Femtosecond laser induced breakdown for combustion diagnostics

Kotzagianni, Maria; Couris, Stelios

doi:10.1063/1.4731781

Cited by 42 publications

(15 citation statements)

References 27 publications

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“…The measuring principle of LIBS is based on monitoring the emission from the plasma created by focusing a powerful laser beam in the flame region [1,2]. In contrast to much of previous work where LIBS has been applied to the reactants region of laminar premixed flames for demonstration and calibration [3][4][5][6][7][8][9][10][11], here we focus on its use in fully turbulent premixed and nonpremixed flames. The need to measure in turbulent combustion systems dictates that attention should be placed on ensuring plasma creation in both the low-and high-temperature regions, on the precision of single-shot results, and on calibration strategies spanning a wider range of mixtures than before.…”

Section: Introductionmentioning

confidence: 99%

Laser-induced breakdown spectroscopy measurements in turbulent methane flames

Kotzagianni

Yuan

Mastorakos

et al. 2014

52nd Aerospace Sciences Meeting

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Laser Induced Breakdown Spectroscopy (LIBS) in uniform flowing methane-air mixtures of compositions ranging from only air to only fuel was investigated in order to explore calibration schemes for further measurements in turbulent non-premixed and premixed flames. A portable low-cost spectrometer was used to record plasma emission spectra. The differences among the various spectra are discussed and the intensity ratios H α (656.3nm)/O(777.3nm) and C 2 (516.5nm)/CN(388.3nm) were found to depend monotonically to the mole fraction of methane in the ranges 0-0.3 and of 0.3-1.0 respectively, therefore providing a scheme for measurement in non-premixed systems spanning a wide range of equivalence ratios. Based on this and using laser excitation conditions such that the escaping plasma emission contains spectral signatures from reactants, flame intermediates, and combustion products, the measurement can be thought to give an estimate of the local and instantaneous mixture fraction. The mean estimated mixture fraction in turbulent axisymmetric non-reacting and reacting jets was in reasonable agreement with empirical correlations. The technique was also applied to a swirling recirculating premixed flame and it is shown that the equivalence ratio is successfully measured.

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Section: Introductionmentioning

confidence: 99%

Laser-induced breakdown spectroscopy measurements in turbulent methane flames

Kotzagianni

Yuan

Mastorakos

et al. 2014

52nd Aerospace Sciences Meeting

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“…For the first time, Kotzagianni et al [90,93] performed fs-LIBS technique in a premixed CH 4 /air flame. They used the spectral intensity of CN at 388 nm to calibrate equivalence ratio, as shown in Figure 3, and in situ equivalent ratio measurements were realized.…”

Section: Femtosecond Laser-induced Breakdown Spectroscopy (Fs-libs)mentioning

confidence: 99%

“…Therefore, the spectrum of fs-LIBS is dominated by atomic emissions, which might miss some crucial information related to molecules. Furthermore, fs-LIBS has continuum background interference [90,93], which may disturb the measurements. If using a spherical lens with long focal length, this issue will be reduced.…”

Section: Femtosecond Laser-induced Breakdown Spectroscopy (Fs-libs)mentioning

confidence: 99%

A Review of Femtosecond Laser-Induced Emission Techniques for Combustion and Flow Field Diagnostics

Zhang

Liu

et al. 2019

Applied Sciences

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The applications of femtosecond lasers to the diagnostics of combustion and flow field have recently attracted increasing interest. Many novel spectroscopic methods have been developed in obtaining non-intrusive measurements of temperature, velocity, and species concentrations with unprecedented possibilities. In this paper, several applications of femtosecond-laser-based incoherent techniques in the field of combustion diagnostics were reviewed, including two-photon femtosecond laser-induced fluorescence (fs-TPLIF), femtosecond laser-induced breakdown spectroscopy (fs-LIBS), filament-induced nonlinear spectroscopy (FINS), femtosecond laser-induced plasma spectroscopy (FLIPS), femtosecond laser electronic excitation tagging velocimetry (FLEET), femtosecond laser-induced cyano chemiluminescence (FLICC), and filamentary anemometry using femtosecond laser-extended electric discharge (FALED). Furthermore, prospects of the femtosecond-laser-based combustion diagnostic techniques in the future were analyzed and discussed to provide a reference for the relevant researchers.

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“…This results from the unique properties of femtosecond laser pulses; those properties being broadband, ultrafast, and high intensity. Only a few studies on combustion analysis using femtosecond laser pulses have been reported [7][8][9][10]. In this Letter, we experimentally demonstrate the feasibility of simultaneous detection and identification of multiple intermediate species in a flame using filament-induced nonlinear spectroscopy (FINS) [11].…”

mentioning

confidence: 99%

Sensing combustion intermediates by femtosecond filament excitation

Yang

et al. 2013

Opt. Lett.

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Simultaneous monitoring of multiple combustion intermediates using femtosecond filament-induced nonlinear spectroscopy is demonstrated. Clean fluorescence emissions from free radicals CH, CN, NH, OH, and C(2), as well as atomic C and H, are observed when a femtosecond filament is formed in the laminar ethanol/air flame on an alcohol burner. The fluorescence signals of these species are found to vary as functions of the position of interaction of the filament with the flame along the vertical axis of the central combusting flow, opening up a possibility for remote combustion diagnostic in engines by the excitation of femtosecond laser filament.

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Femtosecond laser induced breakdown for combustion diagnostics

Cited by 42 publications

References 27 publications

Laser-induced breakdown spectroscopy measurements in turbulent methane flames

Laser-induced breakdown spectroscopy measurements in turbulent methane flames

A Review of Femtosecond Laser-Induced Emission Techniques for Combustion and Flow Field Diagnostics

Sensing combustion intermediates by femtosecond filament excitation

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