Scatterers shape effect on speckle patterns

Valentin S. Denisenkov; Vadim V. Kiyko; Gleb V. Vdovin

doi:10.1117/12.2079103

10 March 2015 Scatterers shape effect on speckle patterns

Valentin S. Denisenkov, Vadim V. Kiyko, Gleb V. Vdovin

Proceedings Volume 9333, Biomedical Applications of Light Scattering IX; 933312 (2015) https://doi.org/10.1117/12.2079103
Event: SPIE BiOS, 2015, San Francisco, California, United States

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 μm) 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.

Citation Download Citation

Valentin S. Denisenkov, Vadim V. Kiyko, and Gleb V. Vdovin "Scatterers shape effect on speckle patterns", Proc. SPIE 9333, Biomedical Applications of Light Scattering IX, 933312 (10 March 2015); https://doi.org/10.1117/12.2079103

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