Sensitive and ultra-fast species detection using pulsed cavity ringdown spectroscopy

Awad Alquaity, Et-touhami Es-sebbar, Aamir Farooq

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

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. © 2015 OSA.
Original languageEnglish (US)
Pages (from-to)7217
JournalOptics Express
Volume23
Issue number6
DOIs
StatePublished - Mar 10 2015

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