On-line pollution monitoring system based on differential optical absorption spectroscopy

BAI Yang， DONG Bao-li
（Faculty of Mechanical Engineering & Automation， Zhejiang Sci-Tech University， Hangzhou 310018， China）

Abstract： Aiming at the present situation that can not detect the fixed source of pollution continuously and accurately，an online continuous monitoring system based on differential optical absorption spectroscopy （DOAS） was designed. Continuously and accurately，the ARM and DSP core，the Linux operating system，and MiniGUI interface environment were used for system development. The system was consisted of spectral data acquisition module and control module. The process of spectral data acquisition was controlled by spectral acquisition and the control module was used for calculating and displaying the gas concentration. The results indicate that the online continuous monitoring system can collecte gases such as SO2 and NO and has high stability and accuracy. However，the test error is too high when testing in high temperature and high concentration，and this needs further improvement.
Key words： differential optical absorption spectroscopy （DOAS ）； charge coupled device （CCD）； ARM； digital signal processing （DSP）； S3C2440； xenon lamp