METHOD AND DEVICE FOR DETECTING THE STATE OF A FILTER SUBJECTED TO AN AIR FLOW

摘要

The invention relates to a device for detecting the state of a filter subjected to an air current (3), especially for purifying the ambient air supplied to the interior of a vehicle. Said device comprises an element (7) emitting radiation and a receiver (8) which reacts to the radiation. Said element (7) emitting radiation and said receiver (8) are arranged on the side (6) of the filter (5) against which the air flows. Part of the side (6) of the filter (5) against which the air flows forms a reflection surface (12) for the bundle of rays (10) emitted by the abovementioned element (7).