OSA's Digital Library

Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 34, Iss. 18 — Jun. 20, 1995
  • pp: 3257–3266

Pulsed-laser excitation of acoustic modes in open high-Q photoacoustic resonators for trace gas monitoring: results for C2H4

Christian Brand, Andreas Winkler, Peter Hess, András Miklós, Zoltán Bozóki, and János Sneider  »View Author Affiliations


Applied Optics, Vol. 34, Issue 18, pp. 3257-3266 (1995)
http://dx.doi.org/10.1364/AO.34.003257


View Full Text Article

Enhanced HTML    Acrobat PDF (199 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

Abstract

The pulsed excitation of acoustic resonances was studied with a continuously monitoring photoacoustic detector system. Acoustic waves were generated in C2H4/N2 gas mixtures by light absorption of the pulses from a transversely excited atmospheric CO2 laser. The photoacoustic part consisted of high-Q cylindrical resonators (Q factor 820 for the first radial mode in N2) and two adjoining variable acoustic filter systems. The time-resolved signal was Fourier transformed to a frequency spectrum of high resolution. For the first radial mode a Lorentzian profile was fitted to the measured data. The outside noise suppression and the signal-to-noise ratio were investigated in a normal laboratory environment in the flow-through mode. The acoustic and electric filter system combined with the averaging of the photoacoustic signal in the time domain suppressed the outside noise by a factor of 4500 (73 dB). The detection limit for trace gas analysis of ethylene in pure N2 was 2.0 parts in 109 by volume (ppbV) (minimal absorption coefficient αmin = 6.1 × 10−8 cm−1, pulse energy 20 mJ, 1-bar N2), and in environmental air, in which the absorption of other gas components produces a high background signal, we can detect C2H4 to ~180 ppbV. In addition, an alternative experimental technique, in which the maximum signal of the second azimuthal mode was monitored, was tested. To synchronize the sampling rate at the resonance frequency, a resonance tracking system was applied. The detection limit for ethylene measurements was αmin = 9.1 × 10−8 cm−1 for this system.

© 1995 Optical Society of America

History
Original Manuscript: October 5, 1994
Revised Manuscript: January 4, 1995
Published: June 20, 1995

Citation
Christian Brand, Andreas Winkler, Peter Hess, András Miklós, Zoltán Bozóki, and János Sneider, "Pulsed-laser excitation of acoustic modes in open high-Q photoacoustic resonators for trace gas monitoring: results for C2H4," Appl. Opt. 34, 3257-3266 (1995)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-34-18-3257


Sort:  Author  |  Year  |  Journal  |  Reset  

References

  1. L. B. Kreuzer, “Ultralow gas concentration infrared absorption spectroscopy,” J. Appl. Phys. 42, 2934–2943 (1971). [CrossRef]
  2. C. F. Dewey, R. D. Kamm, C. E. Hackett, “Acoustic amplifier for detection of atmospheric pollutants,” Appl. Phys. Lett. 23, 633–635 (1973). [CrossRef]
  3. M. W. Sigrist, S. Bernegger, P. L. Meyer, “Atmospheric and exhaust air monitoring by laser photoacoustic spectroscopy,” in Photoacoustic, Photothermal and Photochemical Processes in Gases, P. Hess, ed., Vol. 46 of Topics in Current Physics (Springer-Verlag, Berlin, Heidelberg, 1989), pp. 173–211. [CrossRef]
  4. M. W. Sigrist, “Air monitoring by laser photoacoustic spectroscopy,” in Air Monitoring by Spectroscopic Techniques, M. W. Sigrist, ed., Vol. 127 of Chemical Analysis (Wiley, New York, 1994), pp. 163–238.
  5. S. Bernegger, M. W. Sigrist, “CO-laser photoacoustic spectroscopy of gases and vapors for trace gas analysis,” Infrared Phys. 30, 375–429 (1990). [CrossRef]
  6. P. L. Meyer, M. W. Sigrist, “Atmospheric pollution monitoring using CO2-laser photoacoustic spectroscopy and other techniques,” Rev. Sci. Instrum. 61, 1779–1807 (1990). [CrossRef]
  7. G. Z. Angeli, Z. Bozóki, András Miklós, András Lörincz, A. Thöny, M. W. Sigrist, “Design and characterization of a windowless resonant photoacoustic chamber equipped with resonance locking circuitry,” Rev. Sci. Instrum. 62, 810–813 (1990). [CrossRef]
  8. A. Karbach, J. Röper, P. Hess, “Computer-controlled performance of photoacoustic resonance experiments,” Rev. Sci. Instrum. 55, 892–895 (1984). [CrossRef]
  9. P. C. Claspy, C. Ha, Y.-H. Pao, “Optoacoustic detection of NO2 using a pulsed dye laser,” Appl. Opt. 16, 2972–2973 (1977). [CrossRef] [PubMed]
  10. M. A. Leugers, G. H. Atkinson, “Quantitative determination of acetaldehyde by pulsed laser photoacoustic spectroscopy,” Anal. Chem. 56, 925–929 (1984). [CrossRef]
  11. M. Fiedler, P. Hess, “Frequency domain analysis of acoustic resonances excited with single laser pulses,” in Photoacoustic and Photothermal Phenomena, J. C. Murphy, J. W. Maclachlan Spicer, L. C. Aamodt, B. S. H. Royce, eds., Vol. 62 of Springer Series in Optical Sciences (Springer-Verlag, Berlin, Heidelberg, 1990), pp. 344–346.
  12. R. Gerlach, N. M. Amer, “Brewster window and windowless resonant spectrophones for intracavity operation,” Appl. Phys. 23, 319–326 (1980). [CrossRef]
  13. A. Miklós, A. Lörincz, “Windowless resonant acoustic chamber for laser-photoacoustic applications,” Appl. Phys. B 48, 213–218 (1989). [CrossRef]
  14. A. Miklós, C. Brand, A. Winkler, P. Hess, “Effective noise reduction on pulsed laser excitation of modes in a high-Q photoacoustic resonator,” J. Phys. IV (Colloque C7) 4, 781–784 (1994).
  15. J. P. M. Trusler, Physical Acoustics and Metrology of Fluids (Hilger, Bristol, 1991), pp. 68–72.
  16. P. M. Morse, K. U. Ingard, Theoretical Acoustics (Princeton U. Press, Princeton, N.J., 1968), pp. 490–492.
  17. R. J. Brewer, C. W. Bruce, J. L. Mater, “Optoacoustic spectroscopy of C2H4 at the 9- and 10-μm C12O2 laser wavelengths,” Appl. Opt. 21, 4092–4100 (1982). [CrossRef] [PubMed]
  18. A. Olafsson, M. Hammerich, J. Henningsen, “Photoacoustic spectroscopy of C2H4 with a tunable waveguide CO2 laser,” Appl. Opt. 31, 2657–2668 (1992). [CrossRef] [PubMed]
  19. L. Giroux, M. H. Back, R. A. Back, “The absorption of pulsed CO2-laser radiation by ethylene at total pressures from 25 to 3000 Torr,” Appl. Phys. B 49, 307–313 (1989). [CrossRef]
  20. F. J. M. Harren, F. G. Bijnen, J. Reuss, L. A. C. J. Voesenek, C. W. P. M. Blom, “Sensitive intracavity photoacoustic measurement with a CO2 waveguide laser,” Appl. Phys. B 50, 137–144 (1990). [CrossRef]

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.


« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited