风洞通用压力扫描阀综合数据采集系统的设计与实现

为了满足风洞中常用压力扫描阀的数据采集要求,设计了一套风洞通用压力扫描阀综合数据采集系统。本文首先对风洞压力扫描阀数据采集系统的结构组成以及常用的压力扫描阀进行了概述。其次,详细的给出了本系统的设计思路、系统组成以及实现方法。最后,使用本系统分别对两台DSA 3217、两台PSI 9116、一台DSA 3217和一台PSI 9116三种情况进行压力测试,测试结果表明,三种情况的数据差异都比较小,分别为3.2Pa、1.6Pa、9.9Pa,同时,数据时间差最大值也很小,分别为5ms、8ms、30ms。由此,可以说明本系统具有很好的同步性与兼容性,能够实现风洞中的各类压力扫描阀的综合数据采集。     

ARRILASER与数字电影

激光是胶片记录的理想光源,激光产生高能量的单色光。ARRILASER的设计概念为:气体激光胶片记录仪的高质量图像和快速扫描+CRT胶片记录仪的耐用+合理的价格。基于其优异的质量、快速和合理的价格,ARRILASER将开创一个数字胶片记录的新局面。     

Development of XY scanner with minimized coupling motions for high-speed atomic force microscope

The design and fabrication processes of a novel scanner withminimized coupling motions for a high-speed atomic force microscope (AFM) were addressed.An appropriate design modification was proposed through the analyses of the dynamic characteristics of existing linear motion stages using a dynamic analysis program,Recurdyn.Because the scanning speed of each direction may differ,the linear motion stage for a high-speed scanner was designed to have different resonance frequencies for the modes,with one dominan...     

镜架扫描仪机电系统的设计

在数控镜片磨边系统中，镜架扫描仪是重要的组成部分，其作用是对眼镜镜圈轮廓进行扫描测量，为镜片加工提供基本数据。文中介绍了镜架扫描仪的测量原理，并给出了某型扫描仪机械结构和控制系统软硬件的设计方案。     

STL File Generation with Data Reduction by the Delaunay Triangulation Method in Reverse Engineering

Reverse engineering has been widely used for the shape reconstruction of an object without CAD data and typical steps include the scanning of a clay or wood model and the generation of manufacturing data such as an STL file. A new approach to remove point data with Delaunay triangulation is introduced to deal with the size problems of the STL file and the difficulties in the operation of the rapid prototyping (RP) process. The selection of a group of triangles, based on the angle, is used for a robust and reliable implementation of the Delaunay triangulation method. The developed software enables the user to specify the criteria for the selection of the group of triangles by the angle between triangles, the percentage of reduced triangles, and the allowable area. This approach can be used to reduce the measuring data from the laser scanner, thus save the handling time of point data during the modelling process and is useful for verifying and slicing the STL model during the RP process.     

An approach for real world data modelling with the 3D terrestrial laser scanner for built environment

Capturing and modelling 3D information of the built environment is a big challenge. A number of techniques and technologies are now in use. These include EDM, GPS, and photogrammetric application and also remote sensing applications. In this paper, we discussed 3D laser scanning technology, which can acquire high density point data in an accurate, fast way. Besides, the scanner can digitize all the 3D information concerned with a real world object such as buildings, trees and terrain down to millimetre detail Therefore, it can provide benefits for refurbishment process in regeneration in the Built Environment.

A series of scans externally and internally allows an accurate 3D model of the building to be produced. This model can be sliced through different planes to produce accurate 2D plans and elevations. This novel technology improves the efficiency and quality of construction projects such as maintenance of buildings or group of building that are going to be renovated for new services in the Built Environment. In addition, the laser scanner technology can be used in integration with differential GPS for terrain modelling for the analysis and inspection of terrain structure accurately.

In this paper, two case studies are introduced to demonstrate the use of laser scanner technology in Built Environment. These case studies are the Jactin House Building in East Manchester and the Peel building in the campus of University Salford. Through these case studies, while use of laser scanners are explained, the integration of it with various technologies and systems are also explored for professionals in both Built and Natural Environment.     

三维激光扫描仪点云数据在AutoCAD中的处理

详细介绍了Cyra三维激光扫描系统获取的点云数据在AutoCAD中的处理过程,重点介绍了坐标纠正和进行三维建模的方法与技巧,总结了AutoCAD在三维建模方面的优点,并针对一些处理中的问题提出了一些解决的办法。     

扫描器布置方式对智能雷扫描轨迹的影响

为了在不改变智能雷子雷本体结构的情况下扩大其扫描面积,进而增大攻击范围,提出了一种新型扫描器布置方式.先应用高等动力学原理建立所需的坐标系,并为获得飞行扫描轨迹,推导出子雷飞行的六自由度弹道方程.然后通过空间解析几何方法获得子雷扫描器在地面的扫描轨迹方程.采用四阶龙格-库塔算法,将数学模型转换为可仿真的离散模型,并利用Matlab进行计算机仿真.最后将新型扫描器布置方式得到的扫描轨迹与传统的布置方式得到的轨迹进行对比.结果表明,新轨迹扫描圆的横向幅度和对目标的捕获概率更大,新型扫描器布置方式能够增大智能雷攻击范围.     

扫描探针显微镜单管式扫描器结构误差的研究

单管式扫描器的结构误差是影响扫描探针显微镜测量精度的主要误差因素之一。本文对单管式扫描器的结构误差,主要包括交叉耦合误差、非正交误差以及扫描器形状误差,进行了实验和理论研究,并提出了一些相应的补偿措施。     

CIE DE2000在彩色扫描仪特征化色差评价中的应用

采用支持向量回归机(SVR)建立了RGB色空间到CIE Lab色空间的转换模型,分别采用CIE DE2000与CIE 1976L*a*b*色差公式对模型精度进行色差计算。采用CIE DE2000色差公式得到的测试组色差平均值、最大和最小值分别为2.659 7,5.219 4和0.206 5,采用CIE 1976L*a*b*色差公式得到的测试组色差平均值、最大和最小值分别为2.865 6,5.879 1和0.376 9。实验结果表明,CIE DE2000与CIE 1976L*a*b*色差公式计算的色差值基本一致,均符合彩色扫描仪特征化精度要求,可将CIE DE2000色差公式用于扫描仪特征化管理中。