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Comparison of modeled atmosphere-dependent range performance of long-wave and mid-wave IR imagers

机译:长波和中波红外成像仪的模型化与大气有关的测距性能比较

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摘要

In this paper, the ranges of two specific long-wave infrared (LWIR) and mid-wave infrared (MWIR) focal plane array (FPA) systems are estimated and compared, using MCDTRAN to Calculate atmospheric transmission and NVTherm to calculate the ranges. The calculations are for a standard tank target, clear weather conditions and a horizontal terrestrial path at mean sea level, under varying ambient temperature and relative humidity (RH) conditions. Detection ranges are more sensitive to temperature and RH variations than the recognition ranges, while identification ranges are the least sensitive. LWIR ranges depend more upon these variations than do MWIR ranges. The relative range ratios are plotted versus the ambient temperature and RH as a contour plot. Typically, LWIR systems perform better at lower ambient temperatures and RHs, while MWIR systems are advantageous at higher temperatures and RHs. The so-called 'phase curve' separating the MWIR and LWIR 'phases' also depends upon system parameters (FPA and optics). Ambient temperatures and RHs vary diurnally and seasonally, and over kilometer distance scales. Our Proposed plot is more flexible than the standard scenarios used in MODTRAN. The advent of dual band imaging systems has not rendered this discussion irrelevant since the more producible FPAs are sequential rather than simultaneous. (C) 2008 Published by Elsevier B.V.
机译:本文使用MCDTRAN来计算大气透过率,并使用NVTherm来计算和比较两个特定的长波红外(LWIR)和中波红外(MWIR)焦平面阵列(FPA)系统的范围。这些计算是针对标准的坦克目标,晴朗的天气条件和在变化的环境温度和相对湿度(RH)条件下平均海平面的水平地面路径。与识别范围相比,检测范围对温度和RH变化更敏感,而识别范围最不敏感。 LWIR范围比MWIR范围更依赖于这些变化。绘制相对范围比率相对于环境温度和RH的等高线图。通常,LWIR系统在较低的环境温度和RHs下表现更好,而MWIR系统在较高的温度和RHs下更有利。分离MWIR和LWIR“相位”的所谓“相位曲线”还取决于系统参数(FPA和光学器件)。环境温度和相对湿度每天和每个季节都有变化,并且超过一公里。我们的建议图比MODTRAN中使用的标准方案更灵活。由于可生产的FPA是连续的而不是同时的,因此双频带成像系统的出现并没有使讨论变得无关紧要。 (C)2008由Elsevier B.V.发布

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