Applied Physics B

, Volume 74, Issue 3, pp 273–278

Resonant photoacoustic simultaneous detection of methane and ethylene by means. of a 1.63-μm diode laser

  • A. Boschetti
  • D. Bassi
  • E. Iacob
  • S. Iannotta
  • L. Ricci
  • M. Scotoni
Article

Abstract

A compact multi-component trace-gas detector based on the resonant photoacoustic technique and a NIR external cavity diode laser has been developed. It has been characterized using a mixture of ethylene and methane diluted in ambient air. A spectroscopic investigation of combination bands and overtones between 5900 and 6250 cm-1, obtained with an IR pulsed laser photoacoustic spectrometer, allowed us to find a wavelength region where the 2ν3 overtone of CH4 and the ν59 combination band of C2H4 show uncongested rotational lines. Using a single-mode scan of the diode laser in this region, around 6150 cm-1, the sensitivity for the simultaneous detection of ethylene and methane is 8 ppm/mW and 40 ppm/mW respectively. Factors affecting the sensitivity and selectivity of the detection system and possible improvements suitable to reach the sub-ppm detection limit are discussed.

PACS: 42.62.Fi; 42.55.Px; 82.80.Ch 

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Copyright information

© Springer-Verlag 2002

Authors and Affiliations

  • A. Boschetti
    • 1
  • D. Bassi
    • 2
  • E. Iacob
    • 2
  • S. Iannotta
    • 1
  • L. Ricci
    • 2
  • M. Scotoni
    • 2
  1. 1.Centro Fisica degli Stati Aggregati, CNR-ITCPovo, TrentoItaly
  2. 2.Università di Trento, Dipartimento di Fisica and INFMPovo, TrentoItaly

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