Laser-induced incandescence: Development and characterization towards a measurement of soot-volume fraction |
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Authors: | Vander Wal R L Weiland K J |
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Institution: | (1) NASA Lewis Research Center, 21000 Brookpark Road, Mail stop 110-3, 44135 Cleveland, OH, USA |
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Abstract: | Laser-Induced Incandescence (LII) occurs when a high-energy pulsed laser is used to heat soot to incandescent temperatures. Theoretical calculations predict and experimental tests demonstrate the resulting incandescence to be a measure of soot-volume fraction. Practical implementation of the technique is detailed by examining the spectral character, temporal behavior, and excitation-intensity dependence of the resulting thermal emission from the laser-heated soot in both premixed and diffusion flames. Spatial and temporal capabilities of LII are demonstrated by obtaining one- and two-dimensional images of soot-volume fraction via laser-induced incandescence in both types of flames. |
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Keywords: | 42 62 Hk 78 20 Dj 82 40 Py |
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