Browsing by Author "Wygant, R. W."

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    Optical Fourier-transform characterization of fish scale age
    Almeida, S. P.; Wygant, R. W.; Jearld, A.; Penttila, J. A. (Optical Society of America, 1987-04)
    Optical Fourier transforms of haddock fish scales were made for fish taken from two different bodies of water. The scales in each group varied in age from 2 to 10 yr. A comparison of the image processed digitized Fourier transforms for the scales was made on a personal computer. Statistical correlation studies of these transforms were performed, and the results show a fairly good age discrimination between the scales in each age group.
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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.