Proceedings PaperTheoretical analysis of speckle-moire based on the study of speckles polarization for multieffect simulated biotissue
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In general, when laser light is incident on biotissue, four interactions can happen: some light is reflected; some of the remaining transmitted light is scattered inside the tissue; some of the light is absorbed; finally, some may be transmitted all the way through the tissue. In the field of speckle metrology for biomedical science, speckle pattern forming by biotissues, such as human skin, sclera, etc., consists of the above first part as well as the second part. The multiple reflection and scattering (multi-effect) occurs, which may cause the polarization state of laser speckles to have some changes. Therefore, it is necessary to pay attention to the properties of polarized laser speckles in biomedical application. Unfortunately, relatively few experimental results are available in the literature since the `speckle' as a key word appeared in 1975. For basic work, we simply make several pieces of ground glasses coated with different thicknesses of white paint as simulated biotissues, i.e., diffusers having multi-effects. Based on the study of speckles polarization for multi-effects, we provided an experimental study of speckle-moire phenomenon previously. In this paper, we present a new concept of paired correlation speckle patterns, and explain the mechanism of moire-specklegram theoretically. Also, speckle-moire phenomenon are further investigated.