采用数字同步技术的轴类零件尺寸光电检测

根据线阵CCD对二维图像进行扫描检测的特点,提出一种基于数字同步技术的轴类零件尺寸检测方法。它用数字方法保证扫描位移量(或者位移速度)与CCD行扫描次数(或者行扫描速度)严格对应,CCD的行扫描由扫描位移量控制,有效消除了被测物体运动速度变化对检测分辨力和精度的影响,提高了检测精度;采用数字同步技术,使检测在扫描位移的加速、恒速和减速过程中均能进行,提高了检测速度;采用图像边缘自动跟踪方法,自动获取边缘参数,实现被测物体的二维多尺寸自动定位检测。检测实验表明,该方法的检测误差≤0.02mm;当被测物体轴向尺寸为100mm时,检测时间<5s。

Optical-electronic test for shaft part size with digital synchronous techniques

A method for shaft part size detection based on digital synchronous technique is proposed according to the characteristics of scanning 2-D image with linear CCD. Because of controlling CCD line scanning with the scanning displacement, the displacement speed strictly corresponds to line scanning speed of CCD. It effectively eliminates impacts of tested object speed variation upon resolution factor and precision and improves testing accuracy. Testing can be carried out in process of speed-up, constant speed and speed-down of scanning displacement due to adopting the digital synchronous technology, thus raising the testing speed. In addition, by means of automatic tracking for image edge and automatically acquiring edge parameters, automatic positioning and testing of a 2-D object can be performed. The testing experiments show that the testing error is equivalent to or less than 0.02mm. When the axial size of the test object is 100mm, the testing time is less than 5s.