Estimation of two-layered media extinction by sapphire fiber probe and diffuse reflectance analysis
Platonova A. A.
1, Zotov A. K.
1, Kochiev D. G.
1, Zaytsev K. I.
1, Kurlov V. N.
2, Dolganova I. N.
1,21Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
2Osipyan Institute of Solid State Physics RAS, Chernogolovka, Russia
Email: platlina.hibou2001@yandex.ru, in.dolganova@gmail.com
Measuring the optical parameters of biological tissues using diffuse reflectance methods is widely used for non-invasive monitoring of various conditions. One particular application is the analysis of the parameters of various volumetric inclusions and tissue layers. For this purpose, this paper examines a sapphire fiber probe that measures an effective extinction coefficient of biological tissue using analysis of spatially resolved diffuse reflectance. It is based on four-channel laser illumination of the object under study and the analysis of diffuse reflected intensity in steady-state mode. To evaluate the probe's sensitivity to inclusions, two-layer polyacrylamide-based phantoms with varying top-layer thicknesses were developed. A lipid emulsion of varying concentrations was used as the scattering component, creating a contrast in scattering properties at the interface between the phantom layers. As a result of experimental studies, it was shown that the measured effective extinction coefficient of such phantoms depends on the thickness of the top layer, and the probe allows estimation of heterogeneity or inclusions. Keywords: diffuse reflectance, effective extinction coefficient, sapphire, tissue phantom.
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