The reporter learned from Tianjin University that the team of Professor Li Xingfei of the school applied magnetohydrodynamics to micro-angular vibration sensing, through high-bandwidth, low-noise micro-angle vibration signal pick-up and feedback control, combined with inertial stabilization platform technology to solve the long The breakthrough in laser beam stabilization, tracking and aiming has broken through the blockade of foreign key technologies for sub-micro-radius angular vibration measurement, filling the blank of domestic space micro-angle vibration on-orbit measurement technology. Recently, the MHD micro-angle vibration sensor developed by the team officially became the core device space flight verification test project of China Academy of Space Technology.
In the movie "Star Wars," the dazzling laser surprised the audience. However, in the real world, various angular vibration sources that are indistinguishable to the naked eye directly interfere with the aiming and tracking of the laser. Although the amplitude of these vibration sources is mostly below the sub-microradius, it is enough to make a laser beam off the surface of the dart target in the range of the earth and the moon, which is called the difference of a thousand miles.
Ordinary people's understanding of angles is measured by degrees. But in a more microscopic world, 1 degree is equal to 60 centimeters, or 3600 centimeters. The microradians are approximately 0.2 arc seconds, while the submicroradians are smaller than the microradians. The spatial structure micro-angle vibration refers to the wide-angle high-frequency vibration of the angular displacement of the sensitive axis of the spacecraft such as satellites and the spacecraft it carries from 10 micro-radians to 10-2 micro-arc. This vibration is generally caused by motion or disturbance of the spacecraft body and its associated loads. The micro-vibration mechanical environment effect has small amplitude and high frequency, and will not have a significant impact on most spacecraft. However, high-precision geodetic remote sensing satellites, deep space exploration and remote sensing spacecraft, deep space laser communication satellites and other high-precision spacecraft require higher accuracy and stability of attitude control, and this micro-vibration mechanical environment effect will be seriously affected. High-precision spacecraft body and the pointing accuracy and attitude stability of the payload.
The magnetohydrodynamic micro-angle vibration sensor combines low noise, large bandwidth, small size, light weight, long life and shock resistance. It is more suitable for space micro-vibration measurement than other existing attitude sensors. The key sensitive components of cutting-edge technologies such as laser communication have also been technically blocked by developed countries.
Professor Li Xingfei's team designed a micro-angular vibration sensor based on magnetohydrodynamics for the major national needs of spacecraft in-orbit space motion precision sensing and control, and mastered the design method of broadband inertial stabilization platform based on magnetohydrodynamics sensing. Independently developed a set of equipment including design simulation, processing and manufacturing, test and inspection, providing powerful measurement data guarantee for high-precision spacecraft vibration modeling, breaking through the measurement and control of submicro-radial angle vibration of on-orbit spacecraft abroad. The related key technology blockade has made China's sensor component noise and bandwidth indicators basically reach the international advanced level, and also lays the foundation for sensing and control in the future scientific fields such as deep space laser communication, directed energy weapons and large-scale space laser applications in China.
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