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相邻金属孔间壁厚现场检测系统关键技术的研究 总被引:1,自引:1,他引:0
相邻金属孔间的壁厚测量以往都是根据镗床加工过程中的进刀量计算得出,精度较低.本文提出了一种应用电容传感器对两个金属孔间壁厚在线检测的系统.基于电容传感器,研究了电容测头的电场边缘效应的影响及保护环的宽度选择,设计了测量孔壁的电容测厚传感器进行差动测量.系统由两个距离确定的电容差动测厚传感器、测量电路、A/D接口及软件组成的.对壁厚2 mm,孔径3 mm的相邻金属孔壁厚的测量实验显示,误差达到0.3 μm.系统属于非接触测量,无需修正测头及工件变形误差.此系统测量精度高,测量速度快,操作方便,全套仪器便携,是解决相关壁厚现场精密检测问题的好方法. 相似文献
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<正> 罐头真空度检测是罐头生产中的重要环节,是区分罐头等级、保证产品质量的重要工序。而目前,我国的食品罐头生产行业大多仍采用原始的人工打检的方法来检查罐内真空度。人工打检,劳动强度大,检测速度慢,而且检查结果因人而异,包含较大的主观成分,准确性较差,不能保证产品的质量。这在食品罐头生产行业是一个急待解决的问题。 相似文献
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在大范围距离和方位的测量中,光学传感器因能快速给出准确的结果而被广泛应用;这里介绍的是一种基于三角测量原理的光学排列传感器;该传感器使用的是3个激光二极管和一个位置感应探测(PSD)照相机,主要用于测量相对于被测物体表面的距离和方位;实验结果得出的最初原形显示距离的精确性大约是0.05mm,方位的精确度为0.1°,测量范围为60~750mm;这种传感器具有测量范围大、精度高,且能工作于条件苛刻的环境等优点。 相似文献
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余敢为 《计算技术与自动化》1993,12(4):62-65
1 概述智能真空测试仪是一种以单片机8031为主处理机的测试真空度的智能仪器,具有以下功能与特点:(1)将模拟量转化为数字量进行处理和显示;(2)实现调零、校正、测量,量程转换的自动化;(3)电离规发射电流和热偶规加热电流的自动调节和稳定;(4)一仪多用; 相似文献
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在最近召开的全国轻工系统微机应用技术交流会上,无锡轻工业学院推出一种电脑控制罐头杀菌测试仪。这种仪器由微机、键盘、传感器、采样、显示、打印、报警等部分组成。在电脑控制下,可为不同品种罐头合理制订杀 相似文献
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为了提高清淤准确度,使用光电传感器和压力传感器以及相应的调理电路,采用上位机控制下位机的方式,研制出一种能够同时测量浮泥层密度和相应的液位以及淤泥底部的集成化探测仪。通过实验对传感器进行了标定。测量结果可以在上位机软件界面实时显示并与时间一起保存在上位机上。在软件界面可以修改系数对传感器进行校准。实际应用表明:该探测仪测量准确,实时性好,使用方便,能够起到指导清淤的作用。 相似文献
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Kazunori Sakurama Yusuke Kosaka Shin-ichiro Nishida 《International Journal of Control, Automation and Systems》2018,16(1):16-26
This study deals with the formation control problem of swarm robots using position sensitive detector (PSD) proximity distance sensors based on light-emitting diodes (LEDs). These proximity distance sensors are lightweight and quickly responsive, and are expected to enhance the mobility and flexibility of swarm robots. However, as each sensor has a narrow detection angle, the formation control problem becomes more difficult than when wide-directional distance sensors (such as cameras and laser rangefinders) are used. To overcome this difficulty, we design a two-part motion controller that controls both position and attitude. The attitude controller is necessary for continuous detection of other robots through the narrow detection angles. The designed controller is distributed in the sense that it requires only information on measured values of each robot’s own sensors. Next, we derive an appropriate sensor arrangement (positions and detection angles) that achieves the desired formation pattern. Finally, the effectiveness of the proposed method is demonstrated in an experiment performed by six omni-wheeled robots equipped with LED-based PSD proximity distance sensors. 相似文献
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王丽芳 《计算机工程与应用》2012,48(9):208-210,241
在锥束工业CT系统中,通常要求射线源焦点、物体旋转中心、平板探测器中心三点在一条直线上,与平板探测器垂直。由于机械的定位误差,探测器定位后会出现一定角度的倾斜现象,如果直接利用平板探测器倾斜后采集的投影数据进行重建,重建结果将会出现偏离,产生伪影。针对该问题,利用系统标定的方法测得探测器倾斜角度,利用机械校正对其进行粗调,利用提出的基于探测器倾斜的FDK修正算法进行微调,经过两次校正可以有效抑制由于平板探测器倾斜造成的伪影,通过实验验证了该方法的可行性。 相似文献
