Mr. Han-peng Liu Profile

Han-peng Liu

at Beihang Univ

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Proceedings Article | 24 August 2009 Paper

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

Hua Li, Han-peng Liu

Proceedings Volume 7381, 73811E (2009) https://doi.org/10.1117/12.835591

KEYWORDS: Sensors, Absorption, Data communications, Control systems, Telecommunications, Light sources, Signal processing, Data processing, Databases, Lamps

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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.

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