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Full-Text Articles in Engineering
Surface Mapping And Automatic Tool Path Generation, Labiche Ferreira
Surface Mapping And Automatic Tool Path Generation, Labiche Ferreira
Retrospective Theses and Dissertations
With the use of machine vision systems in the manufacturing cycle of a product, the lead time for producing the final product has been substantially reduced. Efforts in the past have aimed at automating the tasks right from the drawing board stage to final production of the product. Such technologies include CAD, CAM, and CAPP. However the task of tool path (NC code) generation has not yet been fully automated. In the current techniques, the user plays a crucial role in the NC code generation process. There is an increasing trend for using machine vision systems in the fabrication of …
Photorefractive Materials For Optical Signal Processing, William B. Lawler
Photorefractive Materials For Optical Signal Processing, William B. Lawler
Retrospective Theses and Dissertations
The optical response of the photorefractive crystals KNbO3:Ta, KNbO3:Fe, LiNbO3:Fe, and nominally pure BaTiO3 is investigated. In the experiment, a holographic grating is built in the crystal under investigation via a two-wave mixing scheme that utilizes the signal-processing capacities of two acousto-optic Bragg cells. The dynamic interaction of the Bragg cells with the photorefractive grating causes a heterodyned RF signal to appear on the output laser beam, enabling the real-time, direct measurement of the amplitude and phase of the space-charge fields in the crystal. Experimental results are presented for the amplitude and phase …