Bulg. J. Phys. vol.43 no.3 (2016), pp. 215-223

Continuous Laser Beam Based Optical Detection of Ingredients in Highly Scattering Media

L. Gurdev, T. Dreischuh, O. Vankov, E. Toncheva, L. Avramov, D. Stoyanov
Institute of Electronics, Bulgarian Academy of Sciences, Sofia 1784, Bulgaria
Abstract. Some preliminary experiments have been performed concerning the possibility of single-sided optical detection of characteristic inhomogeneities (ingredients, e.g., ill places in tissues) hidden in highly-scattering homogeneous host media (e.g., healthy tissues) irradiated by a collimated cw laser beam. The detection is based on comparative analysis of the backscattered-light intensity distributions over the entrance /exit plane of the medium obtained in the presence and absence of ingredients. The obtained experimental results show that inhomogeneities whose contrast exceeds the measurement signal-to-noise ratio can be distinguished at depths of the order of several transport mean free paths of the photon in the scattering medium. The transversal (with respect to the sensing beam) distinguishability distance turns out to be of the same order. The results of the work are physically viewable and interpretable, but a more rigorous substantiation of them is desirable based on appropriate theoretical models.

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