Detector calibration and measurement issues in multi-color time-resolved laser-induced incandescence

Mansmann, Raphael; Sipkens, Timothy A.; Menser, Jan; Daun, Kyle J.; Dreier, Thomas; Schulz, Christof

doi:10.1007/s00340-019-7235-7

Cited by 12 publications

(5 citation statements)

References 67 publications

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“…Since the proper interpretation of the LII signal is not straightforward, attempts are made to standardize calibration and signal processing protocols. 107,108 When the laser uence is high enough to vaporize the NPs, the emitted atomic spectrum can also be used to gain information on the particles. This is the basis of laser-induced breakdown spectroscopy (LIBS), a technique well-known in analytical spectrochemistry 109 (see Section 3.3.3. for details).…”

Section: Methodology and Applicationsmentioning

confidence: 99%

Nanoparticles in analytical laser and plasma spectroscopy – a review of recent developments in methodology and applications

Galbács

Kéri

Kohut

et al. 2021

J. Anal. At. Spectrom.

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Section: Methodology and Applicationsmentioning

confidence: 99%

Nanoparticles in analytical laser and plasma spectroscopy – a review of recent developments in methodology and applications

Galbács

Kéri

Kohut

et al. 2021

J. Anal. At. Spectrom.

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“…Signals were normalized to the 747 nm band using a tungsten-halogen light source (Thorlabs, SLS202L), with known emission spectra at 2800 K, following a calibration procedure similar to the one described in Ref. [36].…”

Section: Excitation and Detection Systemsmentioning

confidence: 99%

Time-resolved laser-induced incandescence on metal nanoparticles: effect of nanoparticle aggregation and sintering

2023

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This work examines the excessive absorption and anomalous cooling phenomena reported in laserinduced incandescence measurements on metal nanoparticles by considering the effects of aggregate structure and sintering. Experimental investigations are conducted on iron and molybdenum aerosols, which have different melting points and thus respond differently to the laser pulse. Although aggregation enhances the absorption cross-section of the nanoparticles and allows for higher peak temperatures, this enhancement does not fully explain the observed excessive absorption. Furthermore, as the aggregates of refractory metals such as molybdenum cool, they may sinter through gradual grain boundary diffusion; this change in structure alters their absorption cross-section, manifesting as a rapid drop in the pyrometric temperature, which could explain the anomalous cooling reported for this metal.

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“…Prospecting for turbulent measurements and the need of high-speed detection equipment, the latter method is preferred in this work, reducing the experimental expenditure by a factor of two. While the accuracy is somewhat reduced (due to optical and heat transfer parameters remaining in the simulation of the signal curve) [24], the single-color approach is well suited to describe how soot size evolves within a flame. The heat transfer model used to determine the primary particle size is described in detail in previous work [7].…”

Section: Modelmentioning

confidence: 99%

Three-dimensional particle size determination in a laminar diffusion flame by tomographic laser-induced incandescence

Bauer

Cai

et al. 2020

Appl. Phys. B

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Non-intrusive measurement techniques are required to gain a comprehensive understanding about the processes of soot formation, growth and oxidation. Time-resolved laser-induced incandescence (TiRe-LII), commonly performed 0D or 2D within a flame, has proven to be a very suitable tool for the in situ sizing of soot primary particles. In this work, the technique is expanded to the third dimension by employing volumetric illumination and coupling it with a tomographic approach, which allows to computationally gain 3D information from 2D images taken at various angles. To minimize experimental cost, an approach using nine fiber bundles arranged in a semicircle around the flame and imaging the light onto a single camera is used. The technique is demonstrated on an ethene diffusion flame on a standard burner, providing spatially resolved 3D particle sizes. One focus of this work is to reveal the influence of input parameters such as the local bath gas temperature, which we measured by two-color pyrometry, and local laser fluence, which are both required for an accurate evaluation of the local particle size. It is shown that the assumption of an average temperature may result in a wrong picture even of qualitative soot size evaluation. In the end, a concept is proposed for a simultaneous determination of the 3D distribution of particle sizes through TiRe-LII and the required bath gas temperature via two-color pyrometry using a tomographic approach with only three cameras.

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Detector calibration and measurement issues in multi-color time-resolved laser-induced incandescence

Cited by 12 publications

References 67 publications

Nanoparticles in analytical laser and plasma spectroscopy – a review of recent developments in methodology and applications

Nanoparticles in analytical laser and plasma spectroscopy – a review of recent developments in methodology and applications

Time-resolved laser-induced incandescence on metal nanoparticles: effect of nanoparticle aggregation and sintering

Three-dimensional particle size determination in a laminar diffusion flame by tomographic laser-induced incandescence

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