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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 15 — May. 20, 2000
  • pp: 2480–2486

Development of a cavity ringdown laser absorption spectrometer for detection of trace levels of mercury

Scott Spuler, Mark Linne, Andy Sappey, and Stuart Snyder  »View Author Affiliations


Applied Optics, Vol. 39, Issue 15, pp. 2480-2486 (2000)
http://dx.doi.org/10.1364/AO.39.002480


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Abstract

A potential new laser-based air pollution measurement technique, capable of measuring ultralow concentrations of urban air toxins in the field and in real time, is examined. Cavity ringdown laser absorption spectroscopy (CRLAS) holds promise as an air pollution monitor because it is a highly sensitive species detection technique that uses either pulsed or continuous tunable laser sources. The sensitivity results from an extremely long absorption path length and the fact that the quantity measured, the cavity decay time, is unaffected by fluctuations in the laser source. In laboratory experiments, we reach detection limits for mercury of the order of 0.50 parts per trillion. We developed a CRLAS system in our laboratory and measured Hg with the system, investigating issues such as background interference. We report experimental results for mercury detection limits, the dynamic range of the sensor, detection of Hg in an absorbing background of ozone and SO2, and detection of a mercury-containing compound (HgCl2 in this case).

© 2000 Optical Society of America

OCIS Codes
(010.1120) Atmospheric and oceanic optics : Air pollution monitoring
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(230.0230) Optical devices : Optical devices
(300.1030) Spectroscopy : Absorption
(300.6540) Spectroscopy : Spectroscopy, ultraviolet

History
Original Manuscript: July 19, 1999
Revised Manuscript: January 28, 2000
Published: May 20, 2000

Citation
Scott Spuler, Mark Linne, Andy Sappey, and Stuart Snyder, "Development of a cavity ringdown laser absorption spectrometer for detection of trace levels of mercury," Appl. Opt. 39, 2480-2486 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-15-2480


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