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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 27 — Dec. 17, 2012
  • pp: 28106–28118

Compact and portable open-path sensor for simultaneous measurements of atmospheric N2O and CO using a quantum cascade laser

Lei Tao, Kang Sun, M. Amir Khan, David J. Miller, and Mark A. Zondlo  »View Author Affiliations

Optics Express, Vol. 20, Issue 27, pp. 28106-28118 (2012)

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A compact and portable open-path sensor for simultaneous detection of atmospheric N2O and CO has been developed with a 4.5 μm quantum cascade laser (QCL). An in-line acetylene (C2H2) gas reference cell allows for continuous monitoring of the sensor drift and calibration in rapidly changing field environments and thereby allows for open-path detection at high precision and stability. Wavelength modulation spectroscopy (WMS) is used to detect simultaneously both the second and fourth harmonic absorption spectra with an optimized dual modulation amplitude scheme. Multi-harmonic spectra containing atmospheric N2O, CO, and the reference C2H2 signals are fit in real-time (10 Hz) by combining a software-based lock-in amplifier with a computationally fast numerical model for WMS. The sensor consumes ~50 W of power and has a mass of ~15 kg. Precision of 0.15 ppbv N2O and 0.36 ppbv CO at 10 Hz under laboratory conditions was demonstrated. The sensor has been deployed for extended periods in the field. Simultaneous N2O and CO measurements distinguished between natural and fossil fuel combustion sources of N2O, an important greenhouse gas with poorly quantified emissions in space and time.

© 2012 OSA

OCIS Codes
(010.1120) Atmospheric and oceanic optics : Air pollution monitoring
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(280.3420) Remote sensing and sensors : Laser sensors
(300.6340) Spectroscopy : Spectroscopy, infrared

ToC Category:
Atmospheric and Oceanic Optics

Original Manuscript: October 5, 2012
Revised Manuscript: November 21, 2012
Manuscript Accepted: November 21, 2012
Published: December 4, 2012

Lei Tao, Kang Sun, M. Amir Khan, David J. Miller, and Mark A. Zondlo, "Compact and portable open-path sensor for simultaneous measurements of atmospheric N2O and CO using a quantum cascade laser," Opt. Express 20, 28106-28118 (2012)

