在生物组织中都存在大量的纤维状结构, 散射光的偏振态反映了组织对偏振光的作用, 可以反映组织结构和类型信息。对偏振光传播行为的了解, 有助于提高偏振门的作用, 开发基于偏振光测量组织结构和病理信息的方法。为了研究纤维状散射体对偏振光的影响, 测量不同偏振方向的线偏振光经过牙齿的象牙质散射后散射光的分布和偏振变化, 透射光强度分布为各向异性, 在沿着象牙质中的细管方向透射光较强, 散射光沿细管方向传播较远。透射光的偏振状态与入射光偏振方向有关, 象牙质具有各向异性的光学性质。采用圆柱体散射模型模拟了纤维状散射体对光的散射作用, 结果表明有序排列的纤维结构不仅影响散射光的分布, 而且对光的偏振态也有重要影响。

Many biological tissues consist of fibril structures. The scattered light of tissues provides abundant information about the properties of tissues. The polarization property of scattered light can reveal structure and type of tissue. Understanding the propagation property of polarirzed light in scattering medium is helpful to improve imaging gating method and diagnosis technology. In this paper, the transmitted light from a section of dentin was measured. A linearly polarized He-Ne laser beam was incident on the sample, and the transmitted light is recorded. The image showed anisotropic spatial distribution, indicating the light propagating along the fibers. The polarization property of the scattered light was related to the polarization direction of the incident light. A Monte Carlo simulation considering cylindrical scatterers was utilized to model the scattering property of microstructure in dentin. The experimental results are compared with the simulation. The ordered fibers have influence on the spatial distribution and the polarization state of scattered light.