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

Publiceringsår: 2005
Språk: Engelska
Sidor: 5148-5151
Publikation/Tidskrift/Serie: Applied Optics
Volym: 44
Nummer: 24
Dokumenttyp: Artikel
Förlag: Optical Society of America


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.



  • Atom and Molecular Physics and Optics


  • ISSN: 0003-6935

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