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首页> 外文期刊>Journal of atmospheric and oceanic technology >A New Videosonde with a Particle Charge Measurement Device for In Situ Observation of Precipitation Particles
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A New Videosonde with a Particle Charge Measurement Device for In Situ Observation of Precipitation Particles

机译：一种新型带颗粒电荷测量仪的探空仪，用于就地观测沉淀颗粒

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摘要

A new videosonde designed for microphysical soundings inside thunderclouds is described. This sensor makes use of a charge-coupled device (CCD) camera and can provide the phase (liquid or ice), the shape, the size, and the electric charge of each precipitating particle detected singly, the size of which ranges from 0.5 mm to 2 cm and the electric charge from +-1 to +-400 pC. The performances of the videosonde are analyzed and evaluated. It is found that the accuracy on the size measurement varies between about 13% for the smaller sizes and less than 2.6% for the larger sizes; meanwhile the average accuracy on the charge measurement is 3.2%. The determination of several large-scale parameters deduced from the videosonde data and comparable with radar observations and electrical soundings is presented. An intercomparison experiment with a disdrometer at the ground shows that the size distribution is perfectly restituted for large drops, even though the video permits filming at a maximum rate of only 50 images per second. The discrepancies that appear for smaller sizes are probably due to windy conditions to which small particles are much more sensitive, but it does not affect the rainfall-rate determination.
机译：描述了一种设计用于雷云内部微物理探测的新型视频探空仪。该传感器使用电荷耦合器件（CCD）相机，可提供单个检测到的每个沉淀颗粒的相（液体或冰），形状，大小和电荷，其大小范围为0.5 mm至2厘米，电荷从+ -1到+ -400 pC。对视频探空仪的性能进行了分析和评估。发现尺寸测量的精度在较小尺寸的情况下大约为13％，在较大尺寸的情况下小于2.6％。同时，电荷测量的平均准确度为3.2％。提出了从视空探空仪数据推导出的几个大型参数的确定方法，这些参数可与雷达观测和电测深进行比较。在地面上使用分散计进行的比对实验表明，即使视频允许以每秒仅50张图像的最大速率进行拍摄，大滴的大小分布也可以完美地恢复。较小尺寸出现的差异可能是由于大风条件下小颗粒更加敏感，但它不会影响降雨率的确定。

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