Method and system for remote exhaust emission measurement

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 for receiving the set of predetermined wavelength bands passing through the emission plume;
• a processing unit interconnects with the radiation detection unit for analyzing and processing the data collected by the radiation detection unit;
• characterized in that
• the adaptable radiation detection unit comprises one or more detachable and expandable detecting elements for receiving the set of predetermined wavelength bands and producing a plurality of corresponding response concurrently at any one time instant as required;
• and
• the processing unit comprises 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.