Intracavity laser absorption spectroscopy of flames. Concentration measurements of intermediate species

S. Cheskis; I. Derzy; V. A. Lozovsky; A. Kachanov; F. Stoeckel

doi:10.1117/12.279761

Intracavity laser absorption spectroscopy of flames. Concentration measurements of intermediate species

S. Cheskis^*, I. Derzy, V. A. Lozovsky, A. Kachanov, F. Stoeckel

^*Corresponding author for this work

School of Chemistry

Research output: Contribution to journal › Conference article › peer-review

Abstract

Intracavity Laser Absorption Spectroscopy (ICLAS) was used to study concentration profiles of several radicals in flames. Very high sensitivity of ICLAS enables quantitative measurements of absolute concentrations of atoms and radicals in flames. Most of the experiments were done with a flat flame burner placed inside the cavity of a broad band dye laser. The spectra of HCO radicals (Ã² A" ← X̃² A' transition) and CH₂ radical, in the singlet electronic state were measured with a high signal-to-noise ratio at different positions above the burner. In this work we report the measurement of the concentration profiles of HCO and CH ₂ radicals in methane/air flame. The spectra of these two radicals can be measured simultaneously which is advantageous in combustion diagnostics. Cavity Ring-Down Laser Spectroscopy (CRDS) was used to measure the OH concentration profile and the rotational temperature profile in the flame. The measured concentration profiles of the HCO and OH radicals are in reasonable agreement with computer simulation results. However, a rough estimation of the CH₂ absolute concentration indicates a much higher concentration than that which can be predicted based on the model calculation..

Original language	English
Pages (from-to)	618-626
Number of pages	9
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	3172
DOIs	https://doi.org/10.1117/12.279761
State	Published - 1997
Event	Optical Technology in Fluid, Thermal, and Combustion Flow III - San Diego, CA, United States Duration: 28 Jul 1997 → 28 Jul 1997

Keywords

Absorption spectroscopy
CH radical
Flames
HCO radical
Lasers
OH radical

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10.1117/12.279761

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title = "Intracavity laser absorption spectroscopy of flames. Concentration measurements of intermediate species",

abstract = "Intracavity Laser Absorption Spectroscopy (ICLAS) was used to study concentration profiles of several radicals in flames. Very high sensitivity of ICLAS enables quantitative measurements of absolute concentrations of atoms and radicals in flames. Most of the experiments were done with a flat flame burner placed inside the cavity of a broad band dye laser. The spectra of HCO radicals ({\~A}2 A{"} ← {\~X}2 A' transition) and CH2 radical, in the singlet electronic state were measured with a high signal-to-noise ratio at different positions above the burner. In this work we report the measurement of the concentration profiles of HCO and CH 2 radicals in methane/air flame. The spectra of these two radicals can be measured simultaneously which is advantageous in combustion diagnostics. Cavity Ring-Down Laser Spectroscopy (CRDS) was used to measure the OH concentration profile and the rotational temperature profile in the flame. The measured concentration profiles of the HCO and OH radicals are in reasonable agreement with computer simulation results. However, a rough estimation of the CH2 absolute concentration indicates a much higher concentration than that which can be predicted based on the model calculation..",

keywords = "Absorption spectroscopy, CH radical, Flames, HCO radical, Lasers, OH radical",

author = "S. Cheskis and I. Derzy and Lozovsky, {V. A.} and A. Kachanov and F. Stoeckel",

year = "1997",

doi = "10.1117/12.279761",

language = "אנגלית",

volume = "3172",

pages = "618--626",

journal = "Proceedings of SPIE - The International Society for Optical Engineering",

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AU - Cheskis, S.

AU - Derzy, I.

AU - Lozovsky, V. A.

AU - Kachanov, A.

AU - Stoeckel, F.

PY - 1997

Y1 - 1997

N2 - Intracavity Laser Absorption Spectroscopy (ICLAS) was used to study concentration profiles of several radicals in flames. Very high sensitivity of ICLAS enables quantitative measurements of absolute concentrations of atoms and radicals in flames. Most of the experiments were done with a flat flame burner placed inside the cavity of a broad band dye laser. The spectra of HCO radicals (Ã2 A" ← X̃2 A' transition) and CH2 radical, in the singlet electronic state were measured with a high signal-to-noise ratio at different positions above the burner. In this work we report the measurement of the concentration profiles of HCO and CH 2 radicals in methane/air flame. The spectra of these two radicals can be measured simultaneously which is advantageous in combustion diagnostics. Cavity Ring-Down Laser Spectroscopy (CRDS) was used to measure the OH concentration profile and the rotational temperature profile in the flame. The measured concentration profiles of the HCO and OH radicals are in reasonable agreement with computer simulation results. However, a rough estimation of the CH2 absolute concentration indicates a much higher concentration than that which can be predicted based on the model calculation..

AB - Intracavity Laser Absorption Spectroscopy (ICLAS) was used to study concentration profiles of several radicals in flames. Very high sensitivity of ICLAS enables quantitative measurements of absolute concentrations of atoms and radicals in flames. Most of the experiments were done with a flat flame burner placed inside the cavity of a broad band dye laser. The spectra of HCO radicals (Ã2 A" ← X̃2 A' transition) and CH2 radical, in the singlet electronic state were measured with a high signal-to-noise ratio at different positions above the burner. In this work we report the measurement of the concentration profiles of HCO and CH 2 radicals in methane/air flame. The spectra of these two radicals can be measured simultaneously which is advantageous in combustion diagnostics. Cavity Ring-Down Laser Spectroscopy (CRDS) was used to measure the OH concentration profile and the rotational temperature profile in the flame. The measured concentration profiles of the HCO and OH radicals are in reasonable agreement with computer simulation results. However, a rough estimation of the CH2 absolute concentration indicates a much higher concentration than that which can be predicted based on the model calculation..

KW - Absorption spectroscopy

KW - CH radical

KW - Flames

KW - HCO radical

KW - Lasers

KW - OH radical

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T2 - Optical Technology in Fluid, Thermal, and Combustion Flow III

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Intracavity laser absorption spectroscopy of flames. Concentration measurements of intermediate species

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Keywords

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