| The investigation on the radiative property of plasma is of great significance onthe field such as aerospace technology, inertial confinement fusion, target detectionand recognition, spectral diagnostics and laser physics. The research is launched bysetting up models and databases of radiative property parameters and studying theproblem of radiative transfer on the plasma flow field containing the target, with thebackground of researching on the influence of plasma on the radiative property offlow field created during the reentry progress of hypersonic vehicles.First, the paper tried to use the ab initio method to calculate the NLTE plasmaradiative property, with the relativistic program FAC(Flexible atomic code) gettingthe atom dynamic parameter. Then the impact radiative model is established tocalculate the distribution of number density on detailed level accounting. Next, weget the infrared radiative property of plasma, including absorption and emissioncoefficients. Finally the influence by different plasma density and electrontemperature is analyzed.Second, The paper modified the calculation arithmetic of line-of-sight(LOS)radiative transport method. The arithmetic counted every face mesh that contributedto the light with the clipping algorithm on the overlapping grid. Meanwhile, the codewas able to eliminate the error caused by the hidden mesh which can not be seenfrom the detection. The modified LOS code is used to get the infrared detectiveimaging by calculating the transportation progress considering the flow field ofhypersonic blunted cone.The result of the research showed that it is possible to simulate the radiativeproperty spectral through the FAC program and the method is widely adapted toplasmas of many elements. However, the accuracy can not be guaranteed because ofthe atomic data calculated by FAC. The modified LOS method is used to calculatethe radiative transportation progress on the plasma flow field containing the target,and the output infrared image is reasonable. |
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