Dual-beam laser radar wind field detection device and method

Abstract

The invention provides a dual-beam laser radar wind field detection device and method. The device comprises a first laser transmitting and receiving mechanism, a second laser transmitting and receiving mechanism, a master control unit, a collecting and processing unit and an operation display unit. The first laser emitting and receiving mechanism and the second laser emitting and receiving mechanism are installed on the same plane, and emitted laser beams are also on the same plane. The distance between laser emitting positions of the first and second laser emitting and receiving mechanisms is a, and an included angle between optical axes of laser beams emitted by the first and second laser emitting and receiving mechanisms is theta; the master control unit controls lasers and detectors of the two laser transmitting and receiving mechanisms and the collecting and processing unit to act according to the time sequence; and the collecting and processing unit is responsible for collecting and processing detector signals of the two laser transmitting and receiving mechanisms, and obtaining the direction and speed of the wind field according to the collected laser back scattering signal amplitude and the emitted laser energy value based on similarity calculation .

Description

technical field [0001] The invention relates to a dual-beam laser radar wind field detection device and method, belonging to the field of wind field detection. Background technique [0002] Atmospheric wind field is an important atmospheric physical parameter. Accurate observation of atmospheric wind field is of great significance to air pollution prevention and control, improving aerospace safety, military environment forecasting, improving climate research models, and improving the accuracy of long-term weather forecasts. As an active atmospheric remote sensing instrument, wind lidar has the advantages of high wind field measurement accuracy, high temporal and spatial resolution, and is not affected by ground clutter. It is very suitable for fast and accurate wind field measurement. [0003] Doppler wind detection lidar realizes wind field detection by measuring the Doppler frequency shift caused by atmospheric molecules and aerosol particles moving with the wind field to ...

AI Technical Summary

Problems solved by technology

Doppler coherent detection uses the echo signal and the local oscillator laser for optical mixing. The frequency of the difference frequency signal minus the initial frequency offset is the Doppler frequency shift caused by the moving particles. The coherence of the coherent detection of the laser The requirements are high, so the processing of optical devices is difficult, the cost is high, and the optical path is complicated

Doppler direct detection uses an optical discriminator or a spectrum analyzer to convert the optical frequency shift into a directly measurable optical power or a change in the spatial distribution of optical power. It requires high frequency stability of the laser and the system is complex.

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