An IH-QCL based gas sensor for simultaneous detection of methane and acetylene
KAUST DepartmentClean Combustion Research Center
Mechanical Engineering Program
Physical Sciences and Engineering (PSE) Division
Online Publication Date2018-06-27
Print Publication Date2018-06
Permanent link to this recordhttp://hdl.handle.net/10754/628287
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AbstractExtended wavelength tuning of an IH-QCL (integrated heater quantum cascade laser) is exploited for simultaneous detection of methane and acetylene using direct absorption spectroscopy. The integrated heater, placed within few microns of the laser active region, enables wider wavelength tuning than would be possible with a conventional DFB (distributed feedback) QCL. In this work, the laser current and heater resistor current are modulated simultaneously at 25 kHz to tune the laser over 1279.6-1280.1 cm, covering absorption transitions of methane and acetylene. The laser is characterized extensively to understand the dependence of wavelength tuning on modulation frequency, modulation amplitude and phase difference between laser/heater modulation. Thereafter, the designed sensor is validated in both room-temperature static cell experiments and non-reactive high-temperature-measurements in methane-acetylene-argon gas mixtures in the shock tube. Finally, the sensor is applied for simultaneous detection of methane and acetylene during the high-temperature pyrolysis of iso-octane behind reflected shock waves.
CitationZhang G, Khabibullin K, Farooq A (2018) An IH-QCL based gas sensor for simultaneous detection of methane and acetylene. Proceedings of the Combustion Institute. Available: http://dx.doi.org/10.1016/j.proci.2018.06.062.
SponsorsResearch reported in this publication was funded by the Office of Sponsored Research at King Abdullah University of Science and Technology (KAUST).