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Long-path monitoring of NO2 with a 635 nm diode laser using frequency-modulation spectroscopy

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Author

  • Gabriel Somesfalean
  • J Alnis
  • U Gustafsson
  • Hans Edner
  • Sune Svanberg

Summary, in English

In situ monitoring of traffic-generated nitrogen dioxide (NO2) emissions using long-path absorption spectroscopy is reported. High-sensitivity detection of NO2 is achieved by employing two-tone frequencymodulation spectroscopy at a visible absorption band using a tunable high-power diode laser operated around 635 nm. A real-time absorption spectrometer is accomplished by repetitively applying a rectangular current pulse to the diode-laser operating current, allowing detection of isolated NO2 absorption lines. A detection limit of 10 mu g/m(3) for NO2 at atmospheric pressure using a 160 m absorption path is demonstrated. Continuous monitoring of NO2 over a road intersection at peak traffic is performed.

Department/s

Publishing year

2005

Language

English

Pages

5148-5151

Publication/Series

Applied Optics

Volume

44

Issue

24

Document type

Journal article

Publisher

Optical Society of America

Topic

  • Atom and Molecular Physics and Optics

Status

Published

ISBN/ISSN/Other

  • ISSN: 2155-3165