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Proceedings Paper

Extinction performance of superfine graphite smoke to 10.6 μm laser emission
Author(s): Xuanyu Wang; Gongpei Pan
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Paper Abstract

The mass extinction coefficient of superfine graphite smoke to 10.6μm laser emission produced by CO2 gas laser and the granularity distribution of the smoke particles at different time have been tested in a middle-size smoke chamber. The absorption, scattering and extinction efficiency factors of graphite smoke with different diameters to 10.6μm laser emission have been calculated according to Mie scattering theory and the curves of extinction factors varied with wavelength or particle diameter have been drawn too. Experimental results have shown that the superfine graphite smoke has a good extinction performance to 10.6μm laser emission and that the average mass extinction coefficient of the smoke to 10.6μm laser emission is 1.214m2/g. By the analysis, the optimal scattering diameter of graphite smoke to 10.6μm laser emission is 9μm while the optimal absorption diameter is 2.0μm and the optimal extinction diameter is 3.0μm. If the scattering diameter of the graphite smoke is smaller than the wavelength of incident laser emission, the extinction effect is dependent on the absorption. The scattering function increases with the enlargement of smoke particle diameter. In addition, the superfine graphite is difficult to effectively diffuse and form a thick concentration in air. The average diameter of graphite smoke particles gradually decreases with the time increment after forming the smoke.

Paper Details

Date Published: 23 February 2006
PDF: 6 pages
Proc. SPIE 6150, 2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 61502R (23 February 2006); doi: 10.1117/12.676945
Show Author Affiliations
Xuanyu Wang, Institute of Chemical Defense (China)
Nanjing Univ. of Science and Technology (China)
Gongpei Pan, Nanjing Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 6150:
2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment
Xun Hou; Jiahu Yuan; James C. Wyant; Hexin Wang; Sen Han, Editor(s)

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