OPTICAL DUST COUNTER Russian patent published in 1997 - IPC

FIELD: optical engineering. SUBSTANCE: first radiator in optical dust counter is positioned in front of working chamber. It forms measuring channel and is coupled optically to photoreceiver through protection windows of working chamber. Second radiator is placed behind working chamber. It forms check channel and is also coupled to photoreceiver optically. Third radiator is arranged inside device behind working chamber. It forms auxiliary check channel and is coupled to photoreceiver optically through protection window. All radiators are manufactured for alternate switching-on. EFFECT: higher measurement results. 1 dwg