The objective was to develop an instrument which would remotely measure the CO, HC and NO emission from vehicles. The basic operation of the instrument developed is based on the selective infrared absorption by pollutant species in the rear wake of a vehicle as it is driven through an infrared beam which spans the roadway. The entire measurement sequence is performed automatically. The instrument measures CO and HC emission concentrations at low drive-through speeds, being limited by unexpected spreading of the infrared beam by non-isothermal wake turbulence which creates a false absorption signal. This false absorption signal becomes unacceptably large at velocities greater than 20 mph. Development problems encountered preclude the reliable measurement of NO emissions.


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