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A technique to measure optical properties of brownout clouds for modeling terahertz propagation

机译:一种测量掉电云的光学特性以模拟太赫兹传播的技术

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摘要

Brownout, the loss of visibility caused by dust resultant of helicopter downwash, is a factor in the large majority of military helicopter accidents. As terahertz radiation readily propagates through the associated dust aerosols and is attenuated by atmospheric water vapor within short distances, it can provide low-profile imaging that improves effective pilot visibility. In order to model this application of terahertz imaging, it is necessary to determine the optical properties of obscurants at these frequencies. We present here a method of empirical calculation and experimental measurement of the complex refractive index of the obscuring aerosols. Results derived from terahertz time-domain spectral measurements are incorporated into the AFIT CDE Laser Environmental Effects Definition and Reference (LEEDR) software.
机译:压降是直升机下水后尘埃引起的能见度下降,是绝大多数军用直升机事故的一个因素。由于太赫兹辐射很容易传播通过相关的粉尘气溶胶,并在短距离内被大气中的水蒸气衰减,因此它可以提供低轮廓的成像,从而改善飞行员的可见度。为了模拟太赫兹成像的这种应用,必须确定在这些频率下遮盖剂的光学性质。我们在这里介绍一种对遮盖的气溶胶的复折射率进行经验计算和实验测量的方法。从太赫兹时域光谱测量得出的结果被合并到AFIT CDE激光环境影响定义和参考(LEEDR)软件中。

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