The research and development of an air pollutant monitoring system based on DOAS technology

Hua Li; Han-peng Liu

doi:10.1117/12.835591

24 August 2009 The research and development of an air pollutant monitoring system based on DOAS technology

Hua Li, Han-peng Liu

Proceedings Volume 7381, International Symposium on Photoelectronic Detection and Imaging 2009: Material and Device Technology for Sensors; 73811E (2009) https://doi.org/10.1117/12.835591
Event: International Symposium on Photoelectronic Detection and Imaging 2009, 2009, Beijing, China

Abstract

This article illuminates a kind of sensor used in measuring the concentrations of the main pollutants in flue gas streams (Dust, SO₂ and NO_x) based on the UV-DOAS technology in air pollutant monitoring. Using the high-level embedded microprocessors and complex programmable logic device, the sensor completes system measurement, management and signal communication, and spectrum inversion and data saving are processed by PC at the same time. Differential optical absorption spectroscopy (DOAS) technology is used in the flue gas pollutant factor analysis through the sensor construction. The absorption spectra of SO₂, NO_x and smoke dust are inverted to reduce the interference of other factors in flue gas streams. At the same time, the effect of light source fluctuation and optical transmission ratio is considered and removed in the measurement system. The result shows that the monitoring accuracy of concentration of sulfur dioxide and smoke dust achieves ±2%, the concentration of nitrogen oxides accuracy achieves ±3%, which meets the requirements of the national standard. The sensor can be directly installed in a flue. As a result, process of measuring is simplified and measurement accuracy is improved. Further more, this method increases the stability of the system and reduces the maintenance costs. Measurement data is transferred through data bus between the sensor and upper PC to realize remote control and real-time measurement. Considering the severe conditions in measuring the main pollutants in flue gas streams, applications of anti-interference and anti-corrosion etc. are taken in the system design.

Citation Download Citation

Hua Li and Han-peng Liu "The research and development of an air pollutant monitoring system based on DOAS technology", Proc. SPIE 7381, International Symposium on Photoelectronic Detection and Imaging 2009: Material and Device Technology for Sensors, 73811E (24 August 2009); https://doi.org/10.1117/12.835591

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KEYWORDS

Absorption

Sensors

Data communications

Control systems

Telecommunications

Light sources

Data processing

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