Double optical wedge optical axis pointing adjustment technology

Gao Fei; Wang Miao

doi:10.12086/oee.2018.180218

Article navigation > Opto-Electronic Engineering > 2018 Vol. 45 > No. 11 > 180218

Next Article Previous Article

Gao Fei, Wang Miao. Double optical wedge optical axis pointing adjustment technology[J]. Opto-Electronic Engineering, 2018, 45(11): 180218. doi: 10.12086/oee.2018.180218

Citation:

Gao Fei, Wang Miao. Double optical wedge optical axis pointing adjustment technology[J]. Opto-Electronic Engineering, 2018, 45(11): 180218. doi: 10.12086/oee.2018.180218

Double optical wedge optical axis pointing adjustment technology

Gao Fei^1,,
Wang Miao^2, ,

1.
School of Electronic Engineering, Xi'an University of Posts and Telecommunications, Xi'an, Shaanxi 710121, China
2.
Xi'an Institute of Optics and Mechanics, Chinese Academy of Sciences, Xi'an, Shaanxi 710119, China

More Information

Corresponding author: Wang Miao, E-mail:wangmiao@opt.cn

Received Date 28 April 2018

Revised Date 12 July 2018

Published Date 01 November 2018

Abstract

Abstract

Because the double-wedge system can accurately adjust the orientation of the optical axis, it has the advantages of simple and compact structure, fast adjustment speed, and large adjustment angle. In order to meet the needs of a certain product, optical axis adjustment trajectories of concentric circles and zigzags are realized. Based on the existing theories, this paper establishes the corresponding formula by establishing the relationship between the optical axis deflection angle and the bi-wedge rotation angle model, and combines the Matlab simulation, the fitting and the actual product testing, and designs the use of ARM and computer-controlled bi-optical wedges to adjust the orientation of the optical axis. The results show that the error of the optical axis pointing adjustment of the scheme is less than 0.5°, and the expected trajectory can be achieved to meet the requirements of actual products.
- optical axis pointing adjustment /
- dual-optical wedge system /
- dual-optical wedge scan /
- ARM

FullText(HTML)

References

[1]	郁道银, 谈恒英.工程光学[M]. 2版.北京:机械工业出版社, 2006. Google Scholar Yu D Y, Tan H Y. Optical Engineering[M]. 2nd ed. Beijing: Mechanical Industry Press, 2006. Google Scholar
[2]	胡玉禧, 安连生.应用光学[M].合肥:中国科学技术大学出版社, 1996. Google Scholar Hu Y X, An L S. Applied Optics[M]. Hefei: University of Science and Technology of China, 1996. Google Scholar
[3]	贺磊, 袁家虎, 李展, 等.双光楔高精度角度发生器设计[J].光电工程, 2002, 29(6): 46–49, 60. doi: 10.3969/j.issn.1003-501X.2002.06.013 CrossRef Google Scholar He L, Yuan J H, Li Z, et al. Design of high-precision angle generator with double optical wedges[J]. Opto-Electronic Engineering, 2002, 29(6): 46–49, 60. doi: 10.3969/j.issn.1003-501X.2002.06.013 CrossRef Google Scholar
[4]	余巍.双光楔扫描激光雷达三维动态仿真研究[D].武汉: 华中科技大学, 2015. Google Scholar Yu W. 3D dynamic simulation of dual wedge scanning LiDAR[D]. Wuhan: Huazhong University of Science and Technology, 2015. Google Scholar
[5]	Degnan J, Machan R, Leventhal E, et al. Inflight performance of a second-generation photon-counting 3D imaging lidar[J]. Proceedings of SPIE, 2008, 6950: 695007. doi: 10.1117/12.784759 CrossRef Google Scholar
[6]	王保华.主动式激光制导导引头光学系统设计[D].长春: 中国科学院长春光学精密机械与物理研究所, 2012. Google Scholar Wang B H. Optical design and stray light analysis of active laser-guided seeker[D]. Changchun: Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 2012.http://cdmd.cnki.com.cn/Article/CDMD-80139-1013281213.htm Google Scholar
[7]	吕溥, 韩国华.双光楔在激光测距机光轴校正中的应用[J].激光技术, 2012, 36(2): 151–153. doi: 10.3969/j.issn.1001-3806.2012.02.002 CrossRef Google Scholar Lv P, Han G H. Application of dual wedges in optical axis alignment for laser rangefinders[J]. Laser Technology, 2012, 36(2): 151–153. doi: 10.3969/j.issn.1001-3806.2012.02.002 CrossRef Google Scholar
[8]	郭云曾, 杨小军, 杨小君, 等.旋转双光楔光路引导系统Matlab仿真研究[J].红外与激光工程, 2014, 43(3): 856–860. doi: 10.3969/j.issn.1007-2276.2014.03.034 CrossRef Google Scholar Guo Y Z, Yang X J, Yang X J, et al. Simulation study of rotating double optical wedge vectoring optics path based on Matlab[J]. Infrared and Laser Engineering, 2014, 43(3): 856–860. doi: 10.3969/j.issn.1007-2276.2014.03.034 CrossRef Google Scholar
[9]	Rosell F A. Prism scanner[J]. Journal of the Optical Society of America, 1960, 50(6): 521–526. doi: 10.1364/JOSA.50.000521 CrossRef Google Scholar
[10]	韦中超, 熊言威, 莫玮, 等.旋转双光楔折射特性与二维扫描轨迹的分析[J].应用光学, 2009, 30(6): 939–943. doi: 10.3969/j.issn.1002-2082.2009.06.011 CrossRef Google Scholar Wei Z C, Xiong Y W, Mo W, et al. Analysis of refraction characteristics of two-wedge rotation and two-dimensional scanning trajectory[J]. Journal of Applied Optics, 2009, 30(6): 939–943. doi: 10.3969/j.issn.1002-2082.2009.06.011 CrossRef Google Scholar
[11]	Shan J, Toth C K. Topographic Laser Ranging and Scanning: Principles and Processing[M]. London: Taylor & Francis Group, 2008. Google Scholar

