CHEMILUMINESCENT GAS ANALYZER OF NITROGEN OXIDES IN EXHAUST GASES OF MOTOR VEHICLES

Abstract

The problem of instrumental control of vehicle exhaust gases is considered. One of the main components that make up the car's exhaust gases and lead to atmospheric pollutants are nitrogen oxides. According to the recommendations of international (UN ECE Regulations) and the state standard for measuring exhaust gases of cars for measuring nitrogen oxides (NO, NO₂, NOx), a chemiluminescent gas analysis method is used. The chemiluminescent method of measuring the concentration of nitrogen oxides in exhaust gases of motor vehicles consists in measuring the intensity of the chemiluminescent reaction with a photoelectron multiplier, where the value of the light flux is proportional to the concentration of nitrogen oxide. Since, due to the aging of the optical elements of the gas analyzer circuit, measurement errors increase due to a change in the conversion coefficient, the purpose of the work is to improve the chemiluminescent method of measuring nitrogen oxides (NO, NO₂, NOx) in car exhaust gases.