Patent ID: 7544943

Claim:
A remote vehicle emissions measurement system comprising: a radiation source for emitting a light beam of a set of predetermined wavelength bands through an emission plume of a vehicle; an adaptable radiation detection unit comprising a plurality of detachable and expandable detecting elements, the plurality of detecting elements adapted to simultaneously receive the set of predetermined wavelength bands passing through the emission plume and produce a plurality of corresponding responses concurrently at any one time instant as required, the plurality of detachable and expandable detecting elements being grouped together in a compact manner; a processing unit interconnects with the radiation detection unit for analyzing and processing the data collected by the radiation detection unit, the processing unit comprising one or more specific software and hardware for calculating the concentrations of various gas components thereof, the relative ratio of one gas component to the others, or the absolute emission values of each of the gas components thereof; and means for checking whether there is any transient change between CO and NO x to determine if the vehicle is in transient mode for the elimination of unwanted erroneous data points.