共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
3.
4.
铜及铜合金板带材分条变形测量方法探讨 总被引:5,自引:0,他引:5
路俊攀 《理化检验(物理分册)》2004,40(3):132-134
针对铜及铜合金板带材经加工和分切后会不同程度地产生残余应力,引起加工制品的形状及尺寸变化,而测量板带材残余应力的方法如X-ray法和钻孔法等,因有各自的局限性而难以在普通企业实现,介绍了SEMI和JBMA推荐的分条变形测量方法,并对刻蚀程序、测量过程以及存在的有关问题进行了研究,给出一组实测数据。 相似文献
5.
针对螺纹几何参数测量过程中,传统人工测量效率低、仪器昂贵、耗时费力、偶伴有人为误差等不足.本研究采用非接触测量的方法,利用计算机视觉的图像处理技术,通过系统标定、图像采集、图像预处理、边缘检测、几何参数计算等步骤,实现了对螺纹几何参数的自动测量.通过大量实验证明,该系统具有快捷高效、数据可靠、易于操作、替代传统人工操作... 相似文献
6.
提出了一种基于图像处理技术的人体手指甲襞微血管管袢直径的测量方法,采用显微光学放大系统及CCD数字图像采集系统拍摄人体微血管图像,在对采集的图像进行二值化的前提下利用Hessian矩阵提取了微血管的轮廓和中心线,并分段拟合了该中心路径的垂线,计算了轮廓边缘与垂线的交点,最终得到了微血管直径分布图。该方法与其他测量结果相比具有更高的测量精度,并且具有实时、快速等优点。 相似文献
7.
8.
本文作者通过对变形测绘的具体分析,内容包括检测方案的确定,位移监测点的布设等点,将变形测绘作为为重点论述点,通过具体的操作性分析达到对工程标准的严格把握,以期为工程测绘提供重参考价值。 相似文献
9.
图像处理在微小尺寸测量中的应用研究 总被引:1,自引:0,他引:1
介绍图像测晕系统的基本原理和结构,以及在微小尺寸测量中常用的罔像处理方法和步骤.采用在灰度图像下利用罗森菲尔德算法直接提取边缘,避免设定阈值所带来的误差影响,并利用准则剔除粗大误差.最后通过实例来验证了该方法是可行的. 相似文献
10.
变形测量中的数字散斑相关方法 总被引:1,自引:0,他引:1
在对数字散斑相关方法进行理论分析的基础上,导出了测量物体表面变形场的一般过程,并根据以上理论设计、搭建了系统的软件和硬件。初步的实验结果表明,该方法是一种实用的快速、高精度的位移、应变测量方法。 相似文献
11.
12.
介绍了多普勒全场测速技术(DGV)图像及数据处理的方法和过程.图像处理过程中,经背景去除、灰度校正、几何校正等,能够有效滤除实验环境中的背景光,修正不同相机之间感光度不同的影响,校正流场区域在图像中的几何形状的形变.针对转盘测速实验图像进行处理,得到的速度分布与实际速度分布吻合较好,证明所采用的方法是可行的. 相似文献
13.
14.
A method to measure the deformation and fracture of fibers on the fracture surfaces of fiber reinforced composite (FRC) is developed by reconstructing a 3-D image from a stereograph. The method proposed in this article integrates image processing techniques of thresholding, vectorization, matching, and 3-D analysis. The accuracy of the measured result obtained by this method is evaluated by the comparison between the calculated fiber length and the real length, calculated with the help of a micrometer caliper. From the comparison, it is confirmed that the fiber length is calculated with high accuracy, if the occlusion problem does not occur. 相似文献
15.
小波变换在图象边缘提取中的应用 总被引:15,自引:2,他引:15
详细介绍了小波变换在图象边缘提取中的优越性,在参考大量文献的基础上,小结中出常用于边缘提取的小波函数及其提取的边缘的方法与效果。得出在图象边缘提取中高斯函数一阶导数是一种常用的且较有效的小波函数最后给出用高斯函数一阶导数对静态物体边缘提取的计算机模拟。 相似文献
16.
A methodology for automatic measurement of surface tension of liquid metals is presented. The procedure involves the digitization of a television image of a drop of the liquid metal, image processing to obtain the real coordinates of the drop profile, and a final computation of the drop surface tension by a nonlinear regression technique. The method is faster and more reliable than other classical methods, and yields results that are reproducible and as precise as those obtainable by non-automatic procedures. An important feature of this approach is that it can be used for metallurgical tests to check the quality of an alloy during its production, or to provide surface tension data in non-equilibrium processes. 相似文献
17.
光电信号分析在宇宙线观测研究中的应用 总被引:2,自引:0,他引:2
介绍了在宇宙线在面观测系统中经常使用的一种探测器-塑料闪烁体探测器。这种探测器的主要优点是工作稳定、易于长时间野外观测,便于维及造介低廉,其基本功能即是产生、收集光脉冲信号并将转换为电脉冲信号。 相似文献
18.
《Advanced Powder Technology》2023,34(11):104199
Achieving our emission reduction goals requires the bulk production of carbon-neutral fuels and chemicals, which are catalytically produced through heterogeneous fixed bed chemical reactors. To optimise and scale-up these reactors, accurate and validated Computational Fluid Dynamics (CFD) models are crucial. Of especial importance to CFD simulations is the accurate depiction of the 3D bed structure used during the experimental setup. A direct one-to-one coupling between experiments and simulations can be achieved by scanning the experimental bed using computed tomography and reconstructing the scanned images as a 3D geometry for CFD simulations. However, processing of the scanned images is necessary to minimise highly coarse features that could impact the overall mesh size. A highly poly-dispersed lab-scale fixed bed reactor, previously scanned and analysed, is processed using various image-processing operations. Depending on the number and the crudeness of the processing operations, the bed is progressively deformed, which impacts both its porosity and its interparticle pore connectivity. The impact of image-processing becomes more evident when the hydrodynamic behaviour, i.e., X-, Y-, and Z-velocity and static pressure, of the beds is explored. CFD simulations revealed highly heterogeneous flow profiles, with the maximum velocity reached being 16-times higher than the average superficial velocity within the bed. Moreover, small modifications in local topological features introduce significant changes to the flow profiles, while the 3D pore interconnectivity was seen to play an equally important role as the interparticle porosity. A particle size study revealed that large particles form less interconnected networks with higher pore volumes, which significantly reduce the flow velocity and the pressure drop experienced by the flow. The generated results yield key insights towards a deeper understanding of the behaviour of fixed bed chemical reactors, highly valuable for catalyst and reactor engineering. 相似文献
19.
Azriel Rosenfeld 《Sadhana》1983,6(2):145-152
Image analysis techniques applicable to remote sensing data are reviewed, with emphasis on recent developments. The topics
covered include image modelling, feature detection, segmentation and classification, texture analysis, and matching. 相似文献
20.
在图象处理系统中,处理速度是很重要的技术指标。本文介绍了一种采用求和投影法进行的预处理方法,在处理速度方面得到了很大的提高,取得了比较理想的效果. 相似文献