Optical High Speed Dimensional Inspection

该项目涉及开发一种实时获取三维距离图像的技术，其精度为0.001数量级。范围图像是指图像中每个像素的值表示从相机焦点到场景中相应点的距离的图像。在这种模式下，每个像素成为一个计时器，它测量从帧的开始到光的扫描平面穿过像素的时间。这个计时信息很容易转换成距离信息。因此，所用的程序在计算上很简单。研究内容包括软件的开发、测量系统的标定和评估，以及利用安装在Stewart平台上的摄像机进行近距离、高速、高精度检测的可行性论证。由于该系统可以实时生成高精度的三维数据，因此它可以潜在地用于各种制造过程的过程控制，从而可以更有效地纠正制造零件中的错误。相机和Stewart平台的结合，如果成功的话，将使实时尺寸检测在许多情况下是可行的，而目前还不实际。

This project concerns the development of a technique for obtaining three-dimensional range images in real-time with accuracies of the order of 0.001. Range image refers to an image where the value of each pixel in the image represents the distance from the camera's focal point to the corresponding point in the scene. In this mode, each pixel becomes a timer which measures the time from the start of the frame until the scanning plane of light crosses the pixel. This timing information is readily converted to distance information. Thus, the procedure used is computationally simple. The research includes development of the software, calibration and evaluation of the measurement system, and demonstration of the feasibility of close-in, high-speed, high- precision inspection using the camera mounted on an available Stewart Platform. Because the system produces high-accuracy three-dimensional data in real-time, it can be potentially used for in-process control for a wide variety of manufacturing processes, so that errors in the parts as manufactured can be corrected more effectively. The combination of the camera and the Stewart Platform, if successful, would make real-time dimensional inspection practical for many cases where it is not practical today.