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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 44, Iss. 14 — May. 10, 2005
  • pp: 2887–2894

Real-time trace-level detection of carbon dioxide and ethylene in car exhaust gases

Michael T. McCulloch, Nigel Langford, and Geoffrey Duxbury  »View Author Affiliations


Applied Optics, Vol. 44, Issue 14, pp. 2887-2894 (2005)
http://dx.doi.org/10.1364/AO.44.002887


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Abstract

A direct-absorption spectrometer, based on a pulsed, distributed feedback, quantum cascade laser with a 10.26-µm wavelength and an astigmatic Herriott cell with a 66-m path length, has been developed for high-resolution IR spectroscopy. This spectrometer utilizes the intrapulse method, an example of sweep integration, in which the almost linear wavelength up-chirp obtained from a distributed feedback, quantum cascade laser yields a spectral microwindow of as many as 2.5 wave numbers/cm^-1. Within this spectral microwindow, molecular fingerprints can be monitored and recorded in real time. This system allows both the detection of carbon dioxide and ethylene and the real-time observation of the evolution of these gases in the exhaust by-products from several cars.

© 2005 Optical Society of America

OCIS Codes
(010.1120) Atmospheric and oceanic optics : Air pollution monitoring
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(280.1740) Remote sensing and sensors : Combustion diagnostics
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(300.6340) Spectroscopy : Spectroscopy, infrared
(300.6390) Spectroscopy : Spectroscopy, molecular

Citation
Michael T. McCulloch, Nigel Langford, and Geoffrey Duxbury, "Real-time trace-level detection of carbon dioxide and ethylene in car exhaust gases," Appl. Opt. 44, 2887-2894 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-14-2887


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