The Research Of Infrared Radiation And Transfer Of High Temperature Gases Of CO₂ And H₂O

Infrared radiation model of aircraft plume is established based on back monte-carlo method,and infrared radiation spectrum of high temperature gas of combustion products H2O and CO2 is calculated.The process of target radiation transmission to the top of atmosphere is simulated,and the influence of different conditions of atmosphere on the exhaust plume radiation transfer is analyzed.In this paper,the main work is as follows:1.Physics model of exhaust plume is established,then internal field parameters of each region are simulated,the radiation parameters of each small area are computated based on HITRAN database.At last,infrared radiation spectrum of exhaust plume is get using back monte-carlo method.Different temperatures of coe are computated and the results are compared.2.The sky background radiation and atmospheric oblique transmittance are calculated using Commal Atmospheric Radiative Transfer(CART)software.Then using the results of CART radiation characteristic of exhaust plume and target background contrast are calculated.The influences of three factors about the altitude,atmospheric model and observation zenith angle are analysed and the best observation band of satellite is get.3.Based on optimal interpolation method this paper use ground sounding monthly data to correct MODIS atmospheric profiles.In the area where have sites,the results of the corrected profiles were compared with real-time detection of the day and the average error and root mean square error were decreased by more than 10%.In the area where do not have sites,we use the data of weighted average of several sites around the target area to correct the MODIS data,and compared the results with real-time balloons data of the day.The effect is also significant.4.The reflectance of atmosphere on the condition of cirrus is computed by using Combined Atmospheric Radiative Transfer(CART)software on the band of strong absorption.The effects of cirrus particle's shape and effective size,optical depth and altitude of cirrus on atmospheric reflectance and background radiation are analyzed.A radiation model of high-temperature gas is established and the spectral radiation properties of target at the top of atmosphere(TOA)are simulated.On this basis,target-background contrast at TOA is computed,and the effects of cirrus properties parameter and target altitude are discussed.5.Considering 3-D atmosphere transfer model,the influence of cloud parameter on the radiation in the top of atmosphere is calculated.Target radiation and 3-D atmosphere transfer model are coupled,and radiation in the top of atmosphere is calculated.The infrared model of exhaust plume is established and the influence of atmosphere on infrared radiation transfer is computed.The results can be used in the field of aircraft target detection,recognition and tracking.