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Applied Optics

Applied Optics


  • Vol. 42, Iss. 21 — Jul. 20, 2003
  • pp: 4396–4399

Detection of methane with high spatial resolution with photothermal deflection spectroscopy

Yunjing Li and Rajendra Gupta  »View Author Affiliations

Applied Optics, Vol. 42, Issue 21, pp. 4396-4399 (2003)

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We demonstrate the use of photothermal deflection spectroscopy for detection and measurement of methane with very high spatial resolution. A high spatial resolution may be important for some applications, and other techniques in current use do not provide this resolution. To the best of our knowledge, this is the first application of photothermal spectroscopy to methane detection. We have succeeded in detecting a signal even from a very weak combination-overtone band of methane in the visible region of the spectrum. If used in conjunction with a strongly absorbing fundamental band, the technique is capable of yielding high sensitivity along with very high spatial and temporal resolutions.

© 2003 Optical Society of America

OCIS Codes
(010.1120) Atmospheric and oceanic optics : Air pollution monitoring
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(300.0300) Spectroscopy : Spectroscopy
(300.6430) Spectroscopy : Spectroscopy, photothermal

Original Manuscript: January 8, 2003
Revised Manuscript: April 14, 2003
Published: July 20, 2003

Yunjing Li and Rajendra Gupta, "Detection of methane with high spatial resolution with photothermal deflection spectroscopy," Appl. Opt. 42, 4396-4399 (2003)

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  1. See, for example, U. Gustafsson, J. Sandsten, S. Svanberg, “Simultaneous detection of methane, oxygen and water vapour utilising near-infrared diode lasers in conjunction with difference-frequency generation,” Appl. Phys. B 71, 853–857 (2000). [CrossRef]
  2. See, for example, C. Fischer, M. W. Sigrist, Q. Yu, M. Seiter, “Photoacoustic monitoring of trace gases by use of a diode-based difference frequency laser source,” Opt. Lett. 26, 1609–1611 (2001). [CrossRef]
  3. See, for example, J. A. Sell, ed., Photothermal Investigations of Solids and Fluids (Academic, N.Y., 1989).
  4. L. P. Giver, “Intensity measurements of the CH4 bands in the region 4350 Å to 10600 Å,” J. Quant. Spectrosc. Radiat. Transfer 19, 311–322 (1978). [CrossRef]
  5. R. Gupta, “The theory of photothermal effect in fluids,” in Photothermal Investigations in Solids and Fluids, J. A. Sell, ed. (Academic, New York, 1989), Chap. 3.
  6. A. Rose, R. Vyas, R. Gupta, “Pulsed photothermal deflection spectroscopy in a flowing medium: a quantitative investigation,” Appl. Opt. 25, 4626–4643 (1986). [CrossRef] [PubMed]
  7. D. R. Lide, H. V. Kehiaian, eds., CRC Handbook of Thermophysical and Thermochemical Data (CRC Press, Boca Raton, Fla., 1994).
  8. G. W. C. Kaye, T. H. Laby, eds., Tables of Physical and Chemical Constants and Some Mathematical Functions (Longman, New York, N.Y., 1982).
  9. U. Fink, D. C. Benner, K. A. Dick, “Band model analysis of laboratory methane absorption spectra from 4500 to 10500 Å,” J. Quant. Spectrosc. Radiat. Transfer 18, 447–457 (1977). [CrossRef]
  10. Y. Li, R. Gupta, “Measurement of absolute minority species concentration and temperature in a flame by the photothermal deflection spectroscopy technique,” Appl. Opt. 42, 2226–2235 (2003). [CrossRef] [PubMed]
  11. D. G. Lancaster, J. M. Dawes, “Methane detection with a narrow-band source at 3.4 µm based on a Nd:YAG pump laser and a combination of stimulated Raman scattering and difference frequency mixing,” Appl. Opt. 35, 4041–4045 (1986). [CrossRef]
  12. See, for example, P. Hess, C. B. Moore, “Vibrational energy-transfer in methane and methane-rare gas mixtures,” J. Chem. Phys. 65, 2339–2344 (1976). [CrossRef]

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