Micro vibration sensor makes interstellar propagation "not miss the target"
it was learned from Tianjin University that Professor Li Xingfei's team applied MHD to micro angular vibration sensor, and made a breakthrough in solving the stable acquisition, tracking and aiming of long-distance laser beams through high bandwidth, low-noise micro angular vibration "signal pickup and feedback control, combined with inertial stabilization platform technology, It breaks through the foreign blockade on the key technology of sub micro radian angular vibration measurement, and fills the gap of on orbit measurement technology of space micro angular vibration in China. Recently, the MHD micro angular vibration sensor developed by the team officially became the space flight verification test project of the core device of China Academy of space technology
in the movie star wars and scalability, the dazzling laser amazed the audience. But in the real world, all kinds of angular vibration sources that cannot be distinguished by the naked eye directly interfere with the aiming and tracking of laser. Although the amplitudes of these vibration sources are mostly below submicro radians, it is enough to make a laser beam between the earth and the moon separate from the size range of the dart target area. It is the so-called difference of a millimetre, which is a thousand miles away
ordinary people's understanding of angles is measured by degrees. But in a more microscopic world, one degree equals 60 minutes, or 3600 seconds. Micro radian is about 0.2 arcseconds, while sub micro radian is smaller than micro radian. The micro angular vibration of space structure refers to the broadband high-frequency vibration of angular displacement of the sensitive axis of the payload, such as satellites and other spacecraft and the equipment it carries, ranging from 10 micro radians to micro radians. This vibration is generally caused by the motion or disturbance of the spacecraft body and its related loads. The environmental effect of micro vibration dynamics has small amplitude and high frequency, which will not have a significant impact on most spacecraft. However, high-resolution earth observation remote sensing satellites, deep space exploration remote sensing spacecraft, deep space laser communication satellites and other high-precision spacecraft have higher requirements for the accuracy and stability of attitude control. This micro vibration dynamic environmental effect will seriously affect the pointing accuracy and attitude stability of the high-precision spacecraft body and payload
magnetohydrodynamic micro angular vibration sensor has the characteristics of low noise, large bandwidth, small volume, light weight, long service life, impact resistance and so on. Compared with other existing attitude sensors, it is more suitable for space micro vibration measurement. It is the key sensitive element to realize deep space laser communication in the future and can further process cutting-edge technologies in various ways. Developed countries have also been blocking China's technology
facing the major national needs of precise sensing and control of spacecraft in orbit space motion, Professor Li Xingfei's team designed a sensor based on magnetohydrodynamic micro angular vibration that often leads to inaccurate measurement results, mastered the design method of a broadband inertial stabilization platform based on magnetohydrodynamic sensing, and independently developed a set of equipment including design simulation, processing and manufacturing, testing and inspection, It provides a powerful measurement data guarantee for high-precision spacecraft vibration modeling, breaks through the foreign blockade of relevant key technologies such as sub micro radian angular vibration measurement and control of on orbit spacecraft, so that China's sensor element noise and bandwidth indicators basically reach the international advanced level, and also lays a sensing and control foundation for China to carry out deep space laser communication, directional energy weapons and large-scale space laser applications in the future
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