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Full-Text Articles in Physics
Generation Of Surface Shape From Variable-Resolution Video Moire Contours, Joel H. Blatt, Scott C. Cahall, Bernard Gilbert, Jeffrey A. Hooker, Gary L. Wallace
Generation Of Surface Shape From Variable-Resolution Video Moire Contours, Joel H. Blatt, Scott C. Cahall, Bernard Gilbert, Jeffrey A. Hooker, Gary L. Wallace
Aerospace, Physics, and Space Science Faculty Publications
Several methods for generation of three dimensional surface shapes from variable resolution video moire contours are described. In a classical moire system, a physical grating is projected on a target and also used to view the target. The moire contours are generated in the plane of the viewing grating. An unambiguous surface shape can then be computed by processing a set of moire images where the grating, target, or both are moved. By using an interferometer to generate and project variable pitch gratings and video technology to generate the moire contours, a 3-D surface can be scanned at different resolutions …
Variable-Resolution Video Moire Error Map System For Inspection Of Continuously Manufactured Objects, Joel H. Blatt, Scott C. Cahall, Jeffery A. Hooker
Variable-Resolution Video Moire Error Map System For Inspection Of Continuously Manufactured Objects, Joel H. Blatt, Scott C. Cahall, Jeffery A. Hooker
Aerospace, Physics, and Space Science Faculty Publications
Moire techniques can be a powerful tool to determine deviation of a manufactured shape from a desired shape. In a traditional moire system, distorted gratings on an object are viewed through an undistorted grating. The moire contours that result represent equal depth contours over the entire viewed surface. By generating the moire patterns in video, it is possible to view the distorted gratings on a test object through a set of gratings that has been distorted by a similar but perfect object. The output is then a set of moire contours that corresponds to the differences between the two surfaces. …
Real-Time Generation Of Intersection Of Surfaces For Welding By Video Moire, Scott Christian Cahall, Jeffery A. Hooker, Joel H. Blatt
Real-Time Generation Of Intersection Of Surfaces For Welding By Video Moire, Scott Christian Cahall, Jeffery A. Hooker, Joel H. Blatt
Aerospace, Physics, and Space Science Faculty Publications
A common problem in fabrication and welding of complex structures is that there is no simple way to determine where to cut one part so that it will fit another part unless both parts designed and built on a CAD/CAM system. Particularly in prototype or retrofit work, cutting and fitting parts for welding is more of an art than a science. We have developed a unique video moire system that generates the intersection contour in near real time with the contour superimposed on a video image of the part, allowing the cut line to be marked while following the contour …