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Full-Text Articles in Engineering
Photopolarimeter Based On Planar Grating Diffraction, R. M.A. Azzam, K. A. Giardina
Photopolarimeter Based On Planar Grating Diffraction, R. M.A. Azzam, K. A. Giardina
Electrical Engineering Faculty Publications
A division-of-amplitude photopolarimeter (DOAP) is described that employs a diffraction grating in the conventional spectrometer orientation with the grating grooves normal to the plane of incidence. Four coplanar diffracted orders are used for polarimetric analysis to determine all four Stokes parameters of incident light simultaneously and virtually instantaneously (with the speed being determined solely by the photodetectors and their associated electronics); a fifth order is used for alignment by autocollimation or by use of a position-sensing quadrant detector. To sensitize the instrument for the +45° and -45° azimuths of incident linearly polarized light and for the handedness of incident circular …
Acoustical Boundary Location Through Texture Analysis Of Multibeam Bathymetric Sonar Data, Herb Barad, Andrews B. Martinez, Brian S. Bourgeois, Edit J. Kaminsky
Acoustical Boundary Location Through Texture Analysis Of Multibeam Bathymetric Sonar Data, Herb Barad, Andrews B. Martinez, Brian S. Bourgeois, Edit J. Kaminsky
Electrical Engineering Faculty Publications
Texture analysis is performed on multibeam sonar signal returns discriminated angularity by beamforming. A collection of fourteen texture features are computed via co-occurrence matrices and data reduction is then performed using a principal components transformation. Acoustical boundaries (boundaries between regions with homogeneous acoustical properties) are evident from the features. Results indicate that seafloor bottom characteristics can be extracted from these texture features.