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    • 31. 发明授权
    • Geometric surface inspection system with dual overlap light stripe
generator
    • 具有双重重叠光条纹发生器的几何表面检测系统
    • US4741621A
    • 1988-05-03
    • US897473
    • 1986-08-18
    • Jeffrey D. TaftJames F. Ellison
    • Jeffrey D. TaftJames F. Ellison
    • G01B11/25G01S17/42G01B11/24
    • G06T7/0057G01B11/25G01S17/42
    • The present invention includes a surface inspection system with a single light source producing two light stripe sheets projected from different angles onto an inspected surface so that a combined light sheet produces a light stripe image with no shadows results. The two light stripe sheets are created by tangentially reflecting a laser beam off of separate cylindrical reflectors. The light stripe is detected by an imaging system, including a camera having a CCD image array, held at a fixed angle with respect to the light sheet which allows the two-dimensional curvature of the stripe to be detected. The two-dimensional light stripe image is converted into a digital image and processed by linear and logical digital filters that narrow the stripe down to two pixels wide. A coordinate extraction apparatus extracts the coordinates of the bottom row of the pixel image producing a digital representation of the light stripe curve. The sample curve is compared by a computer with a reference curve by obtaining the absolute value of the difference in height of points along the sample and reference curves after alignment and comparing the absolute value to an error or tolerance threshold. Any deviation beyond the fixed tolerance is reported as a surface irregularity defect.
    • 本发明包括具有单个光源的表面检查系统,其产生从不同角度投影到被检查表面上的两个光条片,使得组合的光片产生不产生阴影的光条纹图像。 通过将激光束切向反射离开单独的圆柱形反射器来产生两个光条带片。 该光条由成像系统检测,该成像系统包括具有CCD图像阵列的照相机,该相机具有相对于允许检测条纹的二维曲率的光片固定的角度。 将二维光条纹图像转换为数字图像,并通过将条纹缩小到两个像素宽的线性和逻辑数字滤波器进行处理。 坐标提取装置提取产生光条纹曲线的数字表示的像素图像的底行的坐标。 通过计算机与参考曲线比较样本曲线,通过获得沿着样本的点的高度差和对准后的参考曲线的绝对值,并将绝对值与误差或公差阈值进行比较。 超出固定公差的任何偏差都报告为表面不规则缺陷。