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Time-resolved continuous-filtering Vernier spectroscopy of H2O and OH radical in a flame
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.ORCID iD: 0000-0002-5065-7786
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-6191-7926
2019 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 27, no 21, p. 29521-29533Article in journal (Refereed) Published
Abstract [en]

We use broadband near-infrared continuous-filtering Vernier spectroscopy (CF-VS) for time-resolved detection of H2O and OH radical in a premixed CH4/air flat flame. The CF-VS spectrometer is based on a femtosecond Er:fiber laser, an external cavity that contains the flame, and a detection system comprising a rotating diffraction grating and photodetectors. Spectra of H2O and OH radical around 1570 nm are continuously recorded with 6.6 GHz spectral resolution, 4.0 x 10-7 cm-1 absorption sensitivity, and 25 ms time resolution, while the fuel-air equivalence ratio is periodically modulated with a square wave. The concentrations of the two analytes are retrieved with percent level precision by a fit of a Vernier model to each spectrum spanning 13 nm. The temporal profiles of both concentrations in each modulation cycle are repeatable and the steady-state concentration levels are in good agreement with predictions based on one-dimensional simulations of a static flat flame. The robust CF-VS spectrometer opens up for quantitative monitoring of multiple products of time-varying combustion processes with relatively simple data acquisition procedures.

Place, publisher, year, edition, pages
Optical Society of America, 2019. Vol. 27, no 21, p. 29521-29533
Keywords [en]
Acoustooptic modulators, Cavity ring down spectroscopy, Coupling efficiency, Diffraction gratings, Fourier transform spectroscopy, Polarization maintaining fibers
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:umu:diva-164253DOI: 10.1364/OE.27.029521ISI: 000489954500006PubMedID: 31684212OAI: oai:DiVA.org:umu-164253DiVA, id: diva2:1362138
Funder
Knut and Alice Wallenberg Foundation, KAW 2015.0159Available from: 2019-10-18 Created: 2019-10-18 Last updated: 2019-11-11Bibliographically approved

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Lu, ChuangVieira, Francisco SennaSchmidt, Florian M.Foltynowicz, Aleksandra
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