Design of Fixed Focus System for Laser Velocimeter
LÜ Dan1,LIN Jun1,2,3,ZHOU Jian4
1. Fujian Metrology Institute, Fuzhou, Fujian 350003, China
2. Key Laboratory for Fujian Energy Metrology, Fuzhou, Fujian 350003, China
3. National Urban Energy Metrology Center(FJ), Fuzhou, Fujian 350003, China
4. National University of Defense Technology,Changsha, Hunan 410000, China
Abstract：To meet the speed measurement needs of laser velocimeter in meter level distance, a fixed focus system for laser velocimeter was designed. First, the spot radius at different positions from laser exit were measured by beam profiler, then the waist radius and position of laser beam were got by the function fitting method. The telescope system is used as the basic structure of the fixed focus system, the parameters of fixed focus system were exhausted by MATLAB software, and all the satisfied parameters were recorded. According to the actual conditions, a set of data was chosen to apply to laser velocimeter, the laser spot radius is less than 0.6mm at 4.5m and 5.5m, which matched the expectations.
［1］杜磊,孙桥,林峰,等. 基于真实交通状况的固定式机动车现场测速标准装置［J］. 计量学报, 2018, 39(2): 207-212.
Du L, Sun Q, Lin F, et al. Fixed Standard Instrument for Field Tests of Vehicle Speed Measuring Devices Based on Actual Traffic ［J］. Acta Metrologica Sinica, 2018, 39(2): 207-212.
［2］蔡常青,孙桥,张跃,等. 机动车激光测速仪校准技术的研究［J］. 计量学报, 2008, 29(4): 339-343.
Cai C Q,Sun Q, Zhang Y,et al. Study on Lidar Calibration Technique for Vehicle Speed-Measuring Device ［J］. Acta Metrologica Sinica, 2008, 29(4): 339-343.
［3］朱云龙,胡鹤鸣,金仲佳, 等. 基于激光跟踪仪的拖曳水槽车速动态校准［J］. 计量学报, 2019, 40(2): 272-277.
Zhu Y L, Hu H M, Jin Z J, et al. Dynamic Calibration of Towing Tank Speed Based on Laser Tracker ［J］. Acta Metrologica Sinica, 2019, 40(2): 272-277.
［4］杨铁牛,邹胜,吴宗跃, 等. 低压流场速度测量的不确定度分析［J］. 计量学报, 2019, 40(2): 278-284.
Yang T N, Zou S, Wu Z Y, et al. Uncertainty Analysis of Velocity Measurement in Low Pressure Flow Field ［J］. Acta Metrologica Sinica, 2019, 40(2): 278-284.
［5］李帅,孙华燕,赵延仲.基于光电目标的激光外差探测系统信噪比分析［J］. 兵器装备工程学报, 2018, 39(3): 178-181.
Li S,Sun H Y,Zhao Y Z. SNR Analysis of Laser Heterodyne Detection System Based on Electro-Optical Target ［J］. Journal of Sichuan Ordnance, 2018, 39(3): 178-181.
［6］周峰,徐广平.提升激光探测信噪比的几种方法［J］. 激光与红外, 2018, 48(12): 1491-1495.
Zhou F, Xu G P. Several ways to improve the SNR of laser detection ［J］. Laser & Infrared, 2018, 48(12): 1491-1495
［7］Katayama S, Kawahito Y, Mizutani M. Latest Progress in Performance and Understanding of Laser Welding［J］. Physics Procedia, 2012, 39:8-16.
［8］崔立夫, 罗瑞芳. 高斯光束参数简介及束腰的快速测量计算［J］. 天津科技, 2018, 45(1): 27-31.
Cui L F, Luo R F. Introduction of Gaussian Beam Parameters and Rapid Measurement and Calculation of Beam Waist ［J］. Tianjin Science & Technology, 2018, 45(1): 27-31.
［9］陈海滨,唐瑛,张雄星, 等. 纹影仪光源的结构设计［J］. 计量学报, 2018, 39(4): 481-484.
Chen H B, Tang Y, Zhang X X, et al. Structure Design of Schlieren Apparatus Light ［J］. Acta Metrologica Sinica, 2018, 39(4): 481-484.
［10］罗宽. 激光光束特性参数测量技术研究［D］. 吉林:长春理工大学, 2015.
［11］景文博, 张汝平, 王晓曼, 等. CCD的非线性响应特性对光束质量测量的影响及修正［J］. 红外与激光工程, 2017, 46(8): 127-134.
Jing W B, Zhang R P, Wang X M, et al. Impact and correction of CCD nonlinear response on measurement of the laser beam quality［J］.Infrared and Laser Engineering, 2017, 46(8): 127-134.
［12］唐远鸿,吴云峰,张晨雨,等.光纤转镜式高速相机同步转速传感器的设计［J］.计量学报, 2019, 40(2):213-219
Tang Y H, Wu Y F, Zhang C Y, et al. Design of Synchronous Speed Sensor of Optical High-speed Rotating-mirror Camera ［J］. Acta Metrologica Sinica, 2019, 40(2):213-219
［13］孙海滨. 涡旋光与激光散斑的产生机理及应用研究［D］. 济南:山东师范大学, 2017.
［14］孔桂华, 欧家鸣. 高斯光束通过离焦望远镜系统的变换［J］. 云南师范大学学报, 2004, 24(2): 42-48,57.
Sun G H, Ou J M. Gaussian beam propagation through a defocusing telescopic system ［J］. Journal of Yunnan Normal University, 2004, 24(2): 42-48,57.
［15］张健,胡明勇,吕敏,等.基于CCD图像处理的双波长激光聚焦点定位方法［J］. 量子电子学报, 2019, 36 (3): 317-323.
Zhang J, Hu M Y, Lv M, et al. Positioning method of dual wavelength laser focusing spot based on CCD image processing ［J］. Chinese Journal of Quantum Electronics, 2019, 36 (3): 317-323.
［16］闵志欢,黄茂江.光斑对激光点位精度的影响的探讨［J］. 科技广场, 2014, (11): 27-31.
Min Z H, Huang M J. Discussion on the Effects of Light on the Precision of Laser Spot ［J］. Science Mosaic, 2014, (11): 27-31.
2021, Vol. 42 
