Chinese scholars successfully developed high performance wind laser radar

The reporter learned from the University of Science and Technology of China that Xia Xiangyun, a project group led by Dou Xiankang, and Zhang Jianqiang, a project group led by Pan Jianwei, recently realized the dual-frequency Doppler wind lidar based on superconducting nanowire single-photon detectors for the first time in the world. Improve the practicality and reliability, in airborne, spaceborne and other platforms to run. The internationally renowned optical journal "Optics" has published the results.

Wind laser radar has extensive social benefits. For example, accurate atmospheric wind field data can be applied to air pollution traceability and diffusion prediction, aviation weather protection, meteorological climatology, wind power system management and military applications. However, when using shorter laser pulses to improve the range resolution of Doppler Lidar, the coherence efficiency of the traditional coherent Lidar will decrease, and both real-time data acquisition and processing are facing great challenges.

The members of the research team recently successfully developed a new dual-frequency Doppler wind lidar with a compact optical structure to achieve high stability of the system and to improve its practicability and reliability. The radar operates at 1548.1 nm, which allows the human eye with infrared wavelengths to maximize exposure power, optimal atmospheric transmittance, and low sun and sky radiation backgrounds. At the same time photoelectric integrated devices mature, do not need repeated calibration, the module can be installed separately. Therefore, suitable for airborne, shipborne, spaceborne and other large temperature difference, strong vibration platform to run.

In the laboratory, the system 10-day repeated measurement error is less than 0.2 m / s. In the comparison test, the horizontal wind speed data measured by lidar were compared with the data of ultrasonic wind speed sensor. The average error of wind speed and wind direction were less than 0.1 m / s and 1 degree respectively. In field experiments, a weak laser light source (pulse energy of 50 micro-focal) and a small telescope (80-mm diameter) were used to achieve a wind of less than 2.7 km at a height resolution of 10 meters and a temporal resolution of 10 seconds Shear detection.

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