共查询到18条相似文献,搜索用时 362 毫秒
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介绍了一种新型的基于垂直扫描的精密三维工作台,它由一个自带计量系统的二维工作台和一个垂直扫描工作台组成。垂直扫描工作台放置在X-Y二维工作台上方。当测量工件时,闭环控制系统控制二维工作台的位移,同时Z方向伺服电机和压电陶瓷驱动器驱动垂直扫描工作台去实现垂直方向上的精确定位。衍射光栅位移传感器用于探测垂直扫描工作台的垂直位移量。 相似文献
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本文介绍了一种以衍射光栅作为计量标准器的垂直方向上的微位移工作台,用来实现在白光扫描干涉轮廓仪的表面形貌测量中Z方向上的精密定位,该工作台实现了轮廓仪的闭环测量和控制,文章重点讲述了光栅信号处理的硬件及软件细分技术,以及压电陶瓷驱动电路的原理和工作台闭环定位控制的流程. 相似文献
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为减小测量误差,设计了基于垂直位移扫描的接触式表面形貌仪。该测量仪以保持杠杆处于平衡位置为测量前提,X_Y向,Z向工作台分别采用衍射光栅为标准器;X—Y向工作台采用直线电机和压电陶瓷分别进行粗、细两级定位,Z向电机采用压电陶瓷驱动微定位。总体论述了该仪器的整体结构、测量原理、工作台的定位控制以及衍射光栅干涉信号的处理等内容。测量结果表明该系统有效地提高了测量精度。 相似文献
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为了克服传统的激光三角非同步物体形貌测量传感器,在深度方向的测量精度和横向测量视场相互制约的固有缺点,设计了一种新型的激光同步扫描物体形貌测量传感器.传感器以激光三角测量法为基本原理,通过所设计的光路系统,实现激光投射方向与相机成像方向的同步扫描.本文研制了基于高速旋转的十二面转镜和线阵CCD相机为主体的实验样机,实现了测量深度方向和横向视场的相互独立,并结合精密电控位移导轨和激光跟踪仪等搭建了实验系统平台.在传统非参数标定方法基础上,提出了一种适用于该传感器的映射标定方法,能够准确快速的标定该传感器.系统利用激光跟踪仪进行比对实验验证,结果表明:单点重复性小于0.07 mm,测量精度优于0.25 mm.测量传感器具有精度高、速率快、稳定性好等优点,对于物体表面形貌快速精密测量有着广泛的应用前景. 相似文献
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基于单幅灰度图像的微胶点体积测量 总被引:1,自引:0,他引:1
针对微量布胶情况下布胶量难以有效测量的问题,研究了基于单幅灰度图像还原胶点三维形貌进而进行体积测量的方法;通过建立胶点的光照模型,在一定的约束条件下利用线性迭代算法来求解胶点表面方向,进而对表面方向进行积分获得胶点形貌曲面,并在通过数学形态学获得的胶点覆盖边缘内对表面曲面进行积分,得到胶点的估计体积;仿真与实验表验证了该方法的有效性,结果表明,三维测量比二维测量具有更高的精度,使测量误差从3.76%(二维)降低到1.09%(三维). 相似文献
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《自动化仪表》2021,(3)
在半导体加工检测、微机电系统(MEMS)组装、生物医学、航空航天、量子通信等领域,微结构元器件的应用越来越广泛。要实现微结构元器件的高精度加工,必须建立相应的高精度测量方法。针对微小物体三维形貌测量,提出了一种基于自动聚焦技术的三维测量方法。详述了该方法的测量流程。使用单相机对被测物进行垂直扫描并采集图像序列;通过对序列图像逐一进行清晰度评价计算,依靠精确的聚焦判定确定表面点的高度;通过二维水平扫描测量,获取表面三维轮廓数据。根据所阐述的测量原理,聚焦判定决定了测量精度。通过研究,提出了改进的清晰度评价算法,将改进的Retinex算法与Tenengrad梯度函数相结合,提高了测量方法的适用性和稳定性。利用标准量块台阶进行了精度验证试验,所提方法测量精度优于15μm。该研究为微结构元器件三维形貌测量提供了一种低成本、较高精度的测量方法。 相似文献
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《计算机应用与软件》2017,(9)
针对无线传感器网络中的三维表面覆盖问题,提出一种基于方向梯度的覆盖算法。首先将三维表面垂直投影到二维平面上,然后采用区域离散化的思想,将二维平面离散成若干个网格点,再根据方向梯度概率感知模型,确定每个点覆盖的范围,最后通过贪婪算法找出满足覆盖率的最小覆盖集。该方法采用的方向梯度概率感知模型,充分考虑了三维表面地形的影响以及实际应用中的感知范围衰减因素。通过大量仿真实验表明,该方法能有效覆盖三维区域。 相似文献
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Due to the geometry complexity and high precision requirement, there still possess a lot of challenges in the design, manufacturing and measurement of ultra-precision micro-structured freeform surfaces (e.g. microlens array) with submicrometer form accuracy and surface finish in nanometer range. Successful manufacturing of ultra-precision micro-structured freeform surface not only relies on the high precision of machine tools, but also largely depends on comprehensive consideration of advanced optics design, modelling and optimization of the machining process, freeform surface measurement and characterization.This paper presents the theoretical basis for the establishment of an integrated platform for design, fabrication, and measurement of