Abstract
Photoacoustic (PA) gas sensor for the detection of hazardous NO2 with detection limit as low as few part per billion by volume (ppbV) has been designed and tested with pulsed UV laser. Some design optimization factors such as the optimum cell geometry, buffer gas etc has been proposed. It was found that a cylindrical cell with many acoustic filters considerably dampens the noise level and also argon as a buffer gas improves the photoacoustic signal level and this combination substantially improved the signal to noise ratio and the limit of detection. Ambiguous decline of photo acoustic signal at higher NO2 concentration due to the adsorption of NO2 on the walls of the photoacoustic cells and the dependence of this effect on the buffer gases are also discussed. The PA signal dependence on incident laser energy for three cells was also investigated.
| Original language | English |
|---|---|
| Pages (from-to) | 1406-1412 |
| Number of pages | 7 |
| Journal | Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering |
| Volume | 45 |
| Issue number | 11 |
| DOIs | |
| State | Published - Sep 2010 |
Bibliographical note
Funding Information:The support by the Physics Departments and King Fahd University of Petroleum and Minerals under SABIC project # Sabic 2005/11 is gratefully acknowledged.
Keywords
- Photoacoustic spectroscopy
- pollution monitoring
- trace gas detection
ASJC Scopus subject areas
- Environmental Engineering