基于脉冲数字全息干涉术的云滴谱离散度研究  

Dispersion of Cloud Droplet Based on Pulsed Digital Holographic Interferometry

作　　者：高阳子 王骏 唐家斌 刘晶晶 闫庆[1] 华灯鑫[1] Gao Yangzi;Wang Jun;Tang Jiabin;Liu Jingjing;Yan Qing;Hua Dengxin(School of Mechanical and Precision Instrument Engineering,Xi'an University of Technology,Xi'an,Shaanxi 710048,China)

机构地区：[1]西安理工大学激光雷达遥感研究中心,陕西西安710048

出　　处：《光学学报》2022年第6期157-166,共10页Acta Optica Sinica

基　　金：国家自然科学基金(41875034,52127802)。

摘　　要：为了研究云滴谱的离散度与云微物理参量之间的相关性,提出了基于现场可编程门阵列的短脉冲调制激光、高分辨率显微光学系统和同轴数字全息干涉术相融合的观测技术,该技术探测云滴粒子的最小尺寸为2μm,还可以获得完整的云滴谱谱宽数据。在膨胀云室中连续三天的不同气溶胶数浓度下,开展了生消过程中云滴粒子的三维位置与直径的观测,利用观测结果计算了云微物理参量。进一步分析了云滴谱的离散度与云微物理参量在生成与消散过程中的正相关关系。通过比对不同气溶胶数浓度条件下云滴谱离散度的分布情况,得到了随着云滴数浓度的增多,离散度的取值范围会逐渐减小,且离散度相对拟合线的离散性降低的结论。In order to study the correlation between cloud droplet spectrum dispersion and cloud microphysical parameters,an observation technique based on short pulse modulated laser based on field programmable gate array,high resolution microscopic optical system,and coaxial digital holographic interferometry is proposed.The minimum size of cloud droplet detected by proposed technique is 2μm,and the complete spectrum width data of cloud droplet can be obtained.Under different aerosol concentrations for three consecutive days in an expanding cloud chamber,the three-dimensional positions and diameters of cloud droplets during the generation and elimination process are observed,and the cloud microphysical parameters are calculated by using the observation results.Furthermore,the positive correlation between the dispersion of cloud droplet spectrum and cloud microphysical parameters in the process of generation and dissipation is analyzed.By comparing the dispersion distribution of cloud droplet spectrum under different aerosol number concentrations,it is concluded that with the increase of cloud droplet concentration,the value range of the dispersion will gradually decrease,and the dispersion will decrease relative to the fitting line.

关 键 词：全息 数字全息 脉冲数字全息干涉术 云滴谱离散度 云微物理 

分 类 号：O438.1[机械工程—光学工程]