Assessment of multifractal analysis in dynamic laser speckle signals using a spatial light modulator
| Autor: | Ana Laura Vadnjal, Natalia Alvarez, Pablo Etchepareborda, Arturo Bianchetti, Alejandro Federico |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Dynamic speckle
Physics MULTIFRACTAL ANALYSIS Spatial light modulator business.industry Ciencias Físicas SPECKLE Spectral density Multifractal system 01 natural sciences Atomic and Molecular Physics and Optics Light scattering WAVELET LEADERS 010309 optics Speckle pattern Optics Wavelet 0103 physical sciences Speckle imaging SPATIAL LIGHT MODULATOR Electrical and Electronic Engineering business Engineering (miscellaneous) CIENCIAS NATURALES Y EXACTAS Óptica |
| Popis: | We assess and discuss several technical aspects of the multifractal statistical analysis applied to time series of dynamic speckle intensity signals. Due to the complexity of this goal, we implemented an optical setup that mimics the light scattering effect from the illuminated object using a spatial light modulator. The multifractal spectrum of the obtained dynamic speckle intensity signals is quantified by utilizing a mathematical framework based on the decomposition of wavelet leaders’ functions. The propagated light that is scattered utilizing the spatial light modulator verifies the well-known first- and second-order statistics of the obtained speckle images and also a given temporal correlation function determined by a copula algorithm adding several classes of fractional Gaussian noises. To experimentally implement these issues, we load appropriate dynamic temporal phase screens in the spatial light modulator working on phase-only mode and guide the light propagation through an optical setup composed of a 4f correlator. Different types of statistical trends in the scaling properties as a function of frequency sampling, intensity signal discretization, mean size of speckle, temporal correlation length, and vanishing moments of the elected mother wavelet analysis are theoretically and experimentally tested and compared. Fil: Alvarez, Natalia. Instituto Nacional de Tecnología Industrial. Centro de Electrónica e Informática; Argentina. Universidad de Buenos Aires. Facultad de Ingeniería. Departamento de Física; Argentina Fil: Vadnjal, Ana Laura. Instituto Nacional de Tecnología Industrial. Centro de Electrónica e Informática; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Etchepareborda, Pablo Gonzalo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Tecnología Industrial. Centro de Electrónica e Informática; Argentina Fil: Bianchetti, Arturo Abel. Instituto Nacional de Tecnología Industrial. Centro de Electrónica e Informática; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Federico, Roque Alejandro. Instituto Nacional de Tecnología Industrial. Centro de Electrónica e Informática; Argentina |
| Databáze: | OpenAIRE |
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