Anemometry lidar device

Abstract

The invention discloses an anemometry lidar device and which includes a seed laser device used for producing linear polarization continuous lasers; a beam splitter used for dividing narrow linewidth continuous lasers produced by the seed laser into two parts, wherein a part is output as seed lights from a first output terminal, and the other part is output as local oscillator lights from a secondoutput terminal; an optical transceiver antenna used for transmitting the seed lights from the second terminal to the atmosphere and receive echo signals; an adjustable light delay line used for delaying the local oscillator lights; a signal acquisition and processing module used for estimating wind speed by using the delayed local oscillator lights and the echo signals, thereby obtaining radial wind speed in the current scanning direction. Through the above method, the anemometry lidar device is capable of significantly reducing the requirement for the seed laser, reducing the cost of lidar system, and reducing the purchase difficulty of the seed laser.

Description

technical field [0001] The application relates to the field of radar, in particular to a wind-measuring lidar device. Background technique [0002] Atmospheric wind field information is an important resource. Accurate atmospheric wind field measurement can improve the utilization rate of wind energy in the field of renewable energy, the accuracy of climate model establishment, and enhance the safety of aircraft when taking off and landing. Aerospace, climate and meteorology, military and other fields have very important research value. Compared with traditional wind measuring instruments, wind measuring lidar has the advantages of higher temporal and spatial resolution, good mobile portability, and quick measurement of wind field information, and has become one of the important means of wind field measurement. [0003] Wind lidar can be divided into direct detection type and coherent detection type according to the detection method. Compared with direct detection, the devic...

AI Technical Summary

Problems solved by technology

Since the Doppler frequency shift brought by the wind field information is less than 102 MHz, and the frequency of the 1.55 μm laser is on the order of 108 MHz, the general LiDAR system has little effect on the spectral linewidth, phase noise, and frequency stability of the seed laser. There are extremely high requirements, and high-performance seed lasers lead to a substantial increase in the cost of the lidar system, and also increase the difficulty of purchasing high-performance seed lasers

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