China Science and Technology University successfully developed high-performance wind lidar

According to Xinhua News Agency reporter learned from the University of Science and Technology of China, the school's Dou Xiankang research group Xia Haiyun and Pan Jianwei's research group Zhang Qiang cooperated recently to realize the dual-frequency Doppler wind measurement based on superconducting nanowire single photon detector for the first time in the world. Lidar has significantly improved the usability and reliability, and can be operated on platforms such as airborne and spaceborne. The internationally renowned optical journal "Journal of Optics" recently published the results.

Wind-measuring Lidar has a wide range of social benefits, such as accurate atmospheric wind field data for atmospheric pollution traceability and diffusion prediction, aeronautical meteorological support, meteorological climatology research, wind power system management, and military applications. However, when shorter laser pulses are used to improve the range resolution of Doppler lidar, the coherent efficiency of traditional coherent detection lidar will decrease, and real-time data acquisition and processing are facing enormous challenges.

The new dual-frequency Doppler wind lidar, which was successfully developed by the research team members, uses a compact optical structure to achieve high system stability and improve practicality and reliability. The radar operates at 1548.1 nm, which allows the human eye to have the highest exposure power, optimal atmospheric transmission, and low solar and sky radiation background. At the same time, the optoelectronic integrated device is mature, no need for repeated calibration, and the module can be installed separately. Therefore, it is suitable for running on large temperature difference and strong vibration platforms such as airborne, shipboard and spaceborne.

In the laboratory, the system has a 10-day repeated measurement error of less than 0.2 m/sec. In the comparison test, the horizontal wind speed data measured by the lidar is compared with the data of the ultrasonic wind speed sensor, and the average errors of the wind speed and the wind direction are less than 0.1 m/sec and 1 degree, respectively. In the field test, a weak laser source (pulse energy of 50 microjoules) and a small telescope (caliber of 80 mm) were used to achieve an atmospheric wind of 2.7 km or less at a height resolution of 10 m and a time resolution of 10 seconds. Shear detection.