Effect of Spectral Line Broadening and Instrument Function on the Spectrum of a Mid-Infrared Flare in a Realistic Environment

Kiwook Han, Wondong Lee, Jae Won Hahn

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Assessing the similarity between an actual signal from a mid-infrared (IR) flare and the signal emission of a flame from an aircraft requires exact knowledge of the theoretical modeling of the flare’s spectrum. In this study, we model the spectrum of an IR flare by considering line-by-line modeling and measurement conditions. First, we calculate the parameters of the spectral lines of a mid-IR flare using the high-temperature molecular spectroscopic database (HITEMP) and the chemical parameters of the IR flare with the combustion model in the thermodynamic equilibrium condition. To calculate the exact spectral line shape function, we introduce spectral line broadening for each spectral line in the IR flare. We also introduce the instrument function of the spectrometer to calculate the measured spectrum of the IR flare. In consideration of realistic measurement environments, we calculate the atmospheric transmission with varying altitudes, measurement angles, and humidity, and obtain the spectra of the IR flare in those conditions. To verify the spectrum model, we confirm that the calculated spectrum is in good agreement with experimental data for the IR flare.

Original languageEnglish
Pages (from-to)1152-1164
Number of pages13
JournalCombustion Science and Technology
Volume188
Issue number7
DOIs
Publication statusPublished - 2016 Jul 2

Fingerprint

flares
line spectra
Infrared radiation
shape functions
Angle measurement
thermodynamic equilibrium
Spectrometers
Atmospheric humidity
aircraft
line shape
humidity
flames
Aircraft
Thermodynamics
spectrometers

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Physics and Astronomy(all)

Cite this

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abstract = "Assessing the similarity between an actual signal from a mid-infrared (IR) flare and the signal emission of a flame from an aircraft requires exact knowledge of the theoretical modeling of the flare’s spectrum. In this study, we model the spectrum of an IR flare by considering line-by-line modeling and measurement conditions. First, we calculate the parameters of the spectral lines of a mid-IR flare using the high-temperature molecular spectroscopic database (HITEMP) and the chemical parameters of the IR flare with the combustion model in the thermodynamic equilibrium condition. To calculate the exact spectral line shape function, we introduce spectral line broadening for each spectral line in the IR flare. We also introduce the instrument function of the spectrometer to calculate the measured spectrum of the IR flare. In consideration of realistic measurement environments, we calculate the atmospheric transmission with varying altitudes, measurement angles, and humidity, and obtain the spectra of the IR flare in those conditions. To verify the spectrum model, we confirm that the calculated spectrum is in good agreement with experimental data for the IR flare.",
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Effect of Spectral Line Broadening and Instrument Function on the Spectrum of a Mid-Infrared Flare in a Realistic Environment. / Han, Kiwook; Lee, Wondong; Hahn, Jae Won.

In: Combustion Science and Technology, Vol. 188, No. 7, 02.07.2016, p. 1152-1164.

Research output: Contribution to journalArticle

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