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Backscatter signatures of biological aerosols in the infrared

机译：红外生物气溶胶的反向散射特征

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To develop a deeper understanding of the optical signatures of both biological aerosols and potential interferents, we made field measurements of optical cross sections and compared them to model-based predictions. We measured aerosol cross sections by conducting a hard-target calibration of a light detection and ranging system (LIDAR) based on the Frequency Agile Laser (FAL). The elastic backscatter cross sections are estimated at 19 long-wave infrared (LWIR) wavelengths spanning the range from 9.23 to 10.696 (mu)m. The theoretical modeling of the elastic backscatter cross sections is based on the measured refractive index and size distribution of the aerosols, which are used as inputs into Mie calculations. Both model calculations and experimental measurements show good agreement and also indicate the presence of spectral features based on single particle absorption in the backscatter cross sections that can be used as a basis for discrimination for both standoff and point sensors.
机译：为了深入了解生物气溶胶和潜在干扰物的光学特征，我们对光学横截面进行了现场测量，并将其与基于模型的预测进行了比较。我们通过对基于频率捷变激光（FAL）的光检测和测距系统（LIDAR）进行硬目标校准来测量气溶胶横截面。弹性背向散射截面是在19个长波红外（LWIR）波长下估计的，范围从9.23到10.696μm。弹性背向散射截面的理论模型基于所测得的气溶胶的折射率和尺寸分布，并用作Mie计算的输入。模型计算和实验测量均显示出良好的一致性，并且还表明了基于后向散射横截面中单个粒子吸收的光谱特征的存在，这些特征可以用作辨别对位传感器和点传感器的基础。

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