天幕靶人工光源的设计

摘要

针对天幕靶在使用时必须有非常稳定的光源，为了实现天幕靶能够全天候测量以及在室内测量，设计采用LED作为天幕靶的人工光源；分析了LED的特性，提出用超高亮度平头发光二极管作为人工光源，通过器材设计半径为5m的扇形形状LED光源。采用恒压供电，经过试验，该光源满足天幕靶在阴天或室内光线比较暗时测速的要求，而且对天幕靶的灵敏度有大幅度的提高。%For the sky screen must have a very stable light source when being used, in order to achieve the target for all-weather sky measurements and indoor measurements, the article uses LED as artificial light source for sky screen. The characteristics of LED is