ultra-precision micro-structured freeform surfaces. The platform mainly consists of four key modules, which are Optics Design Module, Data Exchange Module, Machining Process Simulation and Optimization Module and Freeform Measurement and Evaluation Module. A series of experiments have been conducted to evaluate the performance of the platform and its capability is realized through a trial implementation in design, fabricating and measurement of a microlens array. The results predicted by the system are found to agree well with the experimental results. These show that the proposed integrated platform not only helps to shorten the cycle time for the development of microlens array components but also provides an important means for optimization of the surface quality in ultra-precision machining of micro-structured surfaces. With this successful development of the system, optimal machining parameters, the best cutting strategy, and optimization of the surface quality of the ultra-precision freeform surfaces can be obtained without the need for conducting time-consuming and expensive cutting tests. 相似文献
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Alex Hay-Man Ng Kui Zhang Hsing-Chung Chang Xiaojing Li Chris Rizos 《International journal of remote sensing》2013,34(22):7227-7256
This article presents 3D surface deformation mapping results derived from satellite synthetic aperture radar (SAR) data acquired over underground coal mines. Both ENVISAT Advanced Synthetic Aperture Radar (ASAR) and Advanced Land Observing Satellite (ALOS) Phased Array type L-band Synthetic Aperture Radar (PALSAR) data were used in this study. The quality of the 3D deformation mapping results due to underground mining is mainly limited by two factors. (1) Differential interferometric synthetic aperture radar (DInSAR) is less sensitive to displacement along the north–south direction in the case of the current SAR satellite configurations. (2) The mining-induced displacement is continuous and nonlinear; and the accuracy of the 3D DInSAR measurement is severely affected by the similar but non-identical temporal overlaps of the InSAR pairs. The simulation and real data analyzes have shown that it would be more practical to use DInSAR pairs with the assumption of negligible northing displacement to derive the displacements in the easting and vertical directions. The northing displacement could then be estimated from the residuals. This limitation could be overcome in the future with the launch of more radar satellites, which would provide better viewing geometry. 相似文献
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为了实现对物体运动位移的检测,设计了一种以国产高精度MEMS电容式加速度传感器MSCA3002为核心,24位高精度A/D转换器ADS1255,高性能ARM处理器LM3S2B93为主控制器的位移检测系统,并详细给出该系统的硬件电路及其软件算法设计。系统将传感器检测到的物体运动的加速度,经过积分算法转换为物体运动位移。实验结果表明:系统采样精度高、速度快、误差小,A/D转换器对加速度信号的检测精度能达到0.4%,积分后对位移的测量精度能控制在3%左右,很好地实现了对运动位移的检测。 相似文献
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