QEPAS spectrophones: design, optimization, and performance
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.
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- 4.A.A. Kosterev, F.K. Tittel, G. Bearman, in Proceedings of the 2008 Int. Conference on Environmental Systems, Published by SAE as MS 08ICES-0031 (2008) Google Scholar
- 5.J.S. Pilgrim, J. Kutzner, W.R. Wood, in Proceedings of the 2007 Int. Conference on Environmental Systems, Published by SAE as MS 2007-01-3152 (2007) Google Scholar
- 29.L.S. Rothman, A. Barbe, D.C. Benner, L.R. Brown, C. Camy-Peyret, M.R. Carleer, K. Chance, C. Clerbaux, V. Dana, V.M. Devi, A. Fayt, J.M. Flaud, R.R. Gamache, A. Goldman, D. Jacquemart, K.W. Jucks, W.J. Lafferty, J.Y. Mandin, S.T. Massie, V. Nemtchinov, D.A. Newnham, A. Perrin, C.P. Rinsland, J. Schroeder, K.M. Smith, M.A.H. Smith, K. Tang, R.A. Toth, J. Vander Auwera, P. Varanasi, K. Yoshino, J. Quant. Spectrosc. Radiat. Transf. 82, 5 (2003) CrossRefADSGoogle Scholar
- 31.S.L. Firebaugh, F. Roignant, E.A. Terray, in Proceedings Comsol Conf., Boston, October 8–10, 2009 Google Scholar