Single laser detection of CO and OH via laser-induced fluorescence

Mosburger, Michael; Sick, Volker

doi:10.1007/s00340-010-3896-y

Cited by 15 publications

(12 citation statements)

References 31 publications

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“…The B-X/B-A scheme is found to be the most used to probe CO in flames. 4 Two-photon excitation in the fourth positive system (A 1 Π(v′ = 4-5)←←X 1 Σ + (v″ = 0)) in the range 278–284 nm and fluorescence detection through A-X(4,11–15) and A-X(5,11–15) vibrational bands was a strategy applied by Mosburger and Sick 5 for the simultaneous detection of CO and OH in a Bunsen burner flame. However, this approach requires the detection of fluorescence signal at short wavelengths (between 200 and 240 nm). Two-photon excitation at 217.5 nm of the Hopfield band (C 1 Σ + (v′ = 0)←←X 1 Σ + (v″ = 0)) with detection through the Herzberg band (C 1 Σ + (v′ = 0)→A 1 Π (v″ = 0)) in the range 400–600 nm have been demonstrated by Linow et al.…”

Section: Spectra Modeling Principlementioning

confidence: 99%

“…Two-photon excitation in the fourth positive system (A 1 Π(v′ = 4-5)←←X 1 Σ + (v″ = 0)) in the range 278–284 nm and fluorescence detection through A-X(4,11–15) and A-X(5,11–15) vibrational bands was a strategy applied by Mosburger and Sick 5 for the simultaneous detection of CO and OH in a Bunsen burner flame. However, this approach requires the detection of fluorescence signal at short wavelengths (between 200 and 240 nm).…”

Section: Spectra Modeling Principlementioning

confidence: 99%

“…Without values in the literature, we used μ = 1 in our simulations, which yields good comparison with the experimental spectra of Mosburger et al. 5…”

Section: Excitation Spectrummentioning

confidence: 99%

“…On the other hand, very high laser intensity is required for two-photon excitation of A-X transition. For example, Mosburger and Sick 5 have used a laser density equal to 13 GW·cm −2 so that Stark broadening and shift are no longer negligible. Girard et al.…”

Section: Excitation Spectrummentioning

confidence: 99%

“…While a large amount of studies have experimentally 1–5 investigated carbon monoxide fluorescence, there are only a few attempts of CO fluorescence modeling reported in the literature. 1–3,6 The simulation code developed by Seitzman et al.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of Carbon Monoxide Two-Photon Laser-Induced Fluorescence (LIF) Spectra at High Temperature and Pressure

et al. 2020

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In this study, quantitative model of two-photon excitation and fluorescence spectra of carbon monoxide based on up-to-date spectroscopic constants collected during an extensive literature survey was developed. This semi-classical model takes into account Hönl–London factors, quenching effects (collisional broadening and shift), ionization and stark effect (broadening and shift), whereas predissociation is neglected. It was specifically developed to first reproduce with a high confidence level the behavior of our experimental spectra obtained from laser-induced fluorescence (LIF) measurements, and then to allow us to extrapolate the fluorescence signal amplitude in other conditions than those used in these experiments. Synthetic two-photon excitation and fluorescence spectra of CO were calculated to predict the fluorescence signal at high pressures and temperatures, which are representative of gas turbine operating conditions. Comparison between experimental and calculated spectra is presented. Influence of temperature on both excitation and fluorescence spectra shapes and amplitudes is well reproduced by the simulated ones. It is then possible to estimate flame temperature from the comparison between experimental and calculated shapes of numerical excitation spectra. Influence of pressure on both excitation and fluorescence spectra was also investigated. Results show that for temperature below 600 K and pressure above 0.1 MPa, the usual Voigt profile is not suitable to reproduce the shape of the excitation spectrum. We found that the Lindholm profile is well suited to reproduce the pressure-dependence of the spectrum in the range 0.1 to 0.5 MPa at 300 K, and 0.1 to 0.7 MPa at 860 K. Beyond 0.7 MPa, in this temperature range, it is shown that the Lindholm profile does no longer match the spectral profiles, in particularly the red wing. Further analyses taking into account the line mixing phenomenon at higher pressure are thus discussed.

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Section: Spectra Modeling Principlementioning

confidence: 99%

Section: Spectra Modeling Principlementioning

confidence: 99%

“…Without values in the literature, we used μ = 1 in our simulations, which yields good comparison with the experimental spectra of Mosburger et al. 5…”

Section: Excitation Spectrummentioning

confidence: 99%

Section: Excitation Spectrummentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modeling of Carbon Monoxide Two-Photon Laser-Induced Fluorescence (LIF) Spectra at High Temperature and Pressure

et al. 2020

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Absolute, spatially resolved, in situ CO profiles in atmospheric laminar counter-flow diffusion flames using 2.3 μm TDLAS

et al. 2012

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We developed a new, spatially traversing, direct tunable diode laser absorption spectrometer (TDLAS) for quantitative, calibration free and spatially resolved in situ measurements of CO profiles in atmospheric, laminar, non-premixed CH 4 /air model flames stabilized at a Tsuji counter flow burner.The spectrometer employed a carefully characterized, room temperature distributed feedback diode laser to detect the R20 line of CO near 2313 nm (4324.4 cm -1 ), which allows to minimize spectral CH 4 interference and detect CO even in very fuel rich zones of the flame. The burner head was traversed through the 0.5 mm diameter laser beam in order to derive spatially resolved CO profiles in the only 60 mm wide CH 4 /air flame. Our multiple Voigt line Levenberg-Marquardt fitting algorithm and the use of highly efficient optical disturbance correction algorithms for treating transmission and background emission fluctuations as well as careful fringe interference suppression permitted to achieve a fractional optical resolution of up to 2.4x10 -4 OD (1) in the flame (T up to 1965 K). Highly accurate, spatially resolved, absolute gas temperature profiles, needed to compute mole fraction and correct for spectroscopic temperature dependencies, were determined with a spatial resolution of 65 µm using ro-vibrational N 2 -CARS (Coherent anti-Stokes Raman spectroscopy ). With this setup we achieved temperature dependent CO detection limits at the R20 line of 250 to 2000 ppmv at peak CO concentrations of up to 4 Vol.%. This permitted local CO detection with signal to noise ratios of more than 77. The CO TDLAS spectrometer was then used to determine absolute, spatially resolved in situ CO concentrations in the Tsuji flame, investigate the strain dependence of the CO Profiles and favorably compare the results to a new flame chemistry model.

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Simultaneous one-dimensional fluorescence lifetime measurements of OH and CO in premixed flames

et al. 2013

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Single laser detection of CO and OH via laser-induced fluorescence

Cited by 15 publications

References 31 publications

Modeling of Carbon Monoxide Two-Photon Laser-Induced Fluorescence (LIF) Spectra at High Temperature and Pressure

Modeling of Carbon Monoxide Two-Photon Laser-Induced Fluorescence (LIF) Spectra at High Temperature and Pressure

Absolute, spatially resolved, in situ CO profiles in atmospheric laminar counter-flow diffusion flames using 2.3 μm TDLAS

Simultaneous one-dimensional fluorescence lifetime measurements of OH and CO in premixed flames

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