Print Email Facebook Twitter Scatterers shape effect on speckle patterns Title Scatterers shape effect on speckle patterns Author Denisenkov, V.S. Kiyko, V.V. Vdovin, G.V. Faculty Mechanical, Maritime and Materials Engineering Department Delft Center for Systems and Control Date 2015-12-31 Abstract Laser speckle analysis is a very powerful method with various existing applications, including biomedical diagnostics. The majority of the speckle applications are based on analysis of dependence of scattered light intensity distribution from sizes of the scattereres. We propose a numerical model of speckle formation in reflected light in one-dimension which shows that properties of the scattered light are strongly dependent on the form of the scatterers. In particular, the dependence of number of speckles from the size of the scatterers was investigated for the light reflected from the surface with varying roughness; the single roughness on the surface was assumed to have the form of one-dimensional ‘pyramid’ with the sides having either linear or parabolic descent from the top of the ‘pyramid’ to the bottom. It was found that for the linear roughness, number of speckles decreased with increase of the roughness size, whereas for the parabolic roughness the number of speckles increased. Results of numerical simulation were compared with experiment investigations of roughness samples (0.5-2.5 ?m) made of glass and copper. Due to different production processes, the glass samples are likely to have the parabolic roughness and copper samples are likely to have the linear roughness. Experiments show that the dependences of number of speckles also have different slopes, the same as in numerical simulation. These findings can lead to new analytical methods capable of determining not only the size distribution of roughness (or scatterers) but also the shape. Subject laser speckleslight scatteringsurface roughness To reference this document use: http://resolver.tudelft.nl/uuid:18589b98-f3e9-49ce-935b-2651cba7c0bf Publisher SPIE ISBN 9781628414233 Source Proceedings of SPIE, International Society for Optical Engineering. Biomedical Applications of Light Scattering IX, edited by Adam Wax, Vadim Backman. Vol. 9333, 933312, 2015 Part of collection Institutional Repository Document type conference paper Rights (c) 2015 SPIE Files PDF 319535.pdf 421.35 KB Close viewer /islandora/object/uuid:18589b98-f3e9-49ce-935b-2651cba7c0bf/datastream/OBJ/view