DEVICE FOR SAMPLING AND CONCENTRATING SMALL PARTICLES IN AIR BY IMPACTION

摘要

A device (1) for sampling and concentrating small particles, such as bacteria, bacterial spores and pollen in air by impaction. The device has a rotor (3) arranged on a rotor shaft and having one or more wings (4) with a leading edge and a trailing edge adapted to rotate in said air. Moreover, it has an inlet slit (5) at the leading edge of the wing (4) for letting in an airflow enriched with particles from the air that hits the leading edge of the wing during rotation of the rotor and a channel (6) for conducting said airflow from the slit (5) through the wing and the rotor shaft to possibly further enriching steps (7, 8) and a detecting step (9).