Hypersonic body moving in the atmosphere will suffer high temperature reacting flows which will emit complex radiation. Theoretical calculation was taken in this paper for a hypersonic non-ablative sphere. Hypersonic flow around the sphere was simulated using 9 species chemical kinetic and two temperature thermal non-equilibrium model. Based on this simulated flow field, the LOS method is used to solve radiative transfer and line-by-line model is used to calculate the spectrum from molecular and atoms in mid-infrared. The spectra from different components have been analyzed one by one. The calculation founds out that atom N and O diatomic molecule NO and bremsstrahlung will be important radiation source in this pure air hypersonic flow field. The radiation from hypersonic flow field has been analyzed in both high pressure environment and low pressure environment.
The spectra have been calculated with Line by Line method for high-temperature CO2 and atmosphere. The characteristic of the wing of atmospheric 4.3μm absorption band has been analyzed. The variation of transmittance from different altitudes to space in 2370 to 2390cm-1 was calculated and analyzed. The radiations of high-temperature CO2 located in different altitudes in the same wave range were compared. According to the variation of atmosphere and the spectral characteristic of hot CO2, the way for choosing band of detection was discussed.
This article studies the near sea surface atmosphere visibility and aerosol scattering asymmetry factor with observed weather data. Based on muti-modal log normal distribution model, Mie theory and SCE-UA method, near sea surface atmosphere aerosol parameters, such as distribution parameters and relative refractive index, are inversed. A discussion about the relationship between the inversed parameters and weather data is present.