光学雨滴谱测量仪能够实时监测雨滴直径分布、雨滴降落速度等气象参数, 可应用于气象研究、环境监测、农业安全预警等领域。采用红外LED光源和线阵CCD, 搭建了雨滴谱测量光路, 并用水滴代替雨滴, 演示测量了通过采样空间的水滴的直径和速度, 验证了雨滴参数光学测量的可行性。实验中发现当较大雨滴紧贴CCD窗口通过采样空间时, 液体透镜效应十分明显, CCD对应区域的光强增强, 与通常的遮挡现象正好相反, 因此在后续的程序处理中需妥善处理这类异常信号。

Raindrop spectrograph could widely applied in meteorology research, environmental monitoring and agriculture safety forecast for its function of rain parameters measurement, such as raindrop diameter and raindrop velocity. To verify the feasibility of optical raindrop measurement, an infrared LED and linear CCD is used to setup an optical measurement scheme for raindrop parameters. Substituting for raindrop, water drop is used to demonstrate the optical measurement for raindrop diameter and raindrop velocity. Differently, when the water drops extremely close to the CCD photosensitive surface, the detected signal is contrary to the normal result, which is caused by convergent effect of liquid lens. So the abnormal signal should be treated specially avoiding the measurement errors.