玻璃微珠球度自动测试

将现代光学测试技术、计算机技术和光电子技术相结合, 研究了基于面阵CCD,成像物镜和微机的微小尺寸检测系统, 实现了二维尺寸的高精度、非接触、实时自动检测。系统结构简单, 易于操作, 对环境要求宽松。为实现二维尺寸的非接触自动检测, 需要获得被测工件的边缘轮廓参数。解决了非线性平滑、阈值确定和边缘提取等关键技术, 利用边缘轮廓跟踪的方法获取工件的边缘轮廓图像, 系统可精确地确定工件的边缘轮廓曲线。作为实例对微米级玻璃珠的球度进行了测试。该测试系统为非接触式测量, 克服了传统测试方法一些固有的缺点, 不会对工件造成永久性损伤。实验表明该系统测量范围大, 绝对精度达到3.0 μm, 重复性好。

Automatic Test of Sphericity for Micro Glass Bead

Modern optical test technique, computer technique and photoelectric technique are combined. A test system with the CCD matrix, imaging objective and computer is researched to realize 2-D high accuracy, non-contact, real time and automatic measurement. The system has a simple structure and can be easily operated without the strict requests for environment. We need to obtain the edge contour parameter of the measured workpiece in order to achieve non-contact and automatic measurement. The testing device solves the key technologies of non-linearity smooth, the threshold value selection and edge abstraction. Because the system uses the method of the edge contour track to obtain the edge contour image of workpiece, the edge contour curve of workpiece can be precisely determined. Sphericity of micro glass bead is tested as an example. The testing system adopts non-contact test and overcomes some inherent disadvantages of the traditional testing method. The system will not cause permanent damage to the workpiece. The experiments show that the testing range is large, the absolute accuracy is less than 3 μm with good repeatability.