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

Awad B.S. Alquaity | Zendy; Et-touhami Es-sebbar | Zendy; Aamir Farooq | Zendy

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

Author(s) -

Awad B.S. Alquaity,

Et-touhami Es-sebbar,

Aamir Farooq

Publication year - 2015

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.23.007217

Subject(s) - materials science , detection limit , optics , spectroscopy , bar (unit) , cavity ring down spectroscopy , shock tube , analytical chemistry (journal) , sensitivity (control systems) , parts per notation , shock wave , absorption spectroscopy , chemistry , physics , chromatography , organic chemistry , quantum mechanics , electronic engineering , meteorology , thermodynamics , engineering

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.

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