Open AccessCoherent anti-Stokes Raman spectroscopy measurement of ethylene in combustion
Author(s) -
Andrew D. Cutler,
Emanuela Gallo,
Luca Cantu
Publication year - 2017
Publication title -
applied optics
Language(s) - English
Resource type - Journals
ISSN - 0003-6935
DOI - 10.1364/ao.56.000e30
Subject(s) - raman spectroscopy , materials science , ethylene , spectroscopy , analytical chemistry (journal) , mole fraction , combustion , spectral line , optics , coherent anti stokes raman spectroscopy , coherent spectroscopy , raman scattering , chemistry , physics , biochemistry , chromatography , quantum mechanics , astronomy , catalysis
Width-increased dual-pump enhanced coherent anti-Stokes Raman spectroscopy (WIDECARS) has been developed for spatially and temporally resolved simultaneous measurement of temperature and mole fraction of most major species in ethylene-air flames. This paper describes a method to infer coherent anti-Stokes Raman spectroscopy complex susceptibility distributions of the ν 3 band of ethylene from WIDECARS spectra measured in heated mixtures of ethylene and air, and to use such distributions to fit experimental WIDECARS spectra in an ethylene-air flame. The method is used to measure mole fraction ethylene in a dual-mode supersonic combustor burning premixed ethylene and air with single-laser-shot precision (one standard deviation) of ±0.0025 (absolute).