Optical Properties of Infrared Windows
Optical Properties of Infrared Windows
复制标题
红外窗口的光学特性
DOI：
--
复制
发表时间：
1999
期刊：
影响因子：
--
通讯作者：
D. C. Harris
中科院分区：
文献类型：
--
作者：
D. C. Harris
除了对透明度的明显需求外，在炎热环境中对窗户的一个关键要求是它不会发出会模糊所观看场景的光线。在本章中，我们将探讨透射、发射以及反射、折射和散射的相关性质。
考虑当光通过图1.1中厚度为B的光学窗口时会发生什么。目前假设该材料可以透射、吸收或反射光，但不能将光散射远离入射方向。辐射功率P0（Wm 2）撞击第一表面，在第一表面处辐射功率R1被反射，并且辐射功率P1进入样品。P1的一部分被吸收，因此功率P2（<P1）到达第二表面。一些功率通过第二表面传输，并且R2被反射。这种部分反射和部分透射的过程会无限地持续下去，因为光线在窗口内来回反弹，最终强度接近于零。净透射功率P是第二表面处所有部分透射光的总和。
In addition to the obvious need for transparency, a critical requirement for a window in a hot environment is that it does not emit light that would obscure the scene being viewed. In this chapter we will explore transmission, emission and the related properties of reflection, refraction and scatter.
Consider what happens when light passes through an optical window with thickness b in Fig. 1.1. Suppose for the moment that the material can transmit, absorb or reflect the light, but it cannot scatter light away from the incident direction. Radiant power P0 (Wâm2) strikes the first surface, where radiant power R1 is reflected and radiant power P1 enters the sample. Some of P1 is absorbed, so power P2 (<P1) arrives at the second surface. Some power is transmitted through the second surface, and R2 is reflected. This process of partial reflection and partial transmission continues ad infinitum as the light ray bounces back and forth inside the window and eventually dies to near zero intensity. The net transmitted power, P, is the sum of all the partially transmitted light at the second surface.