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近几年来,人们在化学汽相淀积硫化锌(CVD ZnS)方面的工作成果之一是,获得了一种作8～12微米的红外系统的窗口(或镜罩)应用很有前途的材料。本文将总结为确定CVD ZnS有关特性,特别是在下述两个特性方面,进行过的各种测试和计算: (a)光谱透过率/发射率。我们将证明:能满足根据高速飞行力学提出的结构要求的CVD ZnS窗口的透过和发射特性,在预料到的热荷载范围内,不会严重影响系统的灵敏度。 (b)对象质的不良影响。线扩展函数数据说明,小角度散射、折射率不均匀性,以及其它潜在的有损象质的特性,在高分辨率热成象的空间频率范围不会对系统的调制传递函数(MTF)产生任何明显的不良影响。
In recent years, one of the achievements in the chemical vapor deposition of zinc sulfide (CVD ZnS) has been the achievement of a promising material for the window (or mirror cover) applications of 8 to 12 micron infrared systems . This article summarizes the various tests and calculations performed to determine CVD ZnS-related properties, particularly with regard to the two following properties: (a) Spectral Transmittance / Emissivity. We will demonstrate that the transmission and emission characteristics of CVD ZnS windows that satisfy the structural requirements of high-speed flight mechanics will not seriously affect the sensitivity of the system over the expected thermal load range. (b) The negative impact on the quality of the object. Line Spread Function Data Description, Small Angle Scattering, Inhomogeneous Refractive Index, and other potentially detrimental qualities do not contribute to the system’s Modulation Transfer Function (MTF) in the spatial frequency range of high-resolution thermal imaging Any obvious adverse effects.