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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 45, Iss. 9 — Mar. 20, 2006
  • pp: 2077–2088

Applicability of light-emitting diodes as light sources for active differential optical absorption spectroscopy measurements

Christoph Kern, Sebastian Trick, Bernhard Rippel, and Ulrich Platt  »View Author Affiliations


Applied Optics, Vol. 45, Issue 9, pp. 2077-2088 (2006)
http://dx.doi.org/10.1364/AO.45.002077


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Abstract

We present what is to our knowledge the first use of light-emitting diodes (LEDs) as light sources for long-path differential optical absorption spectroscopy (LP-DOAS) measurements of trace gases in the open atmosphere. Modern LEDs represent a potentially advantageous alternative to thermal light sources, in particular to xenon arc lamps, which are the most common active DOAS light sources. The radiative properties of a variety of LEDs were characterized, and parameters such as spectral shape, spectral range, spectral stability, and ways in which they can be influenced by environmental factors were analyzed. The spectra of several LEDs were found to contain Fabry–Perot etalon-induced spectral structures that interfered with the DOAS evaluation, in particular when a constant temperature was not maintained. It was shown that LEDs can be used successfully as light sources in active DOAS experiments that measure NO 2 and NO 3 near 450 and 630   nm , respectively. Average detection limits of 0 .3   parts in 109 and 16 parts in 1012 respectively, were obtained by use of a 6 km light path in the open atmosphere.

© 2006 Optical Society of America

OCIS Codes
(010.1120) Atmospheric and oceanic optics : Air pollution monitoring
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(230.3670) Optical devices : Light-emitting diodes
(280.1120) Remote sensing and sensors : Air pollution monitoring

ToC Category:
Optical Devices

History
Original Manuscript: May 27, 2005
Manuscript Accepted: September 16, 2006

Citation
Christoph Kern, Sebastian Trick, Bernhard Rippel, and Ulrich Platt, "Applicability of light-emitting diodes as light sources for active differential optical absorption spectroscopy measurements," Appl. Opt. 45, 2077-2088 (2006)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-45-9-2077

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