共查询到19条相似文献,搜索用时 125 毫秒
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如何对三维模型进行快速切片一直是分层制造的关键技术,分析对比两类切片方式,基于格式通用性、操纵灵活性及数据处理快速性方面考虑,选择STL文件作为该系统与三维造型软件的接口规范.从实时切片角度出发,在充分分析STL文件格式的基础上,提出STL模型拓扑快速重建的算法思想.通过预先为模型建立点表及邻接边表,实现模型的实时切片.该切片算法已经应用于激光三维雕刻系统,结果表明,算法快速稳定.最后给出了一个三维雕刻实例. 相似文献
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基于线结构光的柴油机缸盖三维形貌测量 总被引:1,自引:0,他引:1
为了获取某种型号内燃机工件的三维形貌数据,设计了线结构光非接触方式的移动扫描测量系统。探索出了以虚拟双目立体视觉原理为理论基础的相机光心平移轨迹所在直线的方向余弦标定的实现方法,从而确定由系统中各局部坐标系变换到系统全局坐标系的旋转矩阵R和平移向量T,进而求出系统中各个局部坐标系原点在系统全局坐标系下的坐标值,最后得到相机光心移动轨迹所在直线的方向余弦。探索出利用相机的移动距离及方向余弦将局部坐标系数据转换至全局坐标系的计算方法,扫描获取了某种型号柴油机缸盖的三维形貌点云数据,在此基础上设计算法从中提取出气道口的中心坐标,测量精度较高。采用逆向工程软件对工件进行了表面重构,结果与实际表面特征信息吻合良好。 相似文献
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一种由便携式三维激光扫描仪和六自由度工业机器人组成的机器人-三维扫描系统可以多角度多方位的获取物体表面的三维信息.针对激光扫描系统和机器人的两种不同组合方式,提出了一种新的确定机器人和激光扫描系统位姿关系的标定方法.该方法使用半径已知的球体作为参照工具,利用扫描系统投射出的线激光与球体的相交线拟合圆来恢复球心以及扫描整个球面拟合球心分别标定了扫描仪与机器人的旋转和平移关系,从而使机器人能够与扫描仪一起完成扫描任务.同时,将该机器人-三维扫描系统应用于工业加工中,可以实现在线测量、加工一体化.使用此系统成功地进行了吉他扫描,并利用得到的扫描数据对吉他进行了精确的边缘加工.实验结果证明,该机器人-三维扫描系统具有测量精度高及稳定性好的特点. 相似文献
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《中国计量学院学报》2020,(1):92-96
目的:为实现低成本、等重量、自动化分割鱿鱼。方法:基于线激光扫描获取的点云,提出了一种结合线激光点云数据分析、表面重建及鱿鱼体积估测等方法的鱿鱼体积分割算法,使用三维激光扫描仪结合LabView获取鱿鱼表面的三维点云数据,为了还原鱿鱼表面形貌,使用阈值分割法去除点云数据里的噪点,根据分割算法确定分割点位置,对鱿鱼产品进行等侧边对角线等重量分割。结果:对角线长度最大误差为0.86%,重量最大误差为0.94%。结论:基于线激光的鱿鱼扫描系统实现了鱿鱼精确分割,符合企业的生产需求,为鱿鱼生产自动化提供了技术支持。 相似文献
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介绍了猫眼光学误差对激光跟踪三维坐标测量系统的影响及猫眼光学误差的主要来源,设计了一种猫眼光学误差的测量原理并构建了相应的测量装置,论述了测量数据处理方法以及在进行激光跟踪三维坐标测量时对猫眼光学误差进行修正的方法.在数据处理过程中,使用了非线性拟合算法来消除半球偏心和安装偏心对测量结果的影响,使用了二维插值算法来获取猫眼在任意入射方位角处的光学误差值.使用所构建的测量装置对Leica公司生产的CER75猫眼的光学误差进行了实际测量并对测量数据进行了处理.实验结果表明,被测猫眼在其接收角范围内的最大光学误差约为4μm. 相似文献
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Rhiannon Batchelor Tobias Messer Marc Hippler Martin Wegener Christopher Barner‐Kowollik Eva Blasco 《Advanced materials (Deerfield Beach, Fla.)》2019,31(40)
The ability to selectively remove sections from 3D‐printed structures with high resolution remains a current challenge in 3D laser lithography. A novel photoresist is introduced to enable the additive fabrication of 3D microstructures at one wavelength and subsequent spatially controlled cleavage of the printed resist at another wavelength. The photoresist is composed of a difunctional acrylate cross‐linker containing a photolabile o‐nitrobenzyl ether moiety. 3D microstructures are written by photoinduced radical polymerization of acrylates using Ivocerin as photoinitiator upon exposure to 900 nm laser light. Subsequent scanning using a laser at 700 nm wavelength allows for the selective removal of the resist by photocleaving the o‐nitrobenzyl group. Both steps rely on two‐photon absorption. The fabricated and erased features are imaged using scanning electron microscopy (SEM) and laser scanning microscopy (LSM). In addition, a single wire bond is successfully eliminated from an array, proving the possibility of complete or partial removal of structures on demand. 相似文献
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《工程(英文)》2018,4(6):796-805
This paper presents a dual-platform scanner for dental reconstruction based on a three-dimensional (3D) laser-scanning method. The scanner combines translation and rotation platforms to perform a holistic scanning. A hybrid calibration method for laser scanning is proposed to improve convenience and precision. This method includes an integrative method for data collection and a hybrid algorithm for data processing. The integrative method conveniently collects a substantial number of calibrating points with a stepped gauge and a pattern for both the translation and rotation scans. The hybrid algorithm, which consists of a basic model and a compensation network, achieves strong stability with a small degree of errors. The experiments verified the hybrid calibration method and the scanner application for the measurement of dental pieces. Two typical dental pieces were measured, and the experimental results demonstrated the validity of the measurement that was performed using the dual-platform scanner. This method is effective for the 3D reconstruction of dental pieces, as well as that of objects with irregular shapes in engineering fields. 相似文献
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Richard Stevens 《成像科学杂志》2013,61(2):117-119
AbstractA calibration and three-dimensional (3D) reconstruction method is presented based on images reflected from planar mirrors and acquired with one camera. The geometric model of the camera–mirror set and a method of calibrating it are described. The calibration technique computes the model parameters using linear equations, and it is proved that the calibration is possible with the knowledge of only six 3D points. The reconstruction method is based on a volumetric representation. The 3D reconstruction is based on a space carving algorithm and the calibration method described in the paper. The results of the calibration and reconstruction method show the efficiency of both techniques. This set-up enables a simple and inexpensive multi-ocular system to be built to recover the 3D structure of volumes. 相似文献
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三维内曲面轮廓非接触式激光扫描图象测量 总被引:1,自引:0,他引:1
三维内曲面轮廓的非接触式精密测量是计测领域中的一个难题。本文基于光机电一体化的思想,针对非球型回转体内轮廓的非接触式测量,提出了激光扫描图象测量法,论述其测量原理,介绍了测量系统的特点和组成.对这一技术的研究.将有助于零件的在线非接触式测量,尤其是在恶劣的工业环境下的测量,以及计算机集成制造技术(CIMS)的发展 相似文献