摘要：选取燃煤锅炉、道路扬尘、汽车燃油不完全燃烧产生的颗粒、土壤颗粒等4种颗粒,利用数字显微和图像处理技术,求取降尘颗粒轮廓投影曲线的分形维数,并根据实际采样情况,求取降尘部分源颗粒的轮廓投影曲线分形维数,根据分形维数间的关系对比分析后判断降尘颗粒的来源。结果表明:将大气降尘轮廓投影曲线分形维数值作为降尘颗粒来源的辨析参数是可行的,将轮廓投影曲线的分形维数值和投影轮廓的其他几何特征参数相互结合可以得到很好的判断结果。

关键词：大气降尘；分形维数；轮廓投影；来源

Abstract：Four kinds of granule from the coal-fired boiler, road dust, the automobile fuel oil incompletely combustion, soil were chosen. The digital micrograph technique and image process technique was used and the fractal dimension of the particles figure projection was obtained. Then based on the reality instance, some original particles figure projection's fractal dimension were gained which were the component of the fall dust. The source of the fall dust with the relationship between the fractal dimensions was judged. The results indicated that it was feasible to show the atmospheric falling dust outline projection curve fractal dimension value by the discrimination parameter which originated as the falling dust pellet. Unifying mutually the outline projection curve's fractal dimension value and the projection outline's other geometry characteristic parameter might obtain a good judgment result. 

Keywords：atmosphere fall dust； fractal dimension； source； figure projection