Browsing by Author "Soares, O. D. D."

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    Surface inspection via projection interferometry
    Wygant, R. W.; Almeida, S. P.; Soares, O. D. D. (Optical Society of America, 1988-05)
    Projection fringe interferometry provides a useful technique for nondestructive surface analysis. Two beam interferometric fringes were projected onto a block of aluminum whose surface had various types of grooves cut into it. The fringes were digitized and analyzed via an automatic fringe tracking algorithm. Three-dimensional topographical maps of the surface's microstructure are presented together with a statistical analysis of surface parameters including average roughness, height distributions, and the autocorrelation function.