光学介质双向透射分布函数研究-光学专业论文.docxVIP

I I 摘 要 双向透射分布函数（Bidirectional transimission Distribution Function,简 称 BTDF）是从辐射度学出发，在几何光学的基础上描述各种材料光谱透射特性的物理 参量。双向透射分布函数目前主要应用于计算机图形学领域，光学系统设计与加工领 域，它是评价光学元件，光学薄膜等光学性能的重要参数。随着研究的日益深入，双 向透射分布函数在日常生活和工业生产领域也逐渐得到重视。就目前而言，对于双向 透射分布函数的研究还是比较少的，并不像双向反射分布函数的研究工作那么充实， 所以本文从基础出发对双向透射分布函数的基础理论和测量装置进行了初步的研究。 本文首先讲述了双向透射分布函数（BTDF）的研究背景以及当前对 BTDF 测量的几 种常用方法。其次通过对双向透射分布函数，半球透射率和双向透射系数的研究建立 了 BTDF 与双向透射系数和半球透射率的关系，同时研究了 BTDF 的测量原理，确定用 单一测量法进行本文中实验的测量处理方法。接着推导了双向概念的研究 还对几种常 见的透光光学介质和 4 种常用的 BTDF 测量方法进行了介绍。然后建立了双向透射分布 函数的散射光谱自动测量系统，建立了实验平台，设计了绕定轴转动的光学介质的透 射光谱测量实验，成功测量了聚四氟乙烯和毛玻璃的透射光谱，得到了相应的 BTDF 数 据。 关键词： 双向透射分布函数（BTDF） 散射光谱自动测量系统 双向透射系数 II II ABSTRACT Bidirectional transmittance distribution function (Bidirectional transimission Distribution Function, BTDF for short) is proceeding from radiometry, in geometrical optics based on physical parameters describing spectral transmission properties of various materials, represents a different angle of material under the condition of transmission characteristics at any viewing angle. Bidirectional transmittance distribution function is mainly applied to the field of computer graphics, optical system design and manufacturing fields, it is the evaluation of optical components, optical thin-film optical properties, such as the important parameters. As research increasingly deepening, bidirectional transmittance distribution function in their daily lives and industrial production has gradually been taken seriously. Due to the current research on bidirectional transmittance distribution function is relatively small, this bidirectional transmittance distribution function of the basic theory and measuring devices have been studied. This paper describes the experimental methods bidirectional transmittance distribution function (BTDF) research background and the most commonly used measure BTDF. Secondly, through the study of two-way transmission distribution function, bi-hemispherical transmittance and transmission coefficients established relations