NSF/NCAR GV (HIAPER) 3V-CPI Raw 2D-S Imagery. Version 1.0

The Three-View Cloud Particle Imager (3V-CPI) is a combination of three imaging instruments. Two of them comprise a 2D-S instrument, in which two 2D probes image particles as they pass through beams that are oriented orthogonally to each other and the airflow. If particles also lie in the intersection of the sensitive areas of the two beams, they are seen by both 2D probes. In that case, the CPI is triggered to take a high-resolution picture, via a briefly illuminated high-resolution imaging array, to provide a third image at high resolution. The probe is particularly suited to imaging ice crystals, but also provide good detection of other hydrometeors including large cloud droplets, drizzle and small rain drops, and precipitation particles. The 3V-CPI measures the size, shape and concentration of water drops and ice particles in clouds in the size range of 15-250 µm. This dataset contains 2D-S imagery collected by the 3V-CPI aboard the NCAR GV during the DC3 project. The 2DS puts all flight data into 3 files, and the size of these files depends on the amount of time in clouds.

三维云粒子成像仪（Three-View Cloud Particle Imager，3V-CPI）由三台成像仪器组合而成。其中两台构成2D-S仪器：当粒子穿过相互正交且与气流垂直的探测光束时，两台二维探头将对粒子进行成像。若粒子同时处于两束光束的敏感区域交汇处，则两台二维探头均可捕捉到该粒子，此时3V-CPI将触发短时照明的高分辨率成像阵列，拍摄高分辨率图像，作为第三幅成像结果。该系统尤其适用于冰晶成像，同时可有效探测包括大云滴、毛毛雨、小雨滴及降水粒子在内的各类水成物。三维云粒子成像仪可测量尺寸范围为15~250微米的云内水滴与冰粒子的大小、形态及数浓度。本数据集包含DC3项目期间，搭载于美国国家大气研究中心（NCAR）GV科研机的3V-CPI采集到的2D-S成像数据。2D-S仪器将所有飞行数据存储为3个文件，文件大小取决于在云中的累计飞行时长。