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Citation: LIU Geng-Ran, HUANG Shun-Xiang, HU Fei, CHEN Hai-Ping, CAO Bao-Yu, WANG Xuan-Yu. IR Extinction Effect of Red Phosphorous Smoke Screen[J]. Chinese Journal of Applied Chemistry, ;2005, 22(7): 709-714. shu

IR Extinction Effect of Red Phosphorous Smoke Screen

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a Institution of Chemical Defense, Beijing 102205;
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b State Key Laboratory of Atmospheric Boundary Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Science, Beijing;
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c Department of Mechanics and Mechanical Engineering, University of Science and Technology of China, Hefei;
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d College of Chemical Defense, Beijing

Corresponding author: LIU Geng-Ran,
Received Date: 16 July 2004
Available Online: 6 December 2014
Fund Project: LAPC-KF-2004-18和中国科学院知识创新工程重大项目(KZCX2-204)资助 (KZCX2-204)

A medium-scale smoke chamber,a thermal image formation analyzer and a Fourier transform infrared spectrometer etc.were used to measure the camouflaging mass and extinction coefficient of red phosphorous smoke screen.When the target was covered completely,the camouflaging mass was 3.58 g/m².The extinction coefficient was 0.14 m²/g in the range of 3~5 μm or 0.078 m²/g in the range of 8~12 μm at 23℃ and relative humidity 60%.According to the Mie scattering theory,the extinction efficiency of red phosphorous smoke screen was calculated.By comparing the result of the theoretical data with the result of the experiment,it is shown that the two kinds of results are rather analogical in the wave band form 8 to 12 μm.The extinction of particle (2.5 μm) is worked out via analyzing key extinction factors,such as time,particle size and conductance.At the beginning of smoke screen is released,the extinction coefficient is increased.With the time going on,it falls down fast because of the sedimentation and cohesion of the small grains.The conductance of RP is little.The deepness of radiation is great while the reflection of radiation is small.So,the main extinction ability of RP is absorption.
- Infrared,
- smoke screen,
- extinction coefficient,
- red phosphorous,
- absorption
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