Stair phenomenon study in spectrum infrared transmission of water spray

Zhong-wei Chen; Li Zhang; Chao Liang; Hong-bin Wang; Ling-jiang Zhang

doi:10.1117/12.2031725

11 September 2013 Stair phenomenon study in spectrum infrared transmission of water spray

Zhong-wei Chen, Li Zhang, Chao Liang, Hong-bin Wang, Ling-jiang Zhang

Proceedings Volume 8907, International Symposium on Photoelectronic Detection and Imaging 2013: Infrared Imaging and Applications; 89070V (2013) https://doi.org/10.1117/12.2031725
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

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.

Citation Download Citation

Zhong-wei Chen, Li Zhang, Chao Liang, Hong-bin Wang, and Ling-jiang Zhang "Stair phenomenon study in spectrum infrared transmission of water spray", Proc. SPIE 8907, International Symposium on Photoelectronic Detection and Imaging 2013: Infrared Imaging and Applications, 89070V (11 September 2013); https://doi.org/10.1117/12.2031725

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