Light penetration depth of a turbid media estimated by cross-correlation of speckle patterns

• Autores: Igor S. Sidorov, Serguei V. Miridonov, Ervin Nippolainen, Alexei A. Kamshilin
• Localización: SPECKLE 2012: V International Conference on Speckle Metrology : 10-12 september 2012 : Vigo, Spain / Ángel Manuel Fernández Doval (ed. lit.), María Cristina Trillo Yáñez (ed. lit.), José Carlos López Vázquez (ed. lit.), 2012, ISBN 9780819490902
• Idioma: inglés
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• Resumen

  • We present novel experimental method for estimation of the light penetration depth (LPD) in turbid media based on the analysis of the cross-correlation function of speckle patterns. Under certain illumination conditions, the amplitude of the correlation function is strongly dependent on the penetration depth. Presented theoretical model based on the Bragg diffraction from the thick holograms allows LPD estimation if only one parameter of the material, namely refractive index, of the material is known. However, qualitative LPD comparison is possible without knowledge of the material properties. Feasibility of the method was checked experimentally. Experimental results were additionally verified by alternative experimental method.