一次大气颗粒物投影轮廓分维研究

构建了一次大气颗粒物投影轮廓分维模型,并以高精度数字光学显微系统为基础,测算了广州市3种一次大气颗粒物颗粒样品的投影轮廓分维,结果验证了颗粒投影轮廓分维数学模型的合理性,形成了一套简约的一次大气颗粒物投影轮廓分维分析方法。结果还表明一次大气颗粒物投影轮廓分维个数频率分布曲线呈＂S＂型,且一次大气颗粒物对数投影轮廓分维分布曲线呈对数正态分布;3种一次大气颗粒物样品中,柴油汽车排气管中沉积颗粒和餐饮过程产生的颗粒不规则程度相对低,其偏离圆的程度小,粗糙度较小;而粉煤灰颗粒的相反。

A Study on the Projected Outline Fractal Dimension of Primary Atmospheric Particle

A mathematical model was modeled to calculate the projected outline fractal dimension of primary atmospheric particles.The projected outline fractal dimension of primary atmospheric particles were measured and calculated based on a high precision digital optics micro-system.The results of the experiment proved it rational.So,a simple analytical method was generated to calculate the projected outline fractal dimension of primary atmospheric particles.The results also indicated that the amount cumulative frequency curve of the projected outline fractal dimension appeared ＂S＂ pattern,and the particles＇ logarithmic projected outline fractal dimension amount cumulative frequency distribution obeyed logarithmic normal distribution.For the three tested primary atmospheric particle samples,diesel car exhaust pipe deposited particles and dining particles were more regular than the coal ash particles,and they were less divergent from the circle than the coal ash particles.