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 IDEAS-4 GV project. The 2DS puts all flight data into 3 files, and the size of these files depends on the amount of time in clouds.

三视云粒子成像仪（Three-View Cloud Particle Imager，3V-CPI）是三台成像仪器的组合体。其中两台构成2D-S仪器：当粒子穿过与气流及彼此均正交的光束时，两台二维探头会对其进行成像。若粒子同时处于两束光束的敏感区域交集内，则两台二维探头均可捕捉到该粒子。此时3V-CPI将触发工作，通过短时照明的高分辨率成像阵列拍摄一张高分辨率照片，以此提供第三幅高分辨率图像。该探头尤其适用于冰晶成像，同时也可出色地检测包括大云滴、毛毛雨、小雨滴在内的其他水成物以及降水粒子。3V-CPI可测量尺寸范围为15~250微米的云内水滴与冰粒子的大小、形状及浓度。本数据集包含了IDEAS-4 GV项目期间，搭载于NCAR GV飞机上的3V-CPI所采集的2D-S成像数据。该2D-S仪器将所有飞行数据整理为3个文件，文件大小取决于云中的飞行时长。