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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 44, Iss. 24 — Aug. 22, 2005
  • pp: 5148–5151

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

Gabriel Somesfalean, Janis Alnis, Ulf Gustafsson, Hans Edner, and Sune Svanberg  »View Author Affiliations


Applied Optics, Vol. 44, Issue 24, pp. 5148-5151 (2005)
http://dx.doi.org/10.1364/AO.44.005148


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Abstract

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 frequency-modulation spectroscopy at a visible absorption band using a tunable high-power diode laser operated around 635nm. 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 μg/m³ for NO2 at atmospheric pressure using a 160m absorption path is demonstrated. Continuous monitoring of NO2 over a road intersection at peak traffic is performed.

© 2005 Optical Society of America

OCIS Codes
(000.0000) General : General

Citation
Gabriel Somesfalean, Janis Alnis, Ulf Gustafsson, Hans Edner, and Sune Svanberg, "Long-path monitoring of NO2 with a 635 nm diode laser using frequency-modulation spectroscopy," Appl. Opt. 44, 5148-5151 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-24-5148


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