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  1. Intergovernmental Panel on Climate Change, “Climate Change 2007: Synthesis Report,” Core Writing Team, Pachauri, R.K. and Reisinger, A, eds. (Geneva, SwitzerLand, 2008)
  2. S. A. Montzka, E. J. Dlugokencky, and J. H. Butler, “Non-CO2 greenhouse gases and climate change,” Nature 476(7358), 43–50 (2011). [CrossRef] [PubMed]
  3. A. R. Ravishankara, J. S. Daniel, and R. W. Portmann, “Nitrous oxide N2O: the dominant ozone-depleting substance emitted in the 21st century,” Science 326(5949), 123–125 (2009). [CrossRef] [PubMed]
  4. L. Joly, T. Decarpenterie, N. Dumelie, X. Thomas, I. Mappe-Fogaing, D. Mammez, R. Vallon, G. Durry, B. Parvitte, M. Carras, X. Marcadet, and V. Zeninari, “Development of a versatile atmospheric N2O sensor based on quantum cascade laser technology at 4.5 ?m,” Appl. Phys. B: Lasers Opt. 103(3), 717–723 (2011). [CrossRef]
  5. A. Neftel, C. Flechard, C. Ammann, F. Conen, L. Emmenegger, and K. Zeyer, “Experimental assessment of N2O background fluxes in grassland systems,” Tellus B Chem. Phys. Meterol. 59(3), 470–482 (2007). [CrossRef]
  6. R. Provencal, M. Gupta, T. G. Owano, D. S. Baer, K. N. Ricci, A. O’Keefe, and J. R. Podolske, “Cavity-enhanced quantum-cascade laser-based instrument for carbon monoxide measurements,” Appl. Opt. 44(31), 6712–6717 (2005). [CrossRef] [PubMed]
  7. A. D. Farinas, D. Balslev-Clausen, and E. Crosson, “A Mid-IR, wavelength-scanned, cavity ring-down spectrometer for continuous trace N2O and nitrogen isotope measurements,” abstract #B53C–0409, in American Geophysical Union, Fall Meeting (San Francisco, 2009).
  8. J. P. Lima, H. Vargas, A. Miklos, M. Angelmahr, and P. Hess, “Photoacoustic detection of NO2 and N2O using quantum cascade lasers,” Appl. Phys. B: Lasers Opt. 85(2-3), 279–284 (2006). [CrossRef]
  9. S. Borri, S. Bartalini, P. De Natale, M. Inguscio, C. Gmachl, F. Capasso, D. L. Sivco, and A. Y. Cho, “Frequency modulation spectroscopy by means of quantum-cascade lasers,” Appl. Phys. B: Lasers Opt. 85(2-3), 223–229 (2006). [CrossRef]
  10. C. Guimbaud, V. Catoire, S. Gogo, C. Robert, M. Chartier, F. Laggoun-Defarge, A. Grossel, P. Alberic, L. Pomathiod, B. Nicoullaud, and G. Richard, “A portable infrared laser spectrometer for flux measurements of trace gases at the geosphere-atmosphere interface,” Meas. Sci. Technol. 22(7), 075601 (2011). [CrossRef]
  11. D. McDermitt, G. Burba, L. Xu, T. Anderson, A. Komissarov, B. Riensche, J. Schedlbauer, G. Starr, D. Zona, W. Oechel, S. Oberbauer, and S. Hastings, “A new low-power, open-path instrument for measuring methane flux by eddy covariance,” Appl. Phys. B: Lasers Opt. 102(2), 391–405 (2011). [CrossRef]
  12. J. Chen, A. Hangauer, R. Strzoda, and M. C. Amann, “VCSEL-based calibration-free carbon monoxide sensor at 2.3 ?m with in-line reference cell,” Appl. Phys. B: Lasers Opt. 102(2), 381–389 (2011). [CrossRef]
  13. K. Sun, L. Tao, D. J. Miller, M. A. Khan, and M. A. Zondlo, “Inline Multi-harmonic Calibration Method for Open-path Atmospheric Ammonia Measurements,” Appl. Phys. B-Lasers O. doi:10.1007/s00340-012-5231-2 (2012). [CrossRef]
  14. P. Kluczynski and O. Axner, “Theoretical description based on Fourier analysis of wavelength-modulation spectrometry in terms of analytical and background signals,” Appl. Opt. 38(27), 5803–5815 (1999). [CrossRef] [PubMed]
  15. P. Kluczynski, A. M. Lindberg, and O. Axner, “Background signals in wavelength-modulation spectrometry with frequency-doubled diode-laser light. I. Theory,” Appl. Opt. 40(6), 783–793 (2001). [CrossRef] [PubMed]
  16. M. A. Zondlo, M. E. Paige, S. M. Massick, and J. A. Silver, “Vertical cavity laser hygrometer for the National Science Foundation Gulfstream-V aircraft,” J. Geophys. Res., [Atmos.] 115(D20), D20309 (2010). [CrossRef]
  17. S. Schilt, L. Thévenaz, and P. Robert, “Wavelength modulation spectroscopy: combined frequency and intensity laser modulation,” Appl. Opt. 42(33), 6728–6738 (2003). [CrossRef] [PubMed]
