激光雨滴谱仪尺度测量精度的设计与应用

Design and Application of Size Measurement Accuracy of Laser-Optical Disdrometer

强降水时降雨量测量偏差较大是激光雨滴谱仪在应用中的普遍问题需要被改善。以探测源头激光器为着眼点,深入研究其特性,针对雨滴谱仪应用原理,采取了光栅设计、优化处理算法和尺度标定措施,以加强降雨粒子尺度测量精度,实现了在强降水过程中较小的测量偏差。经过国内多地强降雨的实际观测检验,结果表明:该雨滴谱仪尺度测量精度的设计,实现了强降水过程中降雨量测量精度平均绝对偏差6%左右,最大偏差不超过10%的目标;设备经受住了台风过程中的强降雨考验,取得了较好的观测和应用效果。

The large deviation in the accumulated rainfall measurements during heavy rainfall is a common problem in the application of laser-optical disdrometers,which needs to be improved.We start from the source laser and analyze its characteristics in depth and adopt a number of measures such as laser grating design,optimization algorithm,and scale calibration,so as to improve the precision of precipitation particle size measurement and the accumulated rainfall measurement accuracy.After the observation in different places in China,the results show that the design of the scale measurement accuracy of the laseroptical disdrometer has reached the goal of average absolute deviation of rainfall measurement accuracy of about 6% and the maximum deviation of less than 10% during heavy rains.Besides,the equipment has passed the test of heavy rainfall of typhoon and obtains better observation and application effects.