Direct wind lidar based on difference stimulated Brillouin gain effect

A wind-measuring lidar, stimulated Brillouin technology, applied in measurement devices, ICT adaptation, electromagnetic wave re-radiation, etc., can solve problems such as increasing system measurement errors, and achieve high detection accuracy, low cost, and reduced effect of error

Active Publication Date: 2016-11-23
UNIV OF SCI & TECH OF CHINA
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However, the above scheme will increa

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  • Direct wind lidar based on difference stimulated Brillouin gain effect
  • Direct wind lidar based on difference stimulated Brillouin gain effect
  • Direct wind lidar based on difference stimulated Brillouin gain effect

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[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0025] Stimulated Brillouin scattering is a nonlinear optical phenomenon. In fiber optics, its process can be classically described as a nonlinear effect excited by laser pump waves and Stokes waves through acoustic waves. The pump wave generates an acoustic wave in the medium by the electrostrictive effect, which in turn modulates the refractive index of the medium. The refractive index grating induced by the pump wave scatters the pump wave throu...

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Abstract

The invention discloses a direct wind lidar based on the difference stimulated Brillouin gain effect. In the scheme, a continuous laser device is adopted as a light source, after being modulated through a phase or intensity modulator, carrier frequency light of the laser device is used as detection light, and light with frequency at the two sides is used as double-frequency pump light for generating stimulated Brillouin scattering in optical fiber. Atmosphere echo signals and the double-frequency pump light are transmitted oppositely in the optical fiber, the signals carrying Doppler shift generate energy change due to stimulated Brillouin scattering, energy change is detected by a detector, wind speed information of the atmosphere echo signals can be obtained, and a frequency discrimination device is formed by the system. As the frequency discrimination device is used, the laser outgoing frequency is fixed to the middle point of the spacing distance between an absorption peak and a gain peak on a frequency spectrum, and laser frequency does not need to be locked. The lidar system has the advantages of being stable, high in measurement accuracy, low in cost, simple and compact in structure and the like.

Description

technical field [0001] The invention relates to the field of wind measuring laser radar, in particular to a direct wind measuring laser radar based on differential stimulated Brillouin gain effect. Background technique [0002] Wind lidar is of great significance to improve the accuracy of long-term weather forecasts, improve climate research models, and improve military environment forecasts. Therefore, the measurement of atmospheric wind field has received more and more attention. Organizations such as the International Civil Aviation Agency, the World Meteorological Organization, and aerospace research institutions in various countries are actively carrying out research and development of wind field detection systems. [0003] Doppler wind lidar can be divided into coherent detection and direct detection according to different detection principles. Coherent detection detects wind speed through the coherence of laser atmospheric echo signal and local oscillator laser. Di...

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Application Information

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IPC IPC(8): G01S17/95
CPCG01S17/95Y02A90/10
Inventor 夏海云赵力杰上官明佳窦贤康
Owner UNIV OF SCI & TECH OF CHINA
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