基于线偏振光反射率测量介质折射率的研究

The research measuring refractive index of medium based on reflectivity of linear polarized light

研究线偏振光的振幅反射率与介质折射率的关系,提出一种测量介质材料折射率的方法。文中从菲涅耳公式出发,推导出各向同性介质的线偏振光反射率与折射率的关系式,给出基于线偏振光反射率测定介质折射率的原理。设计实验方案,在不同入射角情况,定出线偏振光p方向和s方向两种线偏振光在玻璃表面的反射率,得到线偏振光振幅反射率随入射角变化的实验曲线。依此实验数据得出材料的折射率。结果表明,测出的介质材料的折射率与理论值相符,所采取的测定方案可行。

The relationship between the amplitude reflectivity of linear polarized light and the refractive index of medium material was studied.A method was presented for measuring refractive index of medium materials.The relationship between the isotropic medium reflectivity of linear polarized light and the refractive index was derived from Fresnel formula.The principle on measuring refractive index of medium basedon reflectivity of linear polarized light was given.The configuration of the experimental installation was introduced.The variation curve was measured for the amplitude reflectivity of linear polarized light of P component and S component with changing angles of incidence.The refractive index of the materials was obtained according to the variation curve.The results show that a good agreement between experimental data of medium materials and the theory predictions is reached.The scheme is proved feasible.