光学精密工程2012，Vol.20Issue(10)：2184-2191,8.DOI:10.3788/OPE.20122010.2184
线阵光学降水现象自动测量系统
Optical precipitation auto-measurement system based on linear image sensor
摘要
Abstract
An optical precipitation auto-measurement system based on a linear image sensor was designed to reveal the physical mechanism and essence of the precipitation. First, according to physical characteristics of precipitation particles and the demand for precipitation observation, an optical unit and a data acquisition and processing platform for the high speed linear image sensor were designed. As the mass acquisition data were inconvenient for transmission and processing under a continuous operation, the real-time binarization and encoding processing of the linear image were carried out by Field Programmable Gate Array (FPGA). To eliminate the influence of performance excursion of parallel light source and pixel photoelectric response nonuniformity on the setting thresholds and to ensure the measurement precision and coherence,an adaptive threshold setting scheme was proposed and realized based on a MicroBlaze soft-core processor in the FPGA. The comparison experiment with tipping bucket pluviometer based on calibration in a laboratory was carried out. Experimental result indicates that the resolution of precipitation auto-measurement system can achieve 0. 1 mm, and the error of cumulative precipitation amount in synchronization observation is about 15%. Obtained results can satisfy the requirements of precipitation auto-measurement for stabilization and high precision.关键词
降水现象/光电测量/雨滴图像/线阵图像传感器/自适应阈值Key words
precipitation/ photoelectronic measurement/ raindrop image/ linear image sensor/ adaptive threshold分类
天文与地球科学引用本文复制引用
高太长,江志东,刘西川,苏小勇,翟东力..线阵光学降水现象自动测量系统[J].光学精密工程,2012,20(10):2184-2191,8.基金项目
国家公益性行业科研专项资助项目(No.GYHY200806030) （No.GYHY200806030）