  18. H. J. Li, G. B. Rieker, X. Liu, J. B. Jeffries, and R. K. Hanson, “Extension of wavelength-modulation spectroscopy to large modulation depth for diode laser absorption measurements in high-pressure gases,” Appl. Opt. 45(5), 1052–1061 (2006). [CrossRef] [PubMed]
  19. J. Reid and D. Labrie, “Second-harmonic detection with tunable diode lasers—comparison of experiment and theory,” Appl. Phys. B: Lasers Opt. 26(3), 203–210 (1981). [CrossRef]
  20. S. Schilt and L. Thévenaz, “Experimental method based on wavelength-modulation spectroscopy for the characterization of semiconductor lasers under direct modulation,” Appl. Opt. 43(22), 4446–4453 (2004). [CrossRef] [PubMed]
  21. A. Neftel, C. Ammann, C. Fischer, C. Spirig, F. Conen, L. Emmenegger, B. Tuzson, and S. Wahlen, “N2O exchange over managed grassland: Application of a quantum cascade laser spectrometer for micrometeorological flux measurements,” Agric. For. Meteorol. 150(6), 775–785 (2010). [CrossRef]
  22. L. S. Rothman, I. E. Gordon, A. Barbe, D. C. Benner, P. F. Bernath, M. Birk, V. Boudon, L. R. Brown, A. Campargue, J.-P. Champion, K. Chance, L. H. Coudert, V. Dana, V. M. Devi, S. Fally, J.-M. Flaud, R. R. Gamache, A. Goldman, D. Jacquemart, I. Kleiner, N. Lacome, W. Lafferty, J.-Y. Mandin, S. T. Massie, S. N. Mikhailenko, C. E. Miller, N. Moazzen-Ahmadi, O. V. Naumenko, A. V. Nikitin, J. Orphal, V. I. Perevalov, A. Perrin, A. Predoi-Cross, C. P. Rinsland, M. Rotger, M. Simeckova, M. A. H. Smith, K. Sung, S. A. Tashkun, J. Tennyson, R. A. Toth, A. C. Vandaele, and J. Vander Auwera, “The HITRAN 2008 molecular spectroscopic database,” J. Quant. Spectrosc. Radiat. Transf. 110(9-10), 533–572 (2009). [CrossRef]
  23. L. Tao, K. Sun, D. J. Miller, M. A. Khan, and M. A. Zondlo, “Current and frequency modulation characteristics for continuous-wave quantum cascade lasers at 9.06 ?m,” Opt. Lett. 37(8), 1358–1360 (2012). [CrossRef] [PubMed]
  24. J. A. Silver, “Simple Dense-pattern Optical Multipass Cells,” Appl. Opt. 44(31), 6545–6556 (2005). [CrossRef] [PubMed]
  25. J. B. McManus, P. L. Kebabian, and M. S. Zahniser, “Astigmatic mirror multipass absorption cells for long-path-length spectroscopy,” Appl. Opt. 34(18), 3336–3348 (1995). [CrossRef] [PubMed]
  26. R. A. Whitby and E. R. Altwicker, “Acetylene in the atmosphere: Sources, representative ambient concentrations and ratios to other hydrocarbons,” Atmos. Environ. 12(6-7), 1289–1296 (1978). [CrossRef]
  27. A. Hangauer, J. Chen, R. Strzoda, and M.-C. Amann, “Multi-harmonic detection in wavelength modulation spectroscopy systems,” Appl. Phys. B-Lasers O. doi:10.1007/s00340-012-5049-y (2012). [CrossRef]
  28. G. B. Rieker, J. B. Jeffries, and R. K. Hanson, “Calibration-free wavelength-modulation spectroscopy for measurements of gas temperature and concentration in harsh environments,” Appl. Opt. 48(29), 5546–5560 (2009). [CrossRef] [PubMed]
  29. P. Werle, R. Mücke, and F. Slemr, “The limits of signal averaging in atmospheric trace-gas monitoring by tunable diode-laser absorption spectroscopy (TDLAS),” Appl. Phys. B: Lasers Opt. 57, 131–139 (1993). [CrossRef]
  30. D. Zona, I. A. Janssens, M. S. Verlinden, L. S. Broeckx, J. Cools, B. Gioli, A. Zaldei, and R. Ceulemans, “Impact of extreme precipitation and water table change on N2O fluxes in a bio-energy poplar plantation,” Biogeosciences Discuss. 8(2), 2057–2092 (2011). [CrossRef]
  31. J. Dick, U. Skiba, and J. Wilson, “The effect of rainfall on NO and N2O emissions from Ugandan agroforest soils,” Phyton (Austria) 41, 73–80 (2001).
  32. US EPA, “Emission Facts: Average Annual Emissions and Fuel Consumption for Passenger Cars and Light Trucks,” Office of Transportation and Air Quality, ed. (2000).
  33. US EPA, “Update of Methane and Nitrous Oxide Emission Factors for On-Highway Vehicles,” Office of Transportation and Air Quality, ed. (2004).
  34. D. E. Burch, E. B. Singleton, and D. Williams, “Absorption line broadening in the infrared,” Appl. Opt. 1(3), 359–363 (1962). [CrossRef]

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