光束发散角
Far-field divergence angle
beam divergence angle
beam divergence
有效发光效能
effective radiation efficiency
有效束散角
effective beam divergent angle
X射线激发发光光谱
x-ray excited luminescence spectrum
x-射线激发发光光谱
x-ray excited luminescence spectrum
发散光束摄影术
divergent-beam photography
激光束散角
laser beam divergence angle
laser divergence angle
远场发散角角半径
Angular radius of far field divergence
Far field divergence angular radii