QEPAS spectrophones: design, optimization, and performance
| Autor: | Anatoliy A. Kosterev, David Thomazy, Lei Dong, Frank K. Tittel |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Materials science
Physics and Astronomy (miscellaneous) Atmospheric pressure business.industry General Engineering Analytical chemistry General Physics and Astronomy Optics Signal-to-noise ratio (imaging) Attenuation coefficient Torr Gas detector Gas composition business Sensitivity (electronics) Photoacoustic spectroscopy |
| Zdroj: | Applied Physics B. 100:627-635 |
| ISSN: | 1432-0649 0946-2171 |
| DOI: | 10.1007/s00340-010-4072-0 |
| Popis: | The impact of design parameters of a spectrophone for quartz-enhanced photoacoustic spectroscopy on its performance was investigated. The microresonator of spectrophone is optimized based on an experimental study. The results show that a 4.4 mm-long tube with 0.6 mm inner diameter yields the highest signal-to-noise ratio, which is ∼30 times higher than that of a bare QTF at gas pressures between 400 and 800 Torr. The optimized configuration demonstrates a normalized noise-equivalent absorption coefficient (1σ) of 3.3×10−9 cm−1W/Hz1/2 for C2H2 detection at atmospheric pressure. The effect of the changing carrier gas composition is studied. A side-by-side sensitivity comparison between QEPAS and conventional photoacoustic spectroscopy technique is reported. |
| Databáze: | OpenAIRE |
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