| 红外窗口气动热辐射效应评估方法 |
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| 引用本文： | 王亚辉,王强,张伯川,郑文娟,刘彦,徐力.红外窗口气动热辐射效应评估方法[J].红外与激光工程,2016,45(2):204001-0204001(6). |
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| 作者姓名： | 王亚辉 王强 张伯川 郑文娟 刘彦 徐力 |
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| 作者单位： | 1.北京航空航天大学 能源与动力工程学院,北京 100191; |
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| 基金项目： | "十二五"预研项目(51301030101) |
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| 摘 要： | 气动热辐射效应导致红外探测制导系统的性能降低甚至失效,而红外窗口是气动热辐射效应评估的关键因素。通过分析红外辐射在红外窗口中的传输特性,提出一种红外窗口气动热辐射效应评估方法,基于等温状态试验,评估了某超音速飞行器红外探测系统蓝宝石红外窗口在中波3.7~4.8m波段的气动热辐射效应。研究结果显示,红外窗口暴露于大气环境后,蓝宝石窗口导致的气动热辐射效应迅速上升,表现为红外窗口透过率下降约10%,仍然在0.9以上,而自辐射迅速增强约458倍,相当于约125℃黑体,在探测器获取总辐射中的比例大于78%。在对地探测应用中,对于厚度小于20 mm的蓝宝石红外窗口,窗口温度在100~350℃范围内,随着厚度增加,透过率下降,自辐射增强,总辐射也增强,自辐射在总辐射中的比例增加,易造成探测器饱和,对探测系统影响较大。
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| 关 键 词： | 气动热辐射效应 红外窗口 自辐射 透过率 |
| 收稿时间： | 2015-06-12 |
Evaluation method for aero-thermo-radiation effect of IR window |
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| Affiliation: | 1.School of Energy and Power Engineering,Beihang University,Beijing 100191,China;2.Beijing Aerospace Automatic Control Institute,Beijing 100854,China;3.National Key Laboratory of Science and Technology on Aerospace Intelligent Control,Beijing 100854,China |
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| Abstract: | The windows of IR detection systems becomes the main factor of the aero-thermo-radiation effect, which reduces the performance of these IR systems, or even makes these systems fail. By analyzing thermal radiation propagating in IR windows, a participating medium, an evaluation method for aero-thermo-radiation effect of the non-isothermal IR windows was proposed, based on the experimental results of the isothermal state, include self-radiation and transmittance. Aim to an MWIR detection system of a hypersonic vehicle, aero-thermo-radiation effect of a sapphire IR window was evaluated in 3.7-4.8m. The results indicate that, as the sapphire IR window is exposed in high-temperature and high-speed airflow, the aero-thermo-radiation effect of the window intensifies as temperature rises rapidly, the transmittance drops about 10%, still bigger than 0.9, otherwise the self-radiation enhances 458 times approximately, equal to that of blackbody about 125℃. For sapphire windows in 100-350℃, which thickness are smaller than 20 mm, as thickness increases, the transmittance decreases, self-radiation increases, and total radiation behind sapphire windows is increased, of which the ratio of self-radiation increases. So, self-radiation would drive detector into saturation easily, of which the influence on the MWIR detection system is bigger than that of transmittance. |
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