In-situ measurement of pyrolysis and combustion gases from biomass burning using swept wavelength external cavity quantum cascade lasers

M. C. Phillips, T. L. Myers, T. J. Johnson, D. R. Weise

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Broadband high-speed absorption spectroscopy using swept-wavelength external cavity quantum cascade lasers (ECQCLs) is applied to measure multiple pyrolysis and combustion gases in biomass burning experiments. Two broadly-tunable swept-ECQCL systems were used, with the first tuned over a range of 2089-2262 cm−1 (4.42-4.79 µm) to measure spectra of CO2, H2O, and CO. The second was tuned over a range of 920-1150 cm−1 (8.70-10.9 µm) to measure spectra of ammonia (NH3), ethene (C2H4), and methanol (MeOH). Absorption spectra were measured continuously at a 100 Hz rate throughout the burn process, including inhomogeneous flame regions, and analyzed to determine time-resolved gas concentrations and temperature. The results provide in-situ, dynamic information regarding gas-phase species as they are generated, close to the biomass fuel source.

Original languageEnglish (US)
Pages (from-to)8680-8700
Number of pages21
JournalOptics Express
Volume28
Issue number6
DOIs
StatePublished - Mar 16 2020

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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