Composition Design And Application Research On Pyrotechnic Anti-infrared Smoke Agent

Infrared screening smokes become more important as countermeasures against to the modern infrared sensors with the gradually perfected opto-electronic technology. An effective method of meeting the need of the modern battlefield by smoke systems is pyrotechnic anti-infrared smoke agent.In this dissertation, theory bases, technical project and approach of pyrotechnic anti-infrared smoke agent are expounded. The composition design project of pyrotechnic anti-infrared smoke agent is put forward, which the main components of smoke are carbon black. The paper is directed at understanding how the amounts of soot formation and extinction performance alter the combustion temperature, pressure and material molecule structure, and the mechanism figure of soot formation is developed and illustrated. The extinction model of poly-disperse soot aggregates is developed, based on RDG/FA theory, and a computer program is designed to calculate the extinction coefficient of soot. Compared with known results, this method is proved accurate and effective. Optimal smoke composition, which is designed by uniform design method, is obtained through smoke facility experiments. The relationship of anti-infrared smoke performance and smoke agent materials is analyzed by using the second regression model. The testing mechanism of IR spectrum transmittance is studied and the testing method of IR spectrum transmittance is established. The experiment results of infrared spectrum transmittance, mass concentration, smoke size distribution and deposition velocity indicate that our studied infrared smoke agent can form high efficiency smokescreen. The theory and experiment research on the smoke interference mechanism to the IR imaging are studied. The laboratory and field results indicate that the forming smoke of our studied smoke agent can effectively interfere IR imaging. Because the measurement of anti-infrared smoke screening performance that is an important factor of smoke agent is deeply affected by weather and environment, measurement is always a difficult problem in field. Anti-infrared smoke screening model is developed based on theory of radiation transmit process and atmospheric diffusion. Some of results are confirmed by experiment, the experiment results are according with calculated results.