Automatic measurement of frontal area and volume of fluted ingots using image-based instrumentation

The development of an image-based measurement system for area and volume estimation is reported here with a novel idea of area projection with partial information. The measurement system has been put into a field trial in one of the Integrated Steel Plants in India. The estimated error was limited to ±0.5% with a high degree of repeatability.     

A novel shape-based coding-decoding technique for an industrial visual inspection system

This paper describes a unique single camera-based dimension storage method for image-based measurement. The system has been designed and implemented in one of the integrated steel plants of India. The purpose of the system is to encode the frontal cross-sectional area of an ingot. The encoded data will be stored in a database to facilitate the future manufacturing diagnostic process. The compression efficiency and reconstruction error of the lossy encoding technique have been reported and found to be quite encouraging.     

反射式光纤位移传感器在测量牙齿咀嚼过程中的应用

反射式光纤位移传感器具有对测量环境的要求低、适用于各种常规方法无法满足的特殊场合、测量范围大和测量精度高等优点.本文简述了该传感器的工作原理,针对牙齿咀嚼过程测量和在口腔中工作的特殊要求设计了专门的光纤头和反射面,建立了一套测量该过程的装置,对该测量系统进行了校准,对牙齿咀嚼过程进行了实时测量,得到了一组人体牙齿咀嚼状况下的实时位移的测量结果,在牙医界第一次实现了牙齿咀嚼过程的动态实时测量.文中讨论了口腔这一特殊的测量环境和一些影响测量精度的因素,在实测中摸索了一些减小误差的方法,最后对测量误差作了分析.     

基于I2C总线的作业面积测量系统的研究设计

当前机械产品在农业作业中得到广泛应用,但缺少一种作业面积测量系统.为此,研制了一种结构简单、操作方便、性能可靠的智能面积测量系统.     

基于HP VEE的超声波塑料焊接温度场检测系统

由于超声波塑料焊接具有升温速度快、局部生热、压力作用的特点使其温度场测量非常困难.文中采用基于HP VEE的温度场测量系统来测量超声波塑料焊接的温度场;并介绍了HP VEE的功能、该温度场测量系统的组成和采用该系统进行的超声波焊接PVC塑料的温度场检测试验.试验表明该系统能够高精度、快速、自动的检测超声波塑料焊接温度场.     

Accuracy assessment of vehicles surface area measurement by means of statistical methods

This paper presents an assessment of the different methods and techniques for measuring a vehicle’s surface area, including a close-range photogrammetric system with calibrated digital cameras, a mid-range laser scanning system and an expeditious method based on a specific tape measurement. These methods are compared with respect to their task-specific accuracy related to the area measurement by means of statistical test for the detection of the significant results. An uncertainty evaluation of these techniques is performed using a standard device that was previously calibrated with a coordinate measuring machine. The assessment of the gathered data reveals a potential for reducing the time and cost associated with close-range photogrammetry for vehicle surface area measurement and digitisation.     

基于三维精密位移工作台的显微图像拼接测量系统

设计了一种大面积无缝无特征显微图像拼接测量系统,该系统基于光学显微系统和大行程纳米级计量型三维精密位移工作台,建立了以测量系统自身的计量系统来标定CCD摄像机和计算CCD与水平工作台夹角的数学模型,解决了一般图像测量系统需借助外部设备进行标定和夹角测量的问题。构建了非正交水平工作台移动策略,用于光学显微图像大面积无缝无特征拼接,减小了拼接量,扩大了横向测量范围,解决了测量视场与横向测量分辨率受限于物镜数值孔径的问题。     

Weighted approach for multivariate analysis of variance in measurement system analysis

In a process that is integral to a measurement system, some variation is likely to occur. Measurement system analysis is an important area of study that is able to determine the amount of variation. In evaluating a measurement system's variation, the most adequate technique, once an instrument is calibrated, is gauge repeatability and reproducibility (GR&R). For evaluating multivariate measurement systems, however, discussion has been scarce. Some researchers have applied multivariate analysis of variance to estimate the evaluation indexes; here the geometric mean is used as an agglutination strategy for the eigenvalues extracted from variance–covariance matrices. This approach, however, has some weaknesses. This paper thus proposes new multivariate indexes based on four weighted approaches. Statistical analysis of empirical and data from the literature indicates that the most effective weighting strategy in multivariate GR&R studies is based on an explanation of the percentages of the eigenvalues extracted from a measurement system’ matrix.     

一种小型高效节水喷灌系统的设计

为提高喷灌系统的节水效果,在深入分析土壤湿度对植物生长影响的基础上,提出了一种小型高效节水喷灌系统的设计.利用土壤湿度实时检测来控制阀门开度,以实现节水的目标.在讨论了可行性、设计价值及控制方法的基础上完成了系统的软硬件设计.系统能够适用于花园、草坪等小范围区域的灌溉,也可应用于温室喷灌.     

轴承保持架计算机视觉检测方法研究

根据铁路轴承保持架的检测要求,研究了基于图像边缘信息的保持架窗孔梁计算机视觉检测方法。根据检测对象的特点,确定了最佳的保持架边缘检测算法。在算法的具体实现过程中,提出了弦长法确定保持架边缘大端外圆圆心、区域划分检测窗孔梁宽度边缘直线等计算方法,实验表明,将计算机视觉引入轴承保持架生产的在线检测成本低、效率高,检测精度满足要求。