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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 8 — Apr. 21, 2014
  • pp: 9291–9300

Sensitive and rapid laser diagnostic for shock tube kinetics studies using cavity-enhanced absorption spectroscopy

Kai Sun, Shengkai Wang, Ritobrata Sur, Xing Chao, Jay B. Jeffries, and Ronald K. Hanson  »View Author Affiliations


Optics Express, Vol. 22, Issue 8, pp. 9291-9300 (2014)
http://dx.doi.org/10.1364/OE.22.009291


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Abstract

We report the first application of cavity-enhanced absorption spectroscopy (CEAS) using a coherent light source for sensitive and rapid gaseous species time-history measurements in a shock tube. Off-axis alignment and fast scanning of the laser wavelength were used to minimize coupling noise in a low-finesse cavity. An absorption gain factor of 83 with a measurement time resolution of 20 µs was demonstrated for C2H2 detection using a near-infrared transition near 1537 nm, corresponding to a noise-equivalent detection limit of 20 ppm at 296 K and 76 ppm at 906 K at 50 kHz. This substantial gain in signal, relative to conventional single-pass absorption, will enable ultra-sensitive species detection in shock tube kinetics studies, particularly useful for measurements of minor species and for studies of dilute reactive systems.

© 2014 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(300.1030) Spectroscopy : Absorption
(280.1545) Remote sensing and sensors : Chemical analysis

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: February 19, 2014
Revised Manuscript: April 1, 2014
Manuscript Accepted: April 2, 2014
Published: April 9, 2014

Citation
Kai Sun, Shengkai Wang, Ritobrata Sur, Xing Chao, Jay B. Jeffries, and Ronald K. Hanson, "Sensitive and rapid laser diagnostic for shock tube kinetics studies using cavity-enhanced absorption spectroscopy," Opt. Express 22, 9291-9300 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-8-9291


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