A Study On The Calculation Softwar For Radiation Properties Of High Temperature And High Speed Flow Field

The radiation properties of high temperature and high speed flow field is a important content of the research on target and environment characters,which is significant for selecting a optimal detection band. Base on the calculation method of line-by-line and Mie theory ,the gas and particle radiation properties of high temperature and high speed flow field is calculated,and base on the six-flux model the spectral radiative intensity of the missile plume is obtained Besides,the radiative intensity of the evironment is calculated by Lowtran7.Through the analyzing of the characters of the target and the evironment , the Signal-to-Noise-Ration's are presented. The work mainly focuses on as follows:1. Research on Calculation of gas and particle radiation properties. Establish the the calculation model of gas ultraviolet ,visible and infrared radiation properties,and based on Mie theory, particle radiation properties calculation model is obtained.2. Development calculation program of the radiation properties. Use the method of hybrid programming between Delphi and Fortran, develop the gas and particle radiation properties calculation program, and the accuracy of calculation is cofirmed.3. Calculation of the missile plume and the background spectral radiative intensity. The spectral radiative intensity of missile plume and is simulated with six-flux model, and the spectral radiative intensity of background is analysed in Lowtran7.4. Analyse of the atmospheric attenuation of the target signals. The atmospheric transmission is simulated using Lowtran7. Based on the analysis result, the variation law of the Signal-to-Noise-Ration's are presented, which is between different distance of atmospheric attenuation and spectral point.