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Applied Physics B

, Volume 70, Issue 6, pp 895–901 | Cite as

Mobile laser spectrometer with novel resonant multipass photoacoustic cell for trace-gas sensing

  • M. Nägele
  • M.W. Sigrist

Abstract.

The development and application of a mobile laser-photoacoustic spectrometer for in situ multicomponent monitoring of trace gases in different environments is reported. Sub-ppbV (<10-9 per volume)-concentrations can be measured with a novel resonant multipass photoacoustic cell. The cell is designed for flow mode operation in order to reduce adsorption effects. For ethene (C2H4) buffered in synthetic air a minimum detection limit of 70 ppt V (70×10-12 per volume) is achieved corresponding to a minimum measurable absorption coefficient αmin=2×10-9 cm-1 for a signal-to-noise ratio of 3. The multicomponent capability of the system is demonstrated with continuous sequential measurements of ethene, methanol, ethanol, CO2, and H2O of air from a fruit storage chamber.

PACS: 82.Ch 

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Copyright information

© Springer-Verlag 2000

Authors and Affiliations

  • M. Nägele
    • 1
  • M.W. Sigrist
    • 1
  1. 1.Swiss Federal Institute of Technology (ETH), Institute of Quantum Electronics, Laboratory for Laser Spectroscopy and Environmental Sensing, 8093 Zürich, Switzerland (Fax: +41-1/633-1077, E-mail: sigrist@iqe.phys.ethz.ch)CH

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