为了实现在机载条件下对降水粒子进行成像测量,设计了一种基于光电二极管阵列的成像测量系统。 该测量系统由光学系统、硬件系统和软件系统三部分组成,其中光学系统可实现激光光束整形和对粒子进行 成像;硬件系统则由前端信号调理电路和FPGA控制电路两部分组成,主要实现粒子图像信号的采集与处理;软 件系统则包含下位机软件系统和上位机软件系统两部分,可实现对粒子图像的压缩、显示和存储。室内标定实 验结果表明,系统探测的分辨率为60 μm,可探测粒径范围是60～7400{\\mkern 1mu}μm;外场飞行试验表明,所设计的系统可 满足在机载飞行条件下对降水粒子进行成像测量的要求。

To realize the precipitation particle imaging and measurement in the airborne condition, an imaging and measurement system was developed based on photodiode array. The system is composed of an optical system, a hardware system and a software system. The optical system can shape the laser beam and image the particles. The hardware system is composed of a front-end signal conditioning circuit and an FPGA controlling circuit, and mainly function in the particle image acquisition and signal processing. The software system contains two parts in FPGA and PC respectively, and realize the particle image compression, display and storage. Calibration in laboratory shows that the system’s measurement range is in 60～7400 μm, with a resolution in 60 μm. Field campaign results indicate that the system can meet the requirement of precipitation particle imaging and measurement under the flying condition.