Study on airborne laser cloud particle imaging probe and its calibration
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摘要: 为了实现对25m~1550m范围云粒子的测量和成像,采用了光学成像方法,基于准直光束照射的云粒子在64元探测器上投影切片组合的原理,研制了机载激光云粒子成像仪.介绍了激光云粒子成像仪各组成部分的功能,进行了探测单元量化标准、数据获取与处理方法、以及影响云粒子成像准确性的因素等方面的分析.建立了粒子尺寸校准装置,并采用7种规格的标准圆点进行了校准实验.结果表明,机载激光云粒子成像仪可探测到云粒子并成像,实现了粒子的尺寸测量和2维图像显示.Abstract: In order to measure and image cloud droplets ranging from 25m to 1550m, an airborne cloud particle imaging probe was designed based on the established optical imaging techniques. The images of particles passing through a collimated laser beam were projected onto a linear array of 64-element photo detectors and were reconstructed from the individual image slices. The function of each component and the quantitative standard of each detection unit were introduced. The method of data acquisition and the factors affecting the accuracy of cloud particle imaging were discussed. A calibration setup of particle size was constructed where seven kinds of standard dots were used to calibrate cloud imaging probe. The calibration experiment results show that cloud imaging probe can accurately achieve particle size distribution and display 2-D images. The airborne experiment data shows that cloud imaging probe is able to detect cloud droplets and acquire their images.
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