Applicability of Infrared Emission and Absorption Spectra to Determination of Hot Gas Temperature Profiles

Tourin, Richard H.; Krakow, Burton

doi:10.1364/ao.4.000237

Cited by 22 publications

(7 citation statements)

References 7 publications

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“…9 shows. Second, the results, e.g., in [1][2][3][4]19,20,24,32] and, in particular, those obtained using a different technique (CARS) [5], do not exhibit significant fluctuations in k m r like those in Fig. 9.…”

Section: A Example 1-reconstructing From Modeled Input Datamentioning

confidence: 65%

“…A problem of infrared (IR) tomography [1][2][3][4] of a hot gaseous medium, e.g., flame, is considered in this work. IR tomography has numerous applications including the determination of hot gas absorption, emission, and temperature profiles in a cross section of a laboratory burner flame [5], plasma [6][7][8][9], flame inside a boiler, furnace, or steam generator [10], and hot gas flow [11], e.g., one from a rocket nozzle; -IR spectroscopic tomography of temperature and gaseous species concentrations as the diagnostics of pulverized coal or biomass firing and burning [11]; laser-based thermometry as the coherent anti-Stokes Raman scattering (CARS) measurements (point diagnostics) of a laboratory burner flame [5]; stratified atmosphere parameters determination (temperature, pressure, absorption, emission, etc.)…”

Section: Introductionmentioning

confidence: 99%

“…That yields two integral equations (IE) with respect to k and B. However, often only the ON mode is considered [2,3], which yields only one equation, either differential or integral, with respect to those two unknown functions. In that case, it is often assumed that the coefficient k is already measured in some way or determined using the spectroscopic databases, e.g., HITRAN/HITEMP [21,22] or others.…”

Section: Introductionmentioning

confidence: 99%

“…Note also that although both the active (ON) and passive (OFF) measurement modes were used in [2][3][4][6][7][8][9][10], the problem was not reduced to the system of two IEs.…”

Section: Introductionmentioning

confidence: 99%

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Direct and inverse problems of infrared tomography

et al. 2015

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The problems of infrared tomography-direct (the modeling of measured functions) and inverse (the reconstruction of gaseous medium parameters)-are considered with a laboratory burner flame as an example of an application. The two measurement modes are used: active (ON) with an external IR source and passive (OFF) without one. Received light intensities on detectors are modeled in the direct problem or measured in the experiment whereas integral equations with respect to the absorption coefficient and Planck function (which yields the temperature profile of the medium) are solved in the inverse problem with (1) modeled and (2) measured received intensities as the input data. An axisymmetric flame and parallel scanning scheme of measurements considered in this work yield singular integral equations that are solved numerically using the generalized quadrature method, spline smoothing, and Tikhonov regularization. A software package in MATLAB has been developed. Two numerical examples-with modeled and real input data-were solved. The proposed methodology avoids the necessity of elaborate determination of the absorption coefficient by direct (point) measurements or calculation using spectroscopic databases (e.g., HITRAN/HITEMP).

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Section: A Example 1-reconstructing From Modeled Input Datamentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Note also that although both the active (ON) and passive (OFF) measurement modes were used in [2][3][4][6][7][8][9][10], the problem was not reduced to the system of two IEs.…”

Section: Introductionmentioning

confidence: 99%

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Direct and inverse problems of infrared tomography

et al. 2015

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“…If we number these zones serially from 1 to n, with zone 1 nearest the detector, the irradiance of the detector, H(X,-), by monochromatic radiation of wavelength Ay, is given 1 by Eq. (1) n r h (\j) (i) A=0 W b (\j, Ti) is the Planck function at wavelength A/ and the temperature Ti of zone i. T»(X,-) denotes the transmittance of zone i at X,-. The right side of Eq.…”

Section: Emittance Equationsmentioning

confidence: 99%