Imaging laser-induced fluorescence of oxygen atoms in a flame

Aldén, Marcus; Hertz, Hans M.; Svanberg, Sune; Wallin, Svante

doi:10.1364/ao.23.003255

Cited by 55 publications

(5 citation statements)

References 9 publications

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“…Two-photon absorption laser induced fluorescence (TALIF) is a powerful technique for measuring the density of atomic species in various gaseous environments such as plasmas [1][2][3][4][5][6][7][8][9] and flames [10,11]. In practice, the absolute number density of atomic species is deduced from TALIF signals integrated over the excitation laser wavelength combined with an appropriate calibration procedure [3,7].…”

Section: Introductionmentioning

confidence: 99%

Pressure broadening of atomic oxygen two-photon absorption laser induced fluorescence

Marinov

Drag

Blondel

et al. 2016

Plasma Sources Sci. Technol.

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Atomic oxygen, considered to be a determining reactant in plasma applications at ambient pressure, is routinely detected by two-photon absorption laser induced fluorescence (TALIF).Here, pressure broadening of the (2p 4 3 P 2 → 3p 3 P J=0,1,2 ) two-photon transition in oxygen atoms was investigated using a high-resolution TALIF technique in normal and Doppler-free configurations. The pressure broadening coefficients determined were O2 γ = 0.40 ± 0.08 cm −1 /bar for oxygen molecules and He γ = 0.46 ± 0.03 cm −1 /bar for helium atoms. These correspond to pressure broadening rate constants k PB O 2 = 9 • 10 -9 cm 3 s −1 and k PB He = 4 • 10 −9 cm 3 s −1 , respectively. The well-known quenching rate constants of O(3p 3 P J ) by O 2 and He are at least one order of magnitude smaller, which signifies that non-quenching collisions constitute the main line-broadening mechanism. In addition to providing new insights into collisional processes of oxygen atoms in electronically excited 3p 3 P J state, reported pressure broadening parameters are important for quantification of oxygen TALIF line profiles when both collisional and Doppler broadening mechanisms are important. Thus, the Doppler component (and hence the temperature of oxygen atoms) can be accurately determined from high resolution TALIF measurements in a broad range of conditions.

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Section: Introductionmentioning

confidence: 99%

Pressure broadening of atomic oxygen two-photon absorption laser induced fluorescence

Marinov

Drag

Blondel

et al. 2016

Plasma Sources Sci. Technol.

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“…Extensions of these techniques to other species have been reported by Alden et al (1984c) for measurement of O2, fo llowed by R detection (Alden et al 1984a) and CO (Alden et al 1984b) in a combusting environment. Atomic hydrogen has been measured by Goldsmith & Anderson (1985) using a two-step saturated fluorescence spectroscopy technique.…”

Section: Laser-induced Fluorescencementioning

confidence: 99%

Digital Image Processing in Flow Visualization

Hesselink¹

1988

Annu. Rev. Fluid Mech.

162

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“…The first report of this application was in a study of atomic oxygen, in which the fluorescence along the line defined by the laser beam was imaged onto a one-dimensional intensified-photodiodearray camera, and line images of atomic oxygen were recorded in a single laser pulse [12]. We have used this technique in a laminar hydrogen-air diffusion flame [13], with a series of measurements made at sequential heights above the burner combined to build up the two-dimensional image shown in Fig.…”

Section: Fluorescence Imagingmentioning

confidence: 99%

Multiphoton Excitation Techniques in Combustion Diagnostics

Goldsmith

1988

MRS Proc.

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Multiphoton excitation provides spectroscopic access to several species that are very important in flame studies, but that cannot be detected in combustion environments using conventional optical techniques. This paper describes applications of multiphoton excitation techniques for detecting such species in combustion environments, with an emphasis placed on measurements of atomic hydrogen in flames.

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Imaging laser-induced fluorescence of oxygen atoms in a flame

Cited by 55 publications

References 9 publications

Pressure broadening of atomic oxygen two-photon absorption laser induced fluorescence

Pressure broadening of atomic oxygen two-photon absorption laser induced fluorescence

Digital Image Processing in Flow Visualization

Multiphoton Excitation Techniques in Combustion Diagnostics

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