Overview

Overview

Overview: A prism with a small refraction angle is called a wedge. Double optical wedges, also known as Risley prism pairs, are opto-mechanical components that consist of two closely spaced optical wedges with the same refractive index and equal angular refraction. Its main function is to adjust the optical axis by adjusting the rotation angle of the double wedge. In addition to the dual-optical wedge, which can realize the function of a single optical wedge, the relative motion of the two optical wedges can make the equivalent refraction angle of the two optical wedges change within a range of 0 to 2 single refraction angles of the single wedge, and select different rotation speeds and directions. One can get different scan patterns. Therefore, dual-optical wedges can form a flexible and diverse scanning format, and the structure is simple and easy to use. Based on the above advantages, bi-optic wedges are widely used in navigation systems, laser radar systems, satellite interactive systems, and laser micro-hole processing optical path control, high-precision angle generator.
When the double-wedge system is generally used, the rotation speed of the optical wedge is relatively stable and the control is relatively simple, and it is possible to realize the linear and petal-type trajectories; but when more complex trajectories are required, such as concentric circles and zigzags, this simple control method obviously cannot be achieved. In order to meet the needs of a certain product, optical axis adjustment trajectories of concentric circles and zigzags are realized. Based on the existing theories, this paper establishes the relationship between the optical axis deflection angle and the bi-wedge rotation degree model, and derives the corresponding formula. In combination with Matlab simulation, fitting and actual product testing, the dual-optical wedge using ARM and computer control is designed. To adjust the orientation of the optical axis. The results show that the error of the optical axis pointing adjustment of the scheme is less than 0.5°, and the expected trajectory can be achieved to meet the requirements of actual products. And the control method of the dual optical wedge controlled by the control system composed of ARM and stepper motor is given. The significance of this paper is to propose a new scheme for the traditional bi-wedge scanning method, and to give a realization method of concentric circles and zigzag scanning. And matlab simulation and actual test and experimental data analysis were carried out on the program. Through experimental analysis, we can see that the new program can meet the requirements of specific projects with high efficiency and time saving when facing different spot sizes. Based on the existing theory, this scheme is one of practical examples of dual-wedge scanning applications and concrete engineering, and extends the application range of dual-wedge scanning.