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《Transactions of the Chinese Society for Agricultural Machinery》 2015-09
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Measurement of Raindrop Physical Properties with Particle Imaging Measurement Technology

Guo Minghang;Zhan Xiaoyun;Zhao Jun;Lin Qi;Institute of Soil and Water Conservation,Northwest A&F University;State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau,Institute of Soil and Water Conservation,Chinese Academy of Sciences,Ministry of Water Resources;Xi'an Dunrui Surveying Technology Co.,Ltd.;  
The shape,diameter and fall velocity are the key physical characteristics of raindrops. Thus it is imperative that we begin to focus on the direction of physical characteristics of raindrops. In order to obtain physical properties of raindrops,light field and imaging system were designed based on the particle imaging transient visual measurement technology. The software for image identification,extraction and measurement were investigated,and a natural precipitation imaging measurement system based on a charge coupled device sensor was established. The result of the experiment on steel ball showed that the measurement technology had small relative error. By the field experiment,we found that medium-sized particles were the predominant contributor in the single rainfall,with the diameter of 2. 00 mm and average fall velocity of 3. 52 m / s. Mathematic model was developed to calibrate fall velocity and diameter by using linear regression,and the prediction accuracy and precision were reliable. In conclusion,characteristics of raindrops can be measured precisely by the proposed technology,which is a novel method for observing rainfall properties and further researching soil erosion.
【Fund】: 国家自然科学基金资助项目(41371278);; 中国科学院科研装备研制资助项目(YZ201163)
【CateGory Index】: P412;P426.61
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