Aerothermal radiation transfer calculation method from the dome to the detector based on reverse ray tracing

The effect of aerothermal radiation of the optic dome on the signal-to-noise ratio of infrared detection system is becoming a crucial issue when the temperature of optic dome is increases in the high speed incoming flow. The method to calculate the radiated power transfer from the whole dome to the unit of the detector through the optic system according to the inverse ray tracing was proposed. The gradient temperature distribution of the dome surface and the attenuation coefficient of the dome material with the wavelength and the temperature were taken into considered in dome's thermal radiation calculation. According to the mothed, the simulation software was developed and used to analyze the effect about the radiated power transfer from dome of the example optic system to the detector. Simulation results show that the dome with high temperature generates more noise radiated power on the focus plane, to choose reasonable wavelength band and thickness of the dome is useful to increase the signal-to-noise ratio.