非球形降水粒子测量模型的初步研究  

A Preliminary Study on the Measurement Model of Non-spherical Precipitation Particles

作　　者：冯婉悦 佘勇[1] 姚振东[1] 

机构地区：[1]成都信息工程大学电子工程学院,四川成都610225

出　　处：《成都信息工程大学学报》2016年第2期136-141,共6页Journal of Chengdu University of Information Technology

基　　金：国家自然科学基金资助项目(41475143)

摘　　要：针对非球形降水粒子测量和雨滴体积重建的问题,首先讨论雨滴形状模型,认为BC模型(the model of Beard and Chuang)能准确地反应雨滴形状,并将雨滴按照等效尺度大小建模。然后结合降水粒子的图像扫描探测技术,分析线阵CCD对非球形降水粒子的扫描过程和粒子尺度、下落末速度的测量计算模型,并提出一种新的雨滴体积计算方法;为验证体积计算模型的有效性,选择CCD扫描频率30 k Hz、像元数1024×1024,采样区域面积100 mm×100 mm对3 mm雨滴进行扫描仿真,体积仿真结果与BC模型积分体积对比,其误差约为0.2%左右。结果表明,当粒子产生倾斜角时,需要对正、侧面投影分情况进行讨论。在此基础上,对测量模型中可能存在的误差进行探讨,并讨论了相关减小误差的方法,以期对下一步进行雨滴体积计算模型实验室实测数据的验证及其他相关研究做指导。Aiming at the problem of the non-spherical precipitation particle measurement and the raindrops volume recon- struction, this paper first discussed the raindrops shape model, and proved that BC model c reflect the actual shape of the rain, and the raindrop＇.s were modeled according to their equivalent size. Then, combined with the image scanning technology for detecting precipitation, the scanning process of linear array CCD for non-spherical precipitation particle and particle size and fall te：rminal velocity calculation model were analyzed, and a new method of raindrops volume calcu- lation was presented ; To verify the feasibility of the new method, select CCD scanning frequency 30 kHz, Pixel number 1024x 1024, sampling area 100 mmx 100 mm 3 mm raindrops scan and simulate, and the volume simulation results were compared with the integral volume of BC model, and the error was about 0.2 %. The results show that when the angle is produced, it is necessary to discuss the situation of the positive and the side projection. On this basis, the possible er- rors in the measurement model and the related methods to reduce the errors were discussed in order to guide the verifica- tion of volume calculation ＂with experimental data and others related research.

关 键 词：信号与信息处理 大气探测 非球形降水粒子 图像扫描探测技术 线阵CCD 雨滴体积测量 

分 类 号：TN911.7[电子电信—通信与信息系统]