%0 Journal Article %T Ultra-fine powder extinguishing agent concentration measurement based on extinction method %A Ma, Weitong %A Fu, Yangyang %A Zhao, Junchao %A Lu, Song %A Zhang, Heping %J Optical Engineering %V 60 %N 9 %P 094110-094110 %@ 0091-3286 %D 2021-09-01 %I SPIE %~ DeepDyve