The University of Science and Technology of China has achieved the highest precision continuous detection of wind fields to date

Professor Xue Xianghui’s team at the School of Earth and Space Sciences of the University of Science and Technology of China made a breakthrough in the development of a coherent wind measurement lidar system, achieving wind field detection with a spatial resolution of 3 meters and a time resolution of 0.1 seconds for the first time. It is reported that this is the world’s highest precision continuous detection of wind farms reported so far. The relevant results were published in the internationally renowned optical journal Optics Letters.

Package prototype of 500 3m wind measurement lidar .jpg

Wind measurement lidar package prototype Research group for the picture

Atmospheric wind field detection with meter-subsecond resolution is of great significance in terms of aerospace safety, high-value target support, and numerical weather forecasting, but continuous wind field observation with high spatio-temporal resolution is still a challenge for lidar. For example, in order to obtain wind field observations with 3 meters and 0.1 second spatio-temporal resolution, the detection sensitivity of existing lidar signals needs to be increased by more than 2 orders of magnitude.

In order to achieve the high-space-time resolution wind measurement lidar of “seeing far, seeing fine, measuring fast, and measuring accurately”, the team comprehensively optimized the lidar by laser light source, optical transceiver system, high-speed data acquisition circuit and data processing algorithm, and proposed a new inversion algorithm on the basis of time-frequency analysis and pulse coding, which greatly improved the accuracy and robustness of wind field inversion, and finally realized a set of nationally produced “product-level” test prototypes.

According to reports, the radar prototype has a working wavelength of 1550.1 nanometers, which has the characteristics of human eye safety, light equipment (40 kg of equipment), stable work, and strong environmental adaptability.

Through the field comparison test, the wind field observation of the radar prototype has a comparison error with the calibration equipment of less than 0.5 meters per second.

To further test the radar observation performance and environmental adaptability, the team measured the wind farm structure in the wake of the high-speed train at the high-speed rail station in Suzhou, Anhui Province. The radar worked continuously and stably for more than 100 hours unattended, obtained continuous observations of the high-speed rail wake of 350 km / h at a high spatio-temporal resolution of 3 meters and 0.1 seconds, and used lidar for the first time to capture the wind field structure similar to Von Carmen Vortex in the high-speed rail wake, which is highly consistent with the results of computational fluid dynamics simulations.

The reviewers concluded that “the observations were striking and impressive” and “the high-resolution results of continuous observations achieved for the first time so far”.

Liang Chen, a doctoral student at the School of Earth and Space Sciences, is the first author of the paper, and Associate Researcher Wang Chong and Professor Xue Xianghui are the co-corresponding authors of the paper. (Source: China Science Daily Wang Min)

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