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Chinese scientists have made breakthroughs in the development of lidar systems

The reporter learned that xuexianghui, a professor at the school of earth and Space Sciences of the University of science and technology of China, has achieved wind field detection with a spatial resolution of 3 meters and a temporal resolution of 0.1 seconds for the first time in the development of a coherent wind lidar system.

It is understood that the detection of atmospheric wind field with meter sub second resolution is of great significance in aerospace safety, high-value target protection, numerical weather forecasting, etc., but the continuous wind field observation with high space-time resolution is still a challenge to lidar. According to the introduction, the working wavelength of the radar prototype of Xue Xianghui’s team is 1550.1 nm. Through the field comparison test, the comparison error between the wind field observation results of the radar prototype and the calibration equipment is less than 0.5 meters per second.

In order to further test the radar observation performance and environmental adaptability, Xue Xianghui’s team measured the wind field structure in the wake of high-speed trains at Suzhou high-speed railway station in Anhui Province. The radar worked continuously and stably for more than 100 hours under unattended conditions, and obtained continuous observations of the high-speed rail wake at 350 kilometers per hour with a high spatial-temporal resolution of 3 meters and 0.1 seconds. For the first time, the laser radar was used to capture the wind field structure similar to the von Karman vortex street in the high-speed rail wake, which was highly consistent with the computational fluid dynamics simulation results. Relevant achievements were published in the international optical journal optical express. Reviewers believe that”the observation results are eye-catching and impressive” and”the high-resolution results of continuous observation have been achieved for the first time so far”. Liang Chen, a doctoral candidate from the school of earth and Space Sciences of the University of science and technology of China, is the first author of the paper, and associate researcher Wang Chong and Professor Xue Xianghui are the co correspondents of the paper.