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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 43, Iss. 16 — Jun. 1, 2004
  • pp: 3329–3334

Monitoring of ethylene by a pulsed quantum cascade laser

Damien Weidmann, Anatoliy A. Kosterev, Chad Roller, Robert F. Curl, Matthew P. Fraser, and Frank K. Tittel  »View Author Affiliations


Applied Optics, Vol. 43, Issue 16, pp. 3329-3334 (2004)
http://dx.doi.org/10.1364/AO.43.003329


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Abstract

We report on the development and performance of a gas sensor based on a quantum cascade laser operating at a wavelength of ∼10 μm to measure ethylene (C2H4) concentrations by use of a rotational component of the fundamental ν7 band. The laser is thermoelectrically cooled and operates in a pulsed mode. The influence of pulse-to-pulse fluctuations is minimized by use of a reference beam and a single detector with time discriminating electronics. Gas absorption is recorded in a 100-m optical path-length astigmatic Herriott cell. With a 10-kHz pulse repetition rate and an 80-s total acquisition time, a noise equivalent sensitivity of 30 parts per billion has been demonstrated. The sensor has been applied to monitor C2H4 in vehicle exhaust as well as in air collected in a high-traffic urban tunnel.

© 2004 Optical Society of America

OCIS Codes
(140.5960) Lasers and laser optics : Semiconductor lasers
(280.1120) Remote sensing and sensors : Air pollution monitoring
(280.3420) Remote sensing and sensors : Laser sensors
(300.6320) Spectroscopy : Spectroscopy, high-resolution

History
Original Manuscript: August 26, 2003
Revised Manuscript: November 25, 2003
Published: June 1, 2004

Citation
Damien Weidmann, Anatoliy A. Kosterev, Chad Roller, Robert F. Curl, Matthew P. Fraser, and Frank K. Tittel, "Monitoring of ethylene by a pulsed quantum cascade laser," Appl. Opt. 43, 3329-3334 (2004)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-43-16-3329

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