一维云粒子激光探测仪研制及探测数据分析

Development and measurements analysis of one-dimensional cloud droplet laser probe

阐述基于Mie散射理论和激光技术而研制的云粒子探测仪的相关问题。利用μm量级的小孔光阑模拟感应区域的散射光,并对系统的探测敏感区域面积进行测定;通过使用不同直径的标准粒子对系统进行标定,得到可靠的响应曲线,用于定量测量云粒子尺度谱及粒子数密度。在进行了一系列实验室内的实验之后,将仪器装载在飞机上进行穿云飞行测量实验,表明了该仪器在飞行过程中工作正常、稳定,并且能够即时地显示采样区内云粒子尺度谱分布和数浓度;通过分析探测得到的数据,并与云粒子谱分布进行比较,确认了探测数据有效可靠,反映了该仪器具有良好的测云能力。

This study describes the development and relevant issues of a new cloud droplet probe based on Mie scattering and laser technology. A small pin-hole orifice is used to simulate the light scattered to determine the sensing area for the system. Cali bration is precisely done by adopting standard spherical samples with different diameters as the replacements of different size cloud droplets to obtain the system response curve, so the droplet size and concentration of cloud particles can be determined. After a series of experiments were finished in laboratory, the probe was put on the airborne to do the cloud experiment, and the airborne experiments demonstrate that the new cloud droplet probe works reliably and stably, and it can show the droplet size and concen tration of cloud particles in sensitive areas immediately. After analysing the stored data, calculating the number of the particles, and comparing with the droplet size in cloud, we found that the data is effective and reliable, the system has good capacity to probe the cloud.