Multispecies absorption spectroscopy of detonation events at 100kHz using a fiber-coupled, time-division-multiplexed quantum-cascade-laser system

A mid-infrared fiber-coupled laser system constructed around three time-division-multiplexed quantum-cascade lasers capable of measuring the absorption spectra of CO, CO sub(2), and N sub(2) O at 100 kHz over a wide range of operating pressures and temperatures is demonstrated. This system is first...

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Bibliographic Details
Published in:Applied optics (2004) 2016-08, Vol.55 (23), p.6256-6262
Main Authors: Rein, Keith D, Roy, Sukesh, Sanders, Scott T, Caswell, Andrew W, Schauer, Frederick R, Gord, James R
Format: Article
Language:English
Subjects:
Absorption spectra
Absorption spectroscopy
Blowdown
Carbon dioxide
Carbon monoxide
Detonation
Fluctuation
Lasers
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Summary:A mid-infrared fiber-coupled laser system constructed around three time-division-multiplexed quantum-cascade lasers capable of measuring the absorption spectra of CO, CO sub(2), and N sub(2) O at 100 kHz over a wide range of operating pressures and temperatures is demonstrated. This system is first demonstrated in a laboratory burner and then used to measure temperature, pressure, and concentrations of CO, CO sub(2), and N sub(2) O as a function of time in a detonated mixture of N sub(2) O and C sub(3) H sub(8). Both fuel-rich and fuel-lean detonation cases are outlined. High-temperature fluctuations during the blowdown are observed. Concentrations of CO are shown to decrease with time for fuel-lean conditions and increase for fuel-rich conditions.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.55.006256