Laser-induced incandescence: excitation and detection conditions,material transformations and calibration |
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Authors: | R?L?Vander?Wal |
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Institution: | (1) Department of Energy and Mineral Engineering, The Energy Institute & The Penn State Institutes of Energy and the Environment, Penn State University, 203 Hosler Building, University Park, PA 16802, USA |
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Abstract: | Successful implementation of laser-induced incandescence (LII) relies upon judicious choice of excitation and detection conditions.
Excitation conditions encompass choice of excitation wavelength and laser fluence. Detection conditions include choice of
detection wavelength, spectral band pass about the central wavelength, detection delay and duration relative to the excitation
laser pulse usually corresponding to the peak of the signal intensity. Examples of applying these parameters to LII are illustrated
by way of examples: soot/polycyclic aromatic hydrocarbon and metal aerosol systems. Tradeoffs must be recognized. Laser-induced
chemical and structural changes of the aerosol must be considered, particularly in light of heterogeneous aerosols. Diagnostics
of such changes are outlined as they will affect interpretation of the LII signal. Finally, calibration (for LII) must be
chosen to be appropriate for aerosols from practical sources as they may be mixed organic and inorganic composition.
A research paper in response to the call for papers from the Third International Discussion Meeting and Workshop on Laser-Induced
Incandescence July 30th–August 1st, Ottawa, Canada (2008). |
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Keywords: | PACS" target="_blank">PACS 78 47 Cd 85 60 Gz 42 62 Fi 44 40 +a 65 80 +n |
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