Abstract
In order to ensure the imaging performance of the aerial optoelectronic platform system in low temperature environment, an active-passive combined thermal control technology was studied. A thermal control finite element model of the aerial optoelectronic platform was established. Additionally, thermal control simulation analysis and experiments under extreme conditions were carried out respectively. The simulation and experimental results showed that the temperature level of the primary mirror is improved above 25 °C by the proposed thermal control technology effectively, meanwhile the temperature gradient of the primary and secondary mirrors are less than 5 °C. The successful implementation of this active-passive combined thermal control technology provides a technical support for the precision thermal control of aerial optoelectronic platforms.
Highlights
As one of the information acquisition means, aerial optoelectronic platform has the advantages of flexibility, real-time, and detailed information
The purpose of thermal control design is to determine which thermal control measures are taken in specific part of the aerial optoelectronic platform, how to allocate active thermal control resources, and how to control the internal and external heat exchange processes of the system, so that the temperature level and temperature gradient can meet the temperature index requirements in order to guarantee image quality
Aiming at the special working environment of the aerial optoelectronic platform, in view of the initial temperature uncertainty, the special characteristics of the rapid change of the working environment temperature and the thermal stability required for the long focal length loads, effective thermal control measures are needed
Summary
As one of the information acquisition means, aerial optoelectronic platform has the advantages of flexibility, real-time, and detailed information. Liu Fuhe et al [14] analyze the different impacts of temperature changes on the imaging resolution, and proposed an active thermal control method to improve the imaging quality of the sensor in a low-temperature environment. Due to the usage of a Cassegrain-reflecting objective lens, using active thermal control method with specific thermal control strategy to ensure the imaging quality of primary and secondary mirror is the focus. On the basis of an aerial optoelectronic platform, the thermal control index was analyzed to ensure high-resolution image quality. High-resolution camera thermal control index is very demanding which must be carefully analyzed for the entire heat flow environment outside the aerial optoelectronic platform. The analysis of solar radiation, infrared radiation of the earth, and the external heat flow reflected by the earth to sunlight is illustrated as follows
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