Patent ID: 8307723
Filing Date: 2012-11-13
Classification: G01N

Abstract:
1. A device for sampling residues from an external surface of an object, structure, vehicle or person, which comprises: a) a sampling head with forward face and perimeter; b) a suction intake port disposed centrally on said forward face and an array of jet nozzles peripherally disposed on said forward face around said suction intake port, wherein said jet nozzles are directed at a virtual apex of a virtual cone with base resting on said forward face; c) a positive pressure source for firing a gas sampling jet with streamlines from each nozzle of said array of jet nozzles; d) a suction pressure source for drawing a sampling return stream of gas into said suction intake port, said suction pressure source having an inlet and an outlet; wherein said streamlines of said gas sampling jets are directed toward said virtual apex of said virtual cone, said streamlines tracing an involuted frustroconical “U” under the attraction of said suction pressure source and converging with said sampling return stream at said suction intake port along a central axis of said virtual cone when impinging on said external surface.