PROBE Russian patent published in 2003 - IPC

FIELD: concentration of aerosol particles; spraying aerosol on articles; impactors for check of dust content in shops. SUBSTANCE: proposed probe consists of supersonic Laval nozzles which are tightly interconnected. Throat of each nozzle is no less than throat of first (in way of flow of gas) Laval nozzle . First convergent (subsonic) nozzle is coaxially inserted into subsequent nozzle forming ejectable cavity between them. Gas under pressure is positively pumped through cavity made in form of supersonic ejector, thus forming subsonic velocity of flow in first throat (in way of motion of gas) for evacuation of cavity; gas flow is accelerated by vacuum of this cavity to sound velocity and then to supersonic velocity. EFFECT: reduced power requirements; extended field of application. 1 dwg