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Sensitive And Ultra-Fast Species Detection Using Pulsed Cavity Ringdown Spectroscopy, Et-Touhami Es-Sebbar
Sensitive And Ultra-Fast Species Detection Using Pulsed Cavity Ringdown Spectroscopy, Et-Touhami Es-Sebbar
Dr. Et-touhami Es-sebbar
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 …