A gas analysis device for the remote detecting, measuring and recording of NO, CO, CO.sub.2, HC, and H.sub.2 O levels from the exhaust (30) of moving motor vehicles (28) utilizes a source (11) of collimated infrared and ultraviolet radiation (15) and includes a detector unit (16) positioned on the opposite...http://www.google.ca/patents/US5401967?utm_source=gb-gplus-sharePatent US5401967 - Apparatus for remote analysis of vehicle emissions
