1 天津大学精密测试技术及仪器国家重点实验室, 天津 300072
2 中国工程物理研究院化工材料研究所, 四川 绵阳 621999
针对工业检测中对表面缺陷的高精度检测和定位需求,提出了一种缺陷特征重建方法。通过在基于双目光栅投影的三维重构系统上附加纹理相机,实现对于重构点云模型的纹理映射,并结合纹理相机图像中提取到的特征区域,完成表面特征的三维重构。针对待测物体需要进行多视角重建的情况,引入精密转台,利用旋转轴标定方法获取不同旋转位置下纹理图像与点云数据的映射关系,并利用基于距离判据的判断方法实现了对遮挡部分点云的剔除。采用四象限临近点搜索和基于距离加权平均的线性插值方法对纹理图像中像素坐标进行三维测量。实验完成了对于图像中标注缺陷轮廓内像素点的重建,实现了对于表面特征的精确尺寸计算和定位,通过对重建的缺陷尺寸和位置进行计算并与影像测量仪测得结果进行对比,可得本文方案对缺陷三维尺寸和位置的测量误差不超过0.2 mm,且能更准确地计算缺陷面积。
测量 三维重构 纹理映射 视觉测量 表面缺陷定位
Author Affiliations
Abstract
1 State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
A modified spectral beam combining (SBC) approach based on double asymmetrical filters was proposed. By using this scheme, the high-order lateral modes at the edge of the far-field pattern can be suppressed in the external cavity, and the beam quality in the slow-axis direction was improved from 16.1 to 13.4 compared to the conventional SBC. In the meanwhile, the electrical-to-optical efficiency from the modified SBC was more than 40% with an output power of 34.1 W, which is similar to that of the conventional SBC.
140.3298 Laser beam combining Chinese Optics Letters
2019, 17(1): 011401
Author Affiliations
Abstract
1 State Key laboratory of Luminescence and Application, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 Suzhou Everbright Photonics Co., Ltd, Suzhou 215000, China
Broad-area diode lasers usually supply high output power but low lateral beam quality. In this Letter, an on-chip combined angled cavity is proposed to realize narrow lateral far field patterns and high brightness. The influence of included angles, emitting facets on output power, and beam quality are investigated. It demonstrates that this V-junction laser is able to achieve a single-lobe far field at optimal cavity length with a 3.4 times improvement in brightness compared with Fabry–Perot (F-P) cavity lasers. The excited high-order modes at a high injection level reduce the brightness, but it is still 107% higher than that of F-P lasers.
140.3070 Infrared and far-infrared lasers 140.5960 Semiconductor lasers 140.3295 Laser beam characterization Chinese Optics Letters
2017, 15(8): 081402
1 长春理工大学电子信息工程学院,吉林 长春 130022
2 中国科学院长春光学精密机械与物理研究所, 吉林 长春 130033
3 长春机械科学研究院有限公司, 吉林 长春 130103
半导体宽谱激光在传感、光谱学等领域有着重要的应用.传统半导体宽谱激光器主要采用宽增益材料和全反射波导, 采用简单量子阱结构制备宽谱激光器一直是个难题.作者首次证明了一种基于布拉格反射波导一维光子晶体的新型量子阱宽谱激光器, 其结构主要包括InGaAs/GaAs量子阱和上下布拉格反射镜, 通过偏离解理实现激光输出.研究发现在偏离角7°时, 器件展现宽谱超辐射发光二极管特性, 4.4°偏离角时实现了宽光谱激光输出, 光谱宽度达到33.7 nm, 连续输出功率36 mW.本研究为探索新型量子阱宽谱激光器提出了一种新的技术途径.
半导体激光器 量子阱 宽光谱 光子晶体 布拉格反射波导 semiconductor lasers quantum well broad spectrum photonic crystal Bragg reflection waveguide
1 南京林业大学 化学工程学院, 江苏 南京 210037
2 中国科学院 长春光学精密机械与物理研究所 发光学及应用国家重点实验室, 吉林 长春130033
激光诱导击穿光谱(LIBS)技术是一种基于原子发射光谱学的元素定性、定量检测手段。本文介绍了LIBS技术的原理、应用方式、检测元素种类及检测极限; 综述了该项技术在固体、液体、气体组分检测方面的技术发展, 以及在环境检测、食品安全、生物医药、材料、**、太空领域的应用进展。最后, 提出了高功率、高稳定的激光光源和准确的定量分析方法是LIBS技术目前所面临的问题和挑战。
激光诱导击穿光谱 激光产生等离子体 元素分析 检测限 laser-induced breakdown spectroscopy laser-induced plasmon element analysis detection limit
