Influence of spatial laser energy distribution on evaluated soot particle sizes using two-colour laser-induced incandescence in a flat premixed ethylene/air flame

Bladh, Henrik; Johnsson, Jonathan; Bengtsson, Per-Erik

doi:10.1007/s00340-009-3523-y

Cited by 44 publications

(30 citation statements)

References 41 publications

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“…Temperatures inferred from two-color LII measurements (assuming the optical properties of graphite) indicate that these particles reach the sublimation temperature of mature soot of ~4000 K [188]. Particle sizes inferred from these measurements may be underestimated, however, if they are derived assuming the thermal accommodation coefficient for mature soot [99,187,190]. Nevertheless, these results may indicate a type of particle that appears at the size of an incipient-soot particle but has the properties of a graphitized or partially graphitized soot particle.…”

Section: Laser-induced Incandescencementioning

confidence: 99%

Understanding the ignition mechanism of high-pressure spray flames

Dahms

Paczko

Skeen

et al. 2017

Proceedings of the Combustion Institute

127

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Soot is responsible for notoriously detrimental effects on human health, air quality, and global and regional climate. Controlling soot emissions to the atmosphere will require overcoming large gaps in the understanding of soot formation and physical and chemical evolution during combustion. These gaps in understanding are largely attributable to the complexity of the chemical and physical system combined with a paucity of diagnostic techniques available for probing soot non-invasively and under a wide range of combustion conditions. This review briefly summarizes the chemistry of soot formation and evolution during combustion and describes diagnostic tools that are available to make these measurements. Despite the availability and value of a host of ex situ particle diagnostic techniques, because of space limitations, this review is restricted to a discussion of in situ diagnostic methods. The review concludes with a brief discussion of needs for new diagnostic tools to probe soot chemistry.

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Section: Laser-induced Incandescencementioning

confidence: 99%

Understanding the ignition mechanism of high-pressure spray flames

Dahms

Paczko

Skeen

et al. 2017

Proceedings of the Combustion Institute

127

View full text Add to dashboard Cite

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“…A larger value of α T leads to a more efficient loss of energy to the surrounding atmosphere and, hence, a faster signal decay at the same collision rate [1,31]. α T is a dimensionless coefficient and depends on temperature [32] as well as on soot maturity [33][34][35]. Therefore, it cannot be directly measured in real systems and it can spatially vary, e.g., in engine-like conditions.…”

Section: Sensitivity To Boundary Conditionsmentioning

confidence: 96%

Sensitivity analysis for soot particle size imaging with laser-induced incandescence at high pressure

et al. 2015

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“…[2][3][4] The PMT provides opto-electrical conversion combined with internal electrical amplification, see Figure 1, making it suitable for low light level measurements. They are temporally resolved detectors; depending on circuitry they can resolve, in real time, the impingement of single photons on the detector, or measure continuous streams of photons.…”

Section: Introductionmentioning

confidence: 99%

Investigation and compensation of the nonlinear response in photomultiplier tubes for quantitative single-shot measurements

Knappe

Lindén

Nada

et al. 2012

Review of Scientific Instruments

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General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal A concept for time-sensitive optical detectors is described that shows how to confirm whether the detection device is operating in the linear response regime. By evaluating the recorded time decay of a thermographic phosphor, even weak saturation effects far from obvious situations can be identified and further related to either optical or electrical saturation. The concept has been validated by running a PMT detector close to saturation and exposing it to the optical signal decay of two different thermographic phosphors, La 2 O 2 S:Eu and CdWO 4 . It was confirmed that short but intense light exposures at the beginning of an individual time decay influence the detector response for the rest of the decaying signal including temporal areas, where the anode current has dropped well below the manufacturer specified current limit. Such situations are common when applying, e.g., phosphor thermometry where it is necessary to retrieve the full decay curve from a single-shot event, i.e., standard techniques based on single-photon counting are omitted. Finally, means of compensation are introduced in order to facilitate the retrieval of useful information from the measurement data when operation in the non-linear response regime is inevitable.

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Influence of spatial laser energy distribution on evaluated soot particle sizes using two-colour laser-induced incandescence in a flat premixed ethylene/air flame

Cited by 44 publications

References 41 publications

Understanding the ignition mechanism of high-pressure spray flames

Understanding the ignition mechanism of high-pressure spray flames

Sensitivity analysis for soot particle size imaging with laser-induced incandescence at high pressure

Investigation and compensation of the nonlinear response in photomultiplier tubes for quantitative single-shot measurements

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