Laser induced incandescence determination of the ratio of the soot absorption functions at 532 nm and 1064 nm in the nucleation zone of a low pressure premixed sooting flame

Cléon, G.; Amodeo, Tanguy; Faccinetto, Alessandro; Desgroux, Pascale

doi:10.1007/s00340-011-4372-z

Cited by 59 publications

(28 citation statements)

References 32 publications

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“…It should be noted that the soot concentration was very low in this low-pressure flame (around 1 ppb) and there should be very low level of soot aggregation. In consequence, the results of [33] are considered more reliable than those presented in [1] with regard to the relative spectral variation of E(m), since the neglect of the term N * p exc,2 N * p exc,1 in Eq. 14 seems more justified.…”

Section: The Tew-lii Setupmentioning

confidence: 96%

“…The independence of the relative spectral variation of E(m) with HAB has been systematically established by the same group for all investigated flames at atmospheric pressure [1]. However, this was not the case when the method was applied to a low-pressure methane/oxygen/nitrogen flame (equivalence ratio 2.32) [33]. In this case, a significant decrease in the ratio E(m,532 nm)/E(m, 1064 nm) in the soot nucleation zone was observed.…”

Section: The Tew-lii Setupmentioning

confidence: 99%

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Influence of soot aggregate size and internal multiple scattering on LII signal and the absorption function variation with wavelength determined by the TEW-LII method

Yon

Therssen

Liu³

et al. 2015

Appl. Phys. B

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Section: The Tew-lii Setupmentioning

confidence: 96%

Section: The Tew-lii Setupmentioning

confidence: 99%

Influence of soot aggregate size and internal multiple scattering on LII signal and the absorption function variation with wavelength determined by the TEW-LII method

Yon

Therssen

Liu³

et al. 2015

Appl. Phys. B

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“…Several efforts have been made to investigate the absorption function E(m) of aging soot in the visible and near infrared as a function of HAB in flat premixed flames (Bladh et al 2011;Bejaoui et al 2015;Maffi et al 2011) and its wavelength dependence (L opez-Yglesias et al 2014; Simonsson et al 2015;Cl eon et al 2011;Migliorini et al 2011). These studies have shown that the soot absorption increases with increasing HAB from about 0.2 to 0.4 as soot particles evolve from young to more mature state.…”

Section: Thermal and Optical Properties Of Incipient Sootmentioning

confidence: 99%

Investigation of the size of the incandescent incipient soot particles in premixed sooting and nucleation flames of n-butane using LII, HIM, and 1 nm-SMPS

Betrancourt

Liu

Desgroux

et al. 2017

Aerosol Science and Technology

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(2017) Investigation of the size of the incandescent incipient soot particles in premixed sooting and nucleation flames of nbutane using LII, HIM, and 1 nm-SMPS, Aerosol Science and Technology, 51:8, 916-935, DOI: 10.1080/02786826.2017 Laser-induced incandescence (LII) measurements were conducted to explore the ability of LII to detect small soot particles of less than 10 nm in two sooting flat premixed flames of n-butane: a socalled nucleation flame obtained at a threshold equivalence ratio F D 1.75, in which the incipient soot particles undergo only minor soot surface growth along the flame, and a more sooting flame at F D 1.95. Size measurements were obtained by modeling the time-resolved LII signals detected using 1064 nm laser excitation. Spectrally-resolved LII signals collected in the nucleation flame display a similar blackbody-like behavior as mature soot. Soot particle temperature was determined from spectrally-resolved detection. LII modeling was conducted using parameters either relevant to those of mature soot or derived from fitting the modeled results to the experimental LII data. Particle size measurements were also carried out using (1) ex situ analysis by helium-ion microscopy (HIM) of particles sampled thermophoretically and (2) online size distribution analysis of microprobe-sampled particles using a 1 nm-SMPS. The size distributions of the incipient soot particles, found in the nucleation flame and in the early soot region of the F D 1.95 flame, derived from time-resolved LII signals are in good agreement with HIM and 1 nm-SMPS measurements and are in the range of 2-4 nm. The thermal and optical properties of incipient soot were found to be not radically different from those of mature soot commonly used in LII modeling. This explains the ability of incipient soot particles to produce continuous thermal emissions in the visible spectrum. This study demonstrates that LII is a promising in situ optical particle sizing technique that is capable of detecting incipient soot as small as about 2.5 nm and potentially 2 nm and resolving small changes in soot sizes below 10 nm.

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“…Optical properties have also been exploited more recently for evaluating soot aging, aerosol composition and the response of optical diagnostics based on laser light absorption for soot measurements [9,[17][18][19][20][21]. Strictly correlated to the optical dispersion is the optical band gap, a parameter commonly used in solid-state physics for predicting applicability and performance of solid materials in optoelectronic devices, and also used for evaluating the aromatic characteristics (size, aromatic content) of non-crystalline carbons.…”

Section: Introductionmentioning

confidence: 99%

Optical properties of organic carbon and soot produced in an inverse diffusion flame

Russo

Apicella

Lighty

et al. 2017

Carbon

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The carbonaceous matter (soot plus organic carbon) sampled downstream of an ethylene inverse diffusion flame (IDF) was chemically and spectroscopically analyzed in detail. In particular, the H/C ratio, the UV-Visible absorption coefficient and Raman parameters were measured and found to be representative of a highly disordered sp 2-rich carbon as the early soot sampled in a premixed flame. In contrast, the optical band gap was found to be relatively low (0.7eV), closer to the optical band gap of graphite than to that of medium-sized polycyclic aromatic hydrocarbons (>2eV) which are widely considered to be soot precursors and are mostly contained in the organic carbon. The significance of the optical band gap as signature of different structural levels (nano-, micro-and macro-structure) of sp 2-rich aromatic disordered carbons was critically analyzed in reference to their molecular weight/size distribution. The relevance of the optical band analysis to the study of the soot formation mechanism was also highlighted.

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Laser induced incandescence determination of the ratio of the soot absorption functions at 532 nm and 1064 nm in the nucleation zone of a low pressure premixed sooting flame

Cited by 59 publications

References 32 publications

Influence of soot aggregate size and internal multiple scattering on LII signal and the absorption function variation with wavelength determined by the TEW-LII method

Influence of soot aggregate size and internal multiple scattering on LII signal and the absorption function variation with wavelength determined by the TEW-LII method

Investigation of the size of the incandescent incipient soot particles in premixed sooting and nucleation flames of n-butane using LII, HIM, and 1 nm-SMPS

Optical properties of organic carbon and soot produced in an inverse diffusion flame

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