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Laser Induced Incandescence under High Vacuum Conditions
| Publication Type | | Journal Article |
| Year of Publication | | 2006 |
| Authors | | Beyer, V.; Greenhalgh, D.A. |
| Journal Title | | Applied Physics B: Lasers and Optics |
| Volume | | 83 |
| Issue | | 3 |
| Pages | | 455 - 467 |
| Journal Date | | 06/2006 |
| Abstract | | This paper reports on a study of laser-induced incandescence of carbon particles in free space within a high vacuum (<10-3 mbar) excited by an Nd:YAG laser pulse. We have conducted an experimental study using samples of carbon black placed within an evacuated, sealed glass vessel which is slowly tumbled to cause a cascade of carbon black particles in free space. Our experiments show that under a high vacuum two important phenomena are observed. Due to the absence of gaseous conduction, in comparison to particles in ambient air, incandescence lifetime in a vacuum is dramatically extended to more than 50 μs with a corresponding increase of a factor of over 104 in the integrated or total number of photons emitted by each soot primary particle. For large aggregates and/or agglomerates in a vacuum after a delay of the order of 2 to 10 μs, the large particles fragment into smaller entities. We have also modelled the incandescence behaviour using well established methods. |
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