偏振门用于对散射介质成像的蒙特卡罗模拟研究

通过蒙特卡罗模拟研究偏振光在散射介质中的传播,对通过散射介质的偏振光的强度分布进行模拟,分析了偏振门和空间滤波对成像的影响.模拟结果表明,对于Rayleigh散射体,偏振门与空间滤波可以减小散射光的影响,提高图像对比度,圆偏振光入射比线偏振光具有更高的对比度.对于Mie散射粒子,偏振门的作用有限,不同偏振光的结果差别不大.对双组分的散射介质也进行了模拟,偏振门在这种体系中仍能提高图像对比度.

Polarization Gating Imaging in Turbid Medium: Monte Carlo Simulation

A Monte Carlo simulation was utilized to study the propagation of different polarized light through turbid media. Spatial distribution and polarization of photons transmitted through a spatial filter aperture were simulated. The results show that polarization gating and Fourier gating can effectively reject the multi-scattered photons and improve the contrasts of the images. Differences between linearly and circularly polarized lights for scatterers of different size are compared. For large scattering particles, effects of both gating techniques are limited. The results also show that in polydisperse solution, the gating methods also have effects to improve the image.