公开(公告)号：US5189490A

公开(公告)日：1993-02-23

申请号：US767222

申请日：1991-09-27

Applicant: Devdas Shetty ,  Henry Neault

Inventor： Devdas Shetty ,  Henry Neault

IPC: G01B11/30

CPC classification number: G01B11/303

Abstract: A non-contact visual system for analyzing surface roughness directs onto the surface of a workpiece a laser beam which is reflected from the surface with a diffraction pattern. The image of the reflected diffraction pattern is captured on a mirror and reflected onto a display screen, and this displayed image is converted into analog signals which, in turn, are converted into digital data. The intensity of the captured image is determined from the digital data, and the data on the determined intensity of the captured image are compared with data on intensity from calibrated standards of surface roughness. From this comparison, the surface roughness of the workpiece is determined. The preferred technique uses a rasterizing graphics adapter for converting the output of a video camera into the digital signals and only pixels above a predetermined brightness value are utilized.

Abstract translation: 用于分析表面粗糙度的非接触视觉系统将衍射图案从表面反射的激光束引导到工件的表面上。 反射的衍射图案的图像被捕获在反射镜上并被反射到显示屏上，并将该显示的图像转换成模拟信号，这又被转换为数字数据。 从数字数据确定拍摄图像的强度，并将所确定的拍摄图像强度的数据与来自校准的表面粗糙度标准的强度数据进行比较。 根据该比较，确定工件的表面粗糙度。 优选的技术使用光栅图形适配器将摄像机的输出转换为数字信号，并且仅使用高于预定亮度值的像素。