REMOTE VEHICLE EMISSION SENSING DEVICE WITH SINGLE DETECTOR

摘要

A remote sensing device for determining at least one characteristic of a vehicle emission plume (12) including a radiation source (10), a detector (14) and a plurality of filters (15). Either the filters (15) or the detector (14) are movable relative to the other such that different filters (15), each of which is capable of filtering out radiation except radiation of a predetermined wavelength band, can be used to filter the radiation directed to the detector (14). A method for remotely determining at least one characteristic of a vehicle emission plume (12) using a single detector (14) and a plurality of filters (15) wherein either the detector (14) or the filters (15) are positionable relative to one another.