基于CCD图像处理的双波长激光聚焦点定位方法

摘要/Abstract

摘要： 随着光纤耦合激光器的应用需求不断增大，对光纤与激光器的耦合效率要求也随之增大。不同波长激光的聚焦点位置存在差异，激光聚焦点位置是影响耦合效率的重要因素之一，对激光聚焦点的精准定位具有一定的实用性。设计一个聚焦组合透镜组聚焦激光器光束，采用CCD相机采集激光聚焦点焦前、焦后位置图像，通过MATLAB软件处理采集的图像，圆拟合光斑并计算光斑直径，直径最小位置即是聚焦点位置。结果表明，不同波长激光聚焦点位置不同且焦距相对误差分别为0.59%和0.73%，测量的焦点位置和大小均可精确到0.001 mm。该方法设计简单、具有自动性和精确性，对不可见激光聚焦位置的判断更显优越。

关键词: 图像处理, 激光聚焦点定位, 圆拟合, 双波长, 光学设计

Abstract: With the increasing demand for the application of fiber coupled laser ,the requirement for the coupling efficiency of fiber optic and laser increases.There are differences between the positions of the focusing spots of laser with different wavelength.The position of the laser focusing spot is one of the important factors affecting the coupling efficiency, and it has certain practicability for the precise positioning of the laser focusing spot.A focusing combined lens group focusing laser beam is designed. The CCD camera is used to collect the images of the front and back laser focusing points .The acquired images are processed by MATLAB software. The spot is fitted by circle and diameter is calculated.The position of the minimum diameter is the focus position. The results show that the laser focus position with different wavelength is different and the relative errors of focal length are 0.59% and 0.73% ,both the measured focus position and size can be accurate to 0.001 mm.The method has the advantages of simple design, automaticity and accuracy, and especially for judging the focus position of the invisible laser.

Key words: image processing, position of laser focusing point, circle fitting, dual wavelength, optical design

张健，胡明勇，吕敏，赵础矗，曹明坡. 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.

ZHANG Jian,HU Mingyong,LV Min,ZHAO Chuchu,CAO Mingpo. The Positioning Method of Dual Wavelength Laser Focusing Spot based on CCD Image Processing[J]. Chinese Journal of Quantum Electronics.

参考文献

[1] Wang Hai, Zhou Wenchao, Li Kaiwei, et al. Label-Free biosensing characteristics of micro/nano-fiber csoupler[J]. Acta Optica Sinica,2017,37(3):0306005. 汪海，周文超，李凯伟，等.微纳光纤耦合器无标生物传感特性[J].光学学报，2017,37(3):0306005. [2] Zhang Naiqian, Qin Tianling, Wang Zefeng, et al. Low-Loss coupling between tapered fibers and anti-resonant hollow-core photonic crystal fibers[J]. Laser & Optoelectronics Progress,2017,54(10):100608. 张乃千，秦天令，王泽锋，等.反共振空芯光子晶体光纤与拉锥光纤低损耗耦合[J].激光与光电子学进展,2017,54(10):100608. [3] Yu He, Ma Xiaohui, Zhao Xin, et al. Fiber coupling technology based on diode laser stack[J]. Chinese Journal of Lasers,2017,44(11):1101006. 于贺，马晓辉，赵鑫，等.基于半导体激光器堆栈的光纤耦合技术[J].中国激光,2017,44(11):1101006. [4] Yang Xianglin, et al. Optical fiber transmission system[M]. Jiangsu:Southeast University press,1991:142. 杨祥林, 等. 光纤传输系统[M]. 江苏：东南大学出版社,1991:142. [5] Lv Meng. Research on focus controlling syetem based on image processing[D]. Tianjin:Tianjin University,2010: 3-4. 吕猛. 基于图像处理技术的焦点控制系统的研究[D]. 天津：天津大学,2010:3-4. [6] Guo Zhenyu, Xie Na, He Pengju, et al. Design of experiment system for focal length easurement ofLens based on CCD[J]. Computer Technology and Development,2017,27(5): 174-178 . 郭振宇,谢娜,何鹏举,等.基于CCD的透镜焦距测量实验系统的设计[J].计算机技术与发展，2017，27（5）:174-178. [7] Xu Shanghua. The research of focal length changed in long distance welding[D]. Wuhan:Huazhong University of Science and Technology,2012:4. 徐尚华. 激光长距离焊接变焦距的研究[D]. 武汉：华中科技大学,2012:4. [8] Yu Daoyin ,Tan Hengying. Engineering Optics[M].2thed. Beijing:China Machine press,2006:104. 郁道银, 谈恒英. 工程光学[M].2版. 北京:机械工业出版社,2006:104. [9] Chen Ze,Hu Mingyong. Design of reflective collimator with large aperture based on ZPL micro instruction[J]. Chinese Journal of Quantum Electronics,2017,34(1):13-14. 陈泽，胡明勇.基于ZPL宏指令的大口径反射式平行光管设计[J].量子电子学报,2017,34(1):13-14. [10] Xu Guowang, Liao Mingchao. A varity of methods of fit circle[J]. Journal of Wuhan Polytechnic University,2002,4:104-112. 徐国旺,廖明潮.拟合圆的几种方法[J].武汉工业学院学报,2002,4:104-112. [11] Liu Haolong, Hou Wen, Fan Yalong, et al. An improved algorithm of laser spot center location[J]. Computer Measurement & Control,2014,22(1):139-141. 刘好龙,侯文,范亚龙,等.一种改进的激光光斑中心定位算法[J].计算机测量与控制,2014,22(1):139-141. [12] Ma Shiliang, Ma Qun, Shi Guoqing. Algorithm to process image of laser spot based on MATLAB[J]. Tool Engineering,2011,8,88-90. 马时亮,马群,史国清.基于MATLAB的激光光斑图像处理算法[J].工具技术,2011,8,88-90. [13] Cao Yuanjia, Yu Guangjun, Li Xianlong. Image processing and improvement of edge detection of laser spot[J]. Laser & Infrared,2016,46(9): 1160-1164 . 曹远佳,尉广军,李先龙.激光光斑的图像处理及边缘检测的改进[J].激光与红外,2016,46（9）:1160-1164. [14] Tang Nan, Mu Xiangyang, Hu Xudong. A study of welding seam X-ray image processing using morphology[J]. Mechanical Science and Technology,2006,25(9):1070-1072 . 汤楠,穆向阳,胡旭东.应用形态学运算的焊缝X射线图像处理[J].机械科学与技术,2006,25(9):1070-1072.

[1]	於康杰, 方波, 李剑敏, 王震, 蔡晋辉, 邬佳璐, 何正龙 . 太赫兹成像三维块匹配自适应Canny边缘检测算法[J]. 量子电子学报, 2023, 40(4): 458-468.
[2]	葛宏义 , 王飞 , 蒋玉英 , 李丽 , 张元 , 贾柯柯 , . 基于宽度学习的太赫兹光谱图像小麦霉变识别研究[J]. 量子电子学报, 2023, 40(3): 360-368.
[3]	杜天宇, 高昆∗ , 吴朝. 光栅相衬 CT 中吸收信号环形伪影的去除方法[J]. 量子电子学报, 2023, 40(1): 40-47.
[4]	陈建明, , 曾祥津, , 钟丽云, , 邸江磊, ∗ , 秦玉文, ∗. 基于深度学习的图像配准方法研究进展综述[J]. 量子电子学报, 2022, 39(6): 899-926.
[5]	黄雄豪, 王洋, 李新, 张艳娜, 刘恩超, 张权, 郑小兵∗. 太阳光谱辐照度仪光机系统设计[J]. 量子电子学报, 2022, 39(5): 806-814.
[6]	吴琼, 马雷∗. 一种基于 LoG 算子的量子图像边缘检测算法[J]. 量子电子学报, 2022, 39(5): 720-727.
[7]	杨一杉, 梁华为, 姚瑶, 陈帅∗. 金属遮挡条件下光子层析快速重构方法研究[J]. 量子电子学报, 2022, 39(4): 558-565.
[8]	张杨∗, 程正东, 朱斌. 基于改进 Faster R-CNN 的无人机小目标检测算法[J]. 量子电子学报, 2022, 39(3): 354-363.
[9]	毛仁祥, 常建华, 张树益李红旭, 张露瑶. 基于3D-MobileNetv2 的多目标实时跟踪框架[J]. 量子电子学报, 2022, 39(3): 364-372.
[10]	臧一鸣, 朱尚超, 魏战红∗, 刘志飞, 林小竹, 孙文韬. 一种量子图像伪彩色编码方法[J]. 量子电子学报, 2022, 39(3): 343-353.
[11]	毕祥丽, ∗, 宋毅恒, 闫秀生, 高文清, . 双波长智能协同激光制导方法研究[J]. 量子电子学报, 2021, 38(6): 863-871.
[12]	洪富祥, 陈冲, 丘仲锋∗. 一种基于机器视觉的无人机同心圆靶精准降落方法[J]. 量子电子学报, 2021, 38(3): 307-315.
[13]	陈儒, 杨义勤, 秦凡凯, 孟昭晖, 苗昕扬, 赵昆, 詹洪磊∗. 样本内部缺陷的太赫兹光谱成像与算法优化[J]. 量子电子学报, 2021, 38(3): 265-271.
[14]	胡凯, 徐亮∗, 杨伟锋, 曲立国, 金岭, 成潇潇, 沈先春, 王钰豪, 刘建国, 刘文清, . 太阳光谱地基跟踪遥感系统光学设计[J]. 量子电子学报, 2021, 38(3): 290-300.
[15]	王昱皓, 唐泽恬, 钟岷哲, 王阳, 曾瑞敏, 朱登玮, 杨晨. 基于相位相关和纹理分类的SIFT 图像拼接算法[J]. 量子电子学报, 2020, 37(6): 650-658.