no motion artifacts. At the same time, it is not limited by other modulation methods, such as intensified charge coupled device and avalanche photodiode array detectors, and its process is complex but easy to saturate and damage. However, its disadvantage is that it requires two cameras, electro-optic crystal limits the imaging field of view, and is easily affected by atmospheric conditions such as incident angle and cloud and mist. In order to overcome the above shortcomings, in this paper we propose to use polarization imaging lidar and short-wave infrared zoom optical system to construct a dual-mode target detection imaging system by means of common aperture, which can not only reduce the volume of the two systems and solve the coaxial problem of the two systems, but also solve the problems such as the influence of atmospheric conditions (small viewing angle, incident angle and cloud and mist) on imaging quality of polarization modulation imaging lidar and the limitation of low energy of short-wave infrared imaging targets. According to the above ideas, the design and research of polarization imaging lidar and shortwave infrared composite optical system are carried out. The optical design software is used to complete the optical design of the telescope group, shortwave infrared imaging lens group, polarization modulation lens group and the system as a whole. In the telescope group the off-axis three-mirror structure is used to solve the blocking problem of the center of the field of view, and in the shortwave infrared lens group the type of mobile zoom compensation group is used to realize zooming. Analysis of the image quality of the optical system shows that the designed optical system has high imaging quality and its optical design meets the requirements for system design. The optical simulation software is used to simulate the imaging process of the optical system. The results show below. The polarization imaging lidar and shortwave infrared imaging have high quality, the stray light has little influence on the imaging of the system, the target edge imaging is clear, and the independent square targets with a 1-m in diameter can be distinguished. The field of view of the short-wave infrared short-focus mode is 9 times that of the long-focus mode. The shortwave infrared telescopic mode is basically consistent with the field of view of polarization imaging lidar. The received illuminance value of polarization imaging lidar is about 2.4 times that of short-wave infrared long focal length mode. The overall energy distribution of polarization imaging lidar is more balanced, and the imaging effect is better. The method adopted in this paper provides a new idea for studying the polarization modulated imaging lidar. The next step in experimental research is to complete the physical processing, assembly and adjustment, and selection of suitable targets. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] -
参数 短波红外变焦成像 偏振成像激光雷达 工作波段 0.9—1.7 μm 0.532 μm 探测器像元尺寸 15 μm 3.45 μm 探测器像元数 640 × 512 2448 × 2048 焦距 300(900) mm 725 mm 视场角 2° × 1.5° (0.67° × 0.5°) 0.67° × 0.56° 入瞳直径 150 mm 150 mm F数 2(6) 4.8 MTFdesign ≥ 0.408 ≥ 0.408 公差项 短波红外成
像镜组偏振调
制镜组曲率半径公差最小值/mm 0.01 0.1 厚度公差最小值/mm 0.01 0.5 表面不规则度公差最
小值/ring0.5 0.5 空气间隔公差最小值/mm 0.04 0.08 装调偏心公差最小值/mm 0.01 0.02 装调倾斜公差最小值/mrad 0.15 0.15 折射率公差最小值 0.002 0.001 -
[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]
计量
- 文章访问数:8043
- PDF下载量:207
- 被引次数:0