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Feasibility of an airborne TV camera as a size spectrometer for cloud droplets in daylight

机译：机载电视摄像机用作日光下云滴尺寸光谱仪的可行性

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摘要

Photographs of clouds taken with a camera with a large aperture ratio must have a short depth of focus to resolve small droplets. Hence the sampling volume is small, which limits the number of droplets and gives rise to a large statistical error on the number counted. However, useful signals can be obtained with a small aperture ratio, which allows for a sample volume large enough for counting cloud droplets at aircraft speeds with useful spatial resolution. The signal is sufficient to discriminate against noise from a sunlit cloud as background, provided the bandwidth of the light source and camera are restricted, and against readout noise. Hence, in principle, an instrument to sample the size distribution of cloud droplets from aircraft in daylight can be constructed from a simple TV camera and an array of laser diodes, without any components or screens external to the aircraft window.
机译：用大口径比的相机拍摄的云朵照片必须具有较短的聚焦深度才能分辨小液滴。因此，采样量很小，这限制了液滴的数量，并且在计数数量上产生了很大的统计误差。然而，可以以较小的孔径比获得有用的信号，这允许足够大的样本量以有用的空间分辨率在飞机速度下计算云滴。如果限制了光源和摄像机的带宽，则该信号足以区分来自作为背景的阳光云的噪声和读出噪声。因此，原则上，可以用简单的电视摄像机和激光二极管阵列来构建用于在白天对飞机上的云滴尺寸分布进行采样的仪器，而飞机窗外没有任何组件或屏幕。

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