Under the condition of normal gravity, it is difficult to perceive weak changes of microscopic matter caused by material combustion. To meet the requirement of long-term microgravity environment, it is necessary to establish a combustion science experimental system in space station. For combustion experiment on orbit, a compact optical observation facility is designed in this paper. The facility bases on schlieren imaging, which is able to observe density distribution and flow-field change in combustion experiment. According to the characteristics of space condition, a highly reliable optical lens and mechanical structure are designed. The simulation experimental results show that our design is of high reliability, which is able to be used in complex condition of space combustion experiment.
High-speed aircraft is very important for space safety and scientific exploration. When aircraft flies in near space at high speed, thin atmosphere outside aircraft forms high-speed convection. For optical detection device, the convection will cause aero optical effect, which can seriously affect the detection range and sensitivity of remote sensing system. In order to discuss the impact of aero optical effect for infrared detection device, we study the formation mechanism of aero optical effect and analyze the model of radiation transmission. Through static window heating test and dynamic flow field wind tunnel test, we verify the thermal radiation influence of quartz window and high-speed flow filed for short wave infrared detection system. The experimental results show that for 900nm-1700nm short wave infrared imaging system, short wave infrared signal of target can filter through quartz window below its melting point temperature. By accurately controlling exposure time, the thermal radiation effect of high-speed flow field can be weakened, and the target contrast can be improved for infrared detection system.
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