Research On Radiation Signatures And Size Distribution Of Particles Under High-Temperature

This paper is a part of project about infrared radiation characteristics and the transmission analysis of the multiple dimensions and multiple parameters, supported by the key project of the National Natural Science Foundation of China (No. 50336010). Particle is regarded as the fourth state of matter. It has the characters of high specific surface area and polydispersity, these two major characteristics different from solid, liquid and gas. Many materials in the fields of chemical, metallurgical, power, construction, medicine, biology, food, aerospace, military and atmospheric sciences, and other fields, are in state of particle. According to statistics, more than 50% of industrial products or intermediate products are in state of particle. Heating, cooling and drying these products, or measuring these products online using visible, infrared, optical equipments all need the radiation characteristics of particles, and also need representing of particles. In the study of radiation characteristics of particles, computing the particulate optical constants (the complex index of refraction) is a basic issue and occupies a key position. But many researches on radiation characteristics of particles usually limited to normal temperature, assumed that the parameters of spectral characteristics independent on the temperature, directly used the parameters of normal temperature spectral characteristics. However, recent literatures show that once the temperature changes largely, it has a great influence on particles spectral characteristics.On the basis of the measurements of particle radiation using the high-temperature particles radiation equipment, studying and analyzing the principle of testing, the structure of the experimentation equipment and the data measured, this paper improved the high-temperature particles experiment platform and made the measurements of high-temperature particle spectral characteristics more credible. At the same time, it studied the genetic algorithm for solving the inverse problem in particle size distribution.The improvements of the experimental testing bed include:â‘´Improvements in suspension system, using the nitrogen as suspending medium, adding a preheat device for the gas suspending medium, which reduced the...