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Article
Sensitive and ultra-fast species detection using pulsed cavity ringdown spectroscopy
OPTICS EXPRESS (2015)
  • Et-touhami Es-sebbar
Abstract

Pulsed cavity ringdown spectroscopy (CRDS) is used to develop a novel, ultra-fast, high-sensitivity diagnostic for measuring species concentrations in shock tube experiments. The diagnostic is demonstrated by monitoring trace concentrations of ethylene in the mid-IR region near 949.47 cm−1. Each ringdown measurement is completed in less than 1 μs and the time period between successive pulses is 10 μs. The high sensitivity diagnostic has a noise-equivalent detection limit of 1.08 x 10−5 cm−1 which enables detection of 15 ppm ethylene at fuel pyrolysis conditions (1845 K and 2 bar) and 294 ppb ethylene under ambient conditions (297 K and 1 bar). To our knowledge, this is the first successful application of the cavity ringdown method to the measurement of species time-histories in a shock tube.

Keywords
  • Combustion diagnostics,
  • Chemical analysis,
  • Absorption
Publication Date
March 10, 2015
Citation Information
Et-touhami Es-sebbar. "Sensitive and ultra-fast species detection using pulsed cavity ringdown spectroscopy" OPTICS EXPRESS Vol. 23 Iss. 6 (2015)
Available at: http://works.bepress.com/et-touhami_es-sebbar/60/