Using Absorption Spectroscopy to Monitor Air Pollution

The scientific research project “Research on the Use of Differential Absorption Spectroscopy to Monitor Air Pollution in Real Time” completed by the Hebei University of Engineering has passed acceptance.

The differential absorption spectroscopy technology used in this project is not only suitable for the inversion calculation of NO2 concentration of atmospheric pollutants due to expensive high-resolution spectrometers, but more importantly it is also applicable to ordinary spectrometers with low prices, and the use of ordinary spectrometers using this technology Good inversion results can also be obtained. Because the acquisition of the reference spectrum of this project is on the ground of the area to be measured, it is more economical and convenient to collect the reference spectrum than on the plane or on the mountaintop. Therefore, using this technology to measure the concentration of NO2 in air pollutants consumes less funds, is easy to operate and can guarantee a certain measurement accuracy, and has a strong universality.

At the same time, the differential absorption spectroscopy technology studied in this project is not only suitable for monitoring the concentration of pollutants NO2 in the atmosphere, but also for the monitoring of other nitrogen oxides, SO2, O3 and other pollutants in the atmosphere. It is only necessary to move the monitoring wavelength to the vicinity of the characteristic absorption peak of the contaminant, and at the same time, the absorption cross-section data can be replaced with the absorption cross-section data of the corresponding contaminant. In addition, if the spectrometer used has a broad range of acquisition wavelengths, simultaneous monitoring of multiple contaminants can be achieved. The implementation of this project will produce better social, economic and environmental benefits for Handan City and help the city achieve the goal of sustainable development.