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    • 3. 发明授权
    • Non-contact flaw detection for cylindrical nuclear fuel pellets
    • 圆柱形核燃料颗粒的非接触式探伤
    • US5309486A
    • 1994-05-03
    • US975050
    • 1992-11-12
    • John C. LichauerLawrence J. ZanaNicola G. ArliaJohn M. BeattyHassan J. Ahmed
    • John C. LichauerLawrence J. ZanaNicola G. ArliaJohn M. BeattyHassan J. Ahmed
    • G01B11/30G01N21/88G01N21/89G01N21/952G06T1/00G06T5/20G06T7/00G21C17/06G21C17/00
    • G06T7/001G01N21/8851G01N21/952G06T7/602G21C17/06G06T2207/20192G06T2207/30164G21Y2002/204G21Y2002/205G21Y2002/206G21Y2004/30G21Y2004/401
    • A non-contact surface flaw detection system for workpieces such as nuclear fuel pellets transports the pellets continuously along an illuminated path while rotating them. A line scan camera records a series of line scans for the pellets and the resulting values of pellet reflectivity are digitized. Pixel values are compared to thresholds defined adaptively by averaging and/or using a video finite impulse response filter, to generate a binary map of "good" and "bad" pixels, that also defines the edges of the pellet in the map. A processor counts and associates bad pixels to logically define and assess blobs of bad pixels. The processor checks for coincidence of the edge pixels with a nominal edge line that best fits the edge, for finding edge flaws. The pellets assessed in this manner are selected or rejected. Camera sensor elements are normalized for gain and offset. Shifting of the pixel data cancels skew produced in scanning moving pellets. Convolution filters cancel isolated bad pixels and enhance contrast at the edge. For processing adjacent areas, the pixel image of the pellets can be tiled, flaws bridging the tile boundaries being assessed as a single blob. The apparatus is preferably arranged for parallel pipeline processing for sidewall and edge defects and can be embodied in a series of modular VME boards.
    • 用于诸如核燃料颗粒的工件的非接触表面探伤系统在旋转它们的同时沿着照明路径连续地输送颗粒。 线扫描相机记录了一系列针对粒料的线扫描,并将得到的颗粒反射率值数字化。 将像素值与通过平均和/或使用视频有限脉冲响应滤波器自适应地定义的阈值进行比较,以生成也定义了地图中颗粒边缘的“好”和“坏”像素的二进制图。 处理器计数并关联不良像素以逻辑地定义和评估坏像素的斑点。 处理器检查边缘像素与最适合边缘的标称边缘线的一致性,以发现边缘缺陷。 以这种方式评估的颗粒被选择或拒绝。 摄像机传感器元件对增益和偏移进行归一化。 像素数据的移动消除了在扫描移动小球中产生的歪斜。 卷积滤波器消除了孤立的不良像素,增强了边缘的对比度。 为了处理相邻区域,颗粒的像素图像可以被平铺,桥接瓦片边界的缺陷被评估为单个斑点。 该装置优选地设置成用于侧壁和边缘缺陷的并行管线处理,并且可以体现在一系列模块化VME板中。