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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 11, Iss. 23 — Nov. 17, 2003
  • pp: 3010–3021

Difference-frequency-generator-based spectrometer at 3 µm for high-sensitivity C2H2 and H2O detection

G. Rusciano, G. Pesce, F. Pignatiello, and A. Sasso  »View Author Affiliations

Optics Express, Vol. 11, Issue 23, pp. 3010-3021 (2003)

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We detect acetylene and water-vapor lines by using a difference-frequency generator in the spectral region around 3 µm. Both C2H2 and H2O lines belong to fundamental vibrational bands and exhibit a line strength of the order of 10-20 cm/mol. Acetylene molecules were detected either by pure absorption or by first-derivative wavelength-modulation spectroscopy. The minimum detection sensitivity achieved for C2H2 in nitrogen was 4 ppb (parts in 109). Moreover, we discuss the effects of C2H2 pressure reduction in the presence of nitrogen in order to estimate systematic errors in the concentration measurements. Finally, we tested the accuracy of our spectrometer by detecting water vapor present as an impurity in a nitrogen cylinder at a nominal concentration of ≃5 ppm.

© 2003 Optical Society of America

OCIS Codes
(010.1120) Atmospheric and oceanic optics : Air pollution monitoring
(300.6340) Spectroscopy : Spectroscopy, infrared

ToC Category:
Research Papers

Original Manuscript: October 9, 2003
Revised Manuscript: October 28, 2003
Published: November 17, 2003

G. Rusciano, G. Pesce, F. Pignatiello, and A. Sasso, "Difference-frequency-generator�??based spectrometer at 3 μm for high-sensitivity C2H2 and H2O detection," Opt. Express 11, 3010-3021 (2003)

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