基于CCD图像处理的双波长激光聚焦点定位方法
|
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.
With the increasing demand for the application of fiber coupled laser, the requirement for the coupling efficiency of fiber optic and laser laso increases. The positions of the focusing spots of laser with different wavelength are different. 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 is designed to focus laser beam. 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, where the spot is fitted by circle and the diameter of which 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 the size can be accurate to 0.001 mm. The method has the advantages of simple design,automaticity and accuracy, and especially in judging the focus position of the invisible laser.
With the increasing demand for the application of fiber coupled laser, the requirement for the coupling efficiency of fiber optic and laser laso increases. The positions of the focusing spots of laser with different wavelength are different. 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 is designed to focus laser beam. 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, where the spot is fitted by circle and the diameter of which 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 the size can be accurate to 0.001 mm. The method has the advantages of simple design,automaticity and accuracy, and especially in judging the focus position of the invisible laser.
引文
[1] Wang Hai, Zhou Wenchao, Li Kaiwei, et al. Label-free biosensing characteristics of micro/nano-fiber csoupler[J].Acta Optica Sinica(光学学报),2017,37(3):0306005(in Chinese).
[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 and Optoelectronics Proress(激光与光电子学进展),2017, 54(10):100608(in Chinese).
[3] Yu He, Ma Xiaohui, Zhao Xin, et al. Fiber coupling technology based on diode laser stack[J]. Chinese Journal of Lasers(中国激光),2017, 44(11):1101006(in Chinese).
[4] Yang Xianglin,et al. Optical Fiber Transmission System(光纤传输系统)[M]. Nanjing:Southeast University Press,1991:142(in Chinese).
[5] Lv Meng. Resarch on Focus Controlling Syetem Based on Image Processing(基于图像处理技术的焦点控制系统的研究)[D]. Tianjin:Master Thesis of Tianjin University, 2010:3-4(in Chinese).
[6] Guo Zhenyu, Xie Na, He Pengju, et al. Design of experiment system for focal length easurement of lens based on CCD[J]. Computer Technology and Develpment(计算机技术与发展),2017, 27(5):174-178(in Chinese).
[7] Xu Shanghua. The Research of Focal Length Changed in Long Distance Weling(激光长距离焊接变焦距的研究)[D].Wuhan:Master Thesis of Huazhong University of Science and Technology, 2012:4(in Chinese).
[8] Yu Daoyin, Tan Hengying. Engineering Optics(工程光学)[M]. 2thed. Beijing:China Machine press, 2006:104(in Chinese).
[9] Chen Ze, Hu Mingyong. Design of reflective collimator with large aperture based on ZPL micro instruction[J].Chinese Journal of Quantum Electronics(量子电子学报),2017, 34(1):13-14(in Chinese).
[10] Xu Guowang, Liao Mingchao. A varity of methods of fit circle[J]. Journal of Wuhan Polytechnic University(武汉工业学院学报),2002, 4:104-112(in Chinese).
[11] Liu Haolong, Hou Wen, Fan Yalong, et al. An improved algorithm of laser spot center location[J]. Computer Measurement and Control(计算机测量与控制),2014, 22(1):139-141(in Chinese).
[12] Ma Shiliang, Ma Qun, Shi Guoqing. Algorithm to process image of laser spot based on MATLAB[J]. Tool Engineering(工具技术),2011,8:88-90(in Chinese).
[13] Cao Yuanjia, Yu Guangjun, Li Xianlong. Image processing and improvement of edge detection of laser spot[J].Laser and Infrared(激光与红外),2016, 46(9):1160-1164(in Chinese).
[14] Tang Nan, Mu Xiangyang, Hu Xudong. A study of welding seam X-ray image processing using morphology[J].Mechanical Science and Technology(机械科学与技术),2006,25(9):1070-1072(in Chinese).
[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 and Optoelectronics Proress(激光与光电子学进展),2017, 54(10):100608(in Chinese).
[3] Yu He, Ma Xiaohui, Zhao Xin, et al. Fiber coupling technology based on diode laser stack[J]. Chinese Journal of Lasers(中国激光),2017, 44(11):1101006(in Chinese).
[4] Yang Xianglin,et al. Optical Fiber Transmission System(光纤传输系统)[M]. Nanjing:Southeast University Press,1991:142(in Chinese).
[5] Lv Meng. Resarch on Focus Controlling Syetem Based on Image Processing(基于图像处理技术的焦点控制系统的研究)[D]. Tianjin:Master Thesis of Tianjin University, 2010:3-4(in Chinese).
[6] Guo Zhenyu, Xie Na, He Pengju, et al. Design of experiment system for focal length easurement of lens based on CCD[J]. Computer Technology and Develpment(计算机技术与发展),2017, 27(5):174-178(in Chinese).
[7] Xu Shanghua. The Research of Focal Length Changed in Long Distance Weling(激光长距离焊接变焦距的研究)[D].Wuhan:Master Thesis of Huazhong University of Science and Technology, 2012:4(in Chinese).
[8] Yu Daoyin, Tan Hengying. Engineering Optics(工程光学)[M]. 2thed. Beijing:China Machine press, 2006:104(in Chinese).
[9] Chen Ze, Hu Mingyong. Design of reflective collimator with large aperture based on ZPL micro instruction[J].Chinese Journal of Quantum Electronics(量子电子学报),2017, 34(1):13-14(in Chinese).
[10] Xu Guowang, Liao Mingchao. A varity of methods of fit circle[J]. Journal of Wuhan Polytechnic University(武汉工业学院学报),2002, 4:104-112(in Chinese).
[11] Liu Haolong, Hou Wen, Fan Yalong, et al. An improved algorithm of laser spot center location[J]. Computer Measurement and Control(计算机测量与控制),2014, 22(1):139-141(in Chinese).
[12] Ma Shiliang, Ma Qun, Shi Guoqing. Algorithm to process image of laser spot based on MATLAB[J]. Tool Engineering(工具技术),2011,8:88-90(in Chinese).
[13] Cao Yuanjia, Yu Guangjun, Li Xianlong. Image processing and improvement of edge detection of laser spot[J].Laser and Infrared(激光与红外),2016, 46(9):1160-1164(in Chinese).
[14] Tang Nan, Mu Xiangyang, Hu Xudong. A study of welding seam X-ray image processing using morphology[J].Mechanical Science and Technology(机械科学与技术),2006,25(9):1070-1072(in Chinese).