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Target detection in clutter is a fundamental problem in radar signal processing. When the received radar signal contains only few pulses, it is difficult to achieve a satisfactory performance using the traditional detection algorithm. In recent times, a generalized constant false alarm rate (CFAR) detector on the Riemannian manifold of Hermitian positive-definite (HPD) matrix was proposed. The employment of this detector, which compares the Riemannian distance between the covariance matrix of the cell under test (CUT) and an average matrix of reference cells with a given threshold, has significantly improved the detection performance. However, the application of this detector in real scenarios is still limited by two problems; it is computationally expensive and the detection performance is not very good since the Riemannian distance is utilized. In this paper, the symmetrized Kullback–Leibler (sKL) and the total Kullback–Leibler (tKL) divergences, instead of the Riemannian distance, are used as dissimilarity measures in the matrix CFAR detector. According to sKL and tKL divergences, three average matrices, the sKL mean, the sKL median, and the tKL t center, are derived. Furthermore, the relationship between the detection performance and the anisotropy of the distance measure used in the matrix CFAR detector is explored. Numerical experiments and real radar sea clutter data are given to confirm the superiority of the proposed algorithms in terms of the computational complexity and the detection performance. 相似文献
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Mang-Hui Wang 《Neural Networks, IEEE Transactions on》2005,16(6):1352-1361
A supervised learning pattern classifier, called the extension neural network (ENN), has been described in a recent paper. In this sequel, the unsupervised learning pattern clustering sibling called the extension neural network type 2 (ENN-2) is proposed. This new neural network uses an extension distance (ED) to measure the similarity between data and the cluster center. It does not require an initial guess of the cluster center coordinates, nor of the initial number of clusters. The clustering process is controlled by a distanced parameter and by a novel extension distance. It shows the same capability as human memory systems to keep stability and plasticity characteristics at the same time, and it can produce meaningful weights after learning. Moreover, the structure of the proposed ENN-2 is simpler and the learning time is shorter than traditional neural networks. Experimental results from five different examples, including three benchmark data sets and two practical applications, verify the effectiveness and applicability of the proposed work. 相似文献
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曹晶秀 《计算机测量与控制》2012,20(1):288-290
提出一种通过多传感器信息融合技术来提高灭火机器人的火焰、距离检测的准确性,设计了由超声波、红外测距模块和数据融合模块组成的测距避障子系统;由红外火焰检测模块、数据融合模块组成的火焰检测子系统,在此基础上,采用自适应加权数据融合算法分别对多传感器检测的距离和火焰信息进行融合,以提高对火源目标判断的准确度;实验结果表明,设计的智能灭火机器人传感器软硬件系统测量相对误差小,能很好的反映火灾现场信息,满足火情探测和灭火需要,具有很强的使用价值。 相似文献
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图象配准是图象融合的一个重要步骤,为此提出了一种自动图象配准算法,该算法从两幅待配准的图象中分别抽取特征点,然后选用Hausdorff距离对两特征点集进行匹配,得到点集间的仿射变换,从而实现图象的自动配准,此算法以特征点而不是物体边缘计算仿射变换,大大降低了计算Hausdorff距离的运算量;同时,基于Hausdorff距离的图象匹配只需要点集之间的对应,而无须点与点的对应,因而可以使用于存在较大物体形变的情况,即完成两幅差异较大图象的配准,实验结果证明了算法的有效性。 相似文献