半導体レーザによる降雪センサの開発

Abstract

By polarimetric radar, remote rainfall sensing technique is advancing but snowfall sensing is not advanced. For snowfall sensing, a disdrometer that has capability of hydrometer imaging in radar beam area is needed. A low-cost disdrometer with laser line scanner which has 48 mm (384 pixel) image width and slice rate at 12 kHz for snowfall is developed. For comparing, disdrometer for rainfall which has 16 mm (128 pixel) image width and slice rate at 22 kHz is developed and test observation that used both disdrometer was carried out at Zaozan (Yamagata pref.). The 48 mm width disdrometer could observe whole image of snowfall compared to 16 mm disdrometer and enough performance for snowfall imaging was signified.