针对单颗粒光散射测量方法中被测颗粒折射率会影响测量结果的问题, 根据Mie理论和光辐射能通量计算公式, 对13种常见气溶胶颗粒, 在不同采光中心角θ和采光接收半角β下的散射光辐射能通量F与粒径D关系曲线进行了计算, 提出一种基于相对测量误差平均值的评价标准, 依据该评价标准定量分析了13种折射率对测量的影响。通过对模拟结果的分析, 得出采光结构接收到的光辐射能通量包含前向散射光的条件下, 13种颗粒的F-D曲线较为接近, 折射率对测量结果的影响相对较小。

A method of clarifying bioaerosol particles is proposed based on T-matrix. Size and shape characterizations are simultaneously acquired for individual bioaerosol particles by analyzing the spatial distribution of scattered light. The particle size can be determined according to the scattering intensity, while shape information can be obtained through asymmetry factor (AF). The azimuthal distribution of the scattered light for spherical particles is symmetrical, whereas it is asymmetrical for non-spherical ones, and the asymmetry becomes intense with increasing asphericity. The calculated results denote that the 5o–10o scattering angle is an effective range to classify the bioaerosol particles that we are concerned of. The method is very useful in real-time environmental monitoring of particle sizes and shapes.

为了能够实现对大气中有机气溶胶颗粒的探测，采用激光诱导荧光技术，提出了适用于探测大气有机气溶胶颗粒的荧光激光雷达系统模型。对系统模型及探测原理进行了详细描述，给出了荧光雷达系统参数，并对系统的探测能力进行了模拟。结果表明，该系统在夜间测量时，在5km以下，对有机颗粒的最小可探测浓度可达到几个颗粒／L；对于白天测量，由于太阳背景辐射的影响，在2km以内有较高的灵敏度，最小可探测浓度可达到10个颗粒／L，基本上能够满足实际应用中对有机气溶胶颗粒探测的要求。这对荧光雷达系统的搭建提供了有利的指导。