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Proceedings Paper

Stair phenomenon study in spectrum infrared transmission of water spray
Author(s): Zhong-wei Chen; Li Zhang; Chao Liang; Hong-bin Wang; Ling-jiang Zhang
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Paper Abstract

The calculation and theoretical analysis of water spray infrared attenuation have been partially solved, where multi-scattering, distribution of droplet diameter, droplet density and water optical character in the infrared atmosphere window, etc. are considered. However, under the premise that droplet density does not change, is there a stair phenomenon in water spray monochromatic infrared transmission? If yes, what are the reasons? These questions are still to be answered. In the calculation, with the unchanged general droplet density, through changing the droplet size of water spray, the corresponding water spray spectrum 3~12μm infrared transmission is calculated with MIE scatter theory and Single Diameter Monte Carlo Method. The results show that there are two conditions for the occurrence of infrared transmission stair phenomenon of water spray: 1) with the increase of droplet diameter, the droplet extinction index decreasing speed is consistent with the square speed of droplet diameter increase; 2) the corresponding infrared albedo change small. Meanwhile, results also show that when the infrared wave length is less than 3.3μm or more than 5.7μm, there is no stair-like phenomenon in water spray transmission curve. While between 3.3 and 5.7μm, the spectrum infrared transmission stair phenomenon will occur in certain droplet diameter range.

Paper Details

Date Published: 11 September 2013
PDF: 9 pages
Proc. SPIE 8907, International Symposium on Photoelectronic Detection and Imaging 2013: Infrared Imaging and Applications, 89070V (11 September 2013); doi: 10.1117/12.2031725
Show Author Affiliations
Zhong-wei Chen, Naval Academy of Armament (China)
Li Zhang, Naval Academy of Armament (China)
Chao Liang, Naval Academy of Armament (China)
Hong-bin Wang, Naval Academy of Armament (China)
Ling-jiang Zhang, Naval Academy of Armament (China)


Published in SPIE Proceedings Vol. 8907:
International Symposium on Photoelectronic Detection and Imaging 2013: Infrared Imaging and Applications
Haimei Gong; Zelin Shi; Qian Chen; Jin Lu, Editor(s)

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