Dissertation > Environmental science, safety science > Environmental pollution and its prevention > Atmospheric pollution and its control

Theory and Experimental Study on the Smoke Total Obscuring Power

Author WangYingLi
Tutor DaiJingMin
School Harbin Institute of Technology
Course Instrument Science and Technology
Keywords Full shielding capability The smokescreen effective shadow area Irradiance measurements Particle size distribution Mie scattering theory
Type PhD thesis
Year 2008
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The subject comes from Qiqihar Jianhua Machinery Research Institute, and the National Natural Science Foundation of China (ID: 50336010), part of the purpose is to study the ability of the smokescreen future obscured and effective shelter area, and the development of the full shielding capability detection system, in order for Smoke Screen goals effectively identify, simulation technology for electronic interference, theoretical models and experimental platform. The smokescreen interference is the most widely used, a photoelectric the passive interference manner, by casting a large number of aerosol particles in the air to change the atmospheric transmission characteristics of the optical radiation so as to cover up the target to be protected. Because the smokescreen of extinction Mechanism is the foundation of the smokescreen technology development, the development of the Western countries (especially the United States) smokescreen equipment attaches great importance to basic theoretical research. Domestic modern the smokescreen technology research started late smokescreen technology research work is mainly built on the basis of a large number of experiments explore smokescreen mechanism of extinction is still relatively small. State of backwardness, lack of basic research, the theoretical study of China's smokescreen smokescreen for the choice of materials is a lack of theoretical guidelines, the formulations often rely on experimentation and experience to determine which to some extent limit the development of a smoke-screen technology in China. Smoke Agent shielding capability value TOP (Total Obscuring Power), domestic and foreign the smokescreen technology field characterization smoke agent to generate a smokescreen on the characteristic parameters of the human visual masking ability. But the factors affecting the smokescreen shielding ability is very complex, test environment humidity, temperature, time, and smokescreen settlement factors will affect the measurement results of the TOP. Thesis mainly focus on the measurement and evaluation of the Smoke Screen ability, combined with a smokescreen of the visible full obscured the ability to detect system developed, the system shielding capability measurement principle, measurement methods, light scattering theory, measurement model and measurement uncertainty the content depth study, mainly to the completion of the following aspects of the research work: 1 Smoke Screen Characteristics. A detailed analysis of the smokescreen shielding effect on the human eye, LLL imaging systems, passive infrared imaging systems, and imaging guidance system, and smokescreen transmittance model, the model of the absorption coefficient, shielding capability model are analyzed and compared. 2. Smokescreen wholly obscured the ability to detect system design. Smokescreen shielding capability detection system based on the the irradiance measurement method developed by the human visual contrast threshold value basis. Phosphorus smoke TOP was detected at a temperature of 26 ° C and a relative humidity of 60% under the conditions, the obtained test results and experience values ??compared to less than 4% error. The case of different particle size distribution, the smokescreen visible light measurements analysis of full shielding capability. Different smokescreen component, the relative temperature, humidity, and smokescreen forming time, status, and other factors will affect the particle size of the smokescreen distribution, thereby affecting the effective light-absorbing area of ??the smoke particles and the effective scattering area. For different particle size distribution model and calculation results, the use of Mie theory to model the proposed TOP of different particle size distribution of the response function, thus improving the reliability of the the targeted detection system and measuring results. 4 on the extension of the 1-3μm ,3-5μm ,8-14μm three infrared bands and 10.6μm laser TOP mathematical model application and parameter detection. Taking into account with the technical development of the anti-infrared smoke, many researchers actively explore the ability of infrared radiation penetrating smokescreen status, as well as limitations of the present measurement system wholly shielding ability of visible light detection system smokescreen infrared band expansion and test research. 5 effective smokescreen image area edge detection algorithm. Calculated by analyzing the characteristics of the target and background radiation, infrared image signal-to-noise ratio; morphology ecology smokescreen effective shelter area calculation and simulation. This thesis provides a theoretical basis for the the analysis the smokescreen formula as well as the development of efficient energy Smoke Interfering Material can advance further improve the accuracy of theoretical models and improve system based on unified characterization Smoke Screen ability to work, and then to develop starting smoking agent obscured the ability of the test standard.

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