Open AccessSpatially and temporally resolved temperature measurements in counterflow flames using a single interband cascade laser
Author(s) -
Daxin Wen,
Yu Wang
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.411278
Subject(s) - materials science , optics , tunable diode laser absorption spectroscopy , spectroscopy , cascade , absorption (acoustics) , laser , temperature measurement , absorption spectroscopy , diffusion , temporal resolution , tunable laser , physics , chemistry , chromatography , quantum mechanics , thermodynamics
Spatially and temporally resolved temperatures are measured in counterflow diffusion flames with a tunable diode laser absorption spectroscopy (TDLAS) technique based on direct absorption of CO 2 near 4.2 µm. An important aspect of the present work is the reduction of the beam diameter to around 150 µm, thus providing high spatial resolution that is necessary to resolve the high axial temperature gradient in counterflow flames. The temperature non-uniformity was taken into account through both hyperspectral tomography and the multiline technique with profile fitting, with the latter one being capable of providing temporally resolved data. The proposed methods were used to measure four counterflow flames with peak temperature ranging from 1654 to 2720 K, including both non-sooting and sooting ones.