Motor Exhaust Telemetry Device Based on Differential Optical Absorption Spectroscopy

摘要

In order to monitor the motor vehicle exhaust effectively, a motor vehicle exhaust telemetry device is set up based ondifferential optical absorption spectroscopy (DOAS) in this paper. The absorption spectrum of NO and 1,3-butadieneare analyzed quickly, meanwhile, qualitative and quantitative analysis are made simultaneously by the Least SquareMethod. Moreover, the correlation coefficient of absorbance and concentration reaching more than 0.999, which isobtained by non-linear analysis through polynomial fitting method. Additionally, the minimum detection limits of NOand 1,3-butadiene are 3ppm and 0.5ppm respectively. In order to verify the performance of the system, a set of testswere performed for a long time. So the experimental results show that the relative error of NO is not more than 2%,and the relative error of 1,3-butadiene is less than 2%. In addition, the calculation results of the experimentdemonstrate that the repeatability error of NO is better than 1%, and the repeatability errors of 1,3-butadiene is lowerthan 2%. All the results meet the requirement